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1. Shard Calculation

Query:

Response:

Calculated Shard: 33 (from laksa116)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa033.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://kitronik.co.uk/blogs/resources/how-to-calculate-resistors-in-series-and-parallel\')), getAhrefsUnparsedNoserviceFromURL(\'https://kitronik.co.uk/blogs/resources/how-to-calculate-resistors-in-series-and-parallel\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/kitronik.co.uk\/blogs\/resources\/how-to-calculate-resistors-in-series-and-parallel","crawl_time":1776247304,"first_indexed_time":1591314505,"http_code":200,"src_unparsed":"uk,co,kitronik!\/blogs\/resources\/how-to-calculate-resistors-in-series-and-parallel s443","src_root_hash":"15239296867089290233","history_drop_reason":null,"meta_title":"How to Calculate Resistors in Series and Parallel – Kitronik","meta_descriptions":[],"attrs_boilerpipe_text":"When\nresistors\nare connected one after each other this is called connecting in series. This is shown below.\nTo calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula:\nRtotal = R1 + R2 +R3\nand so on. Example: To calculate the total resistance for these three resistors in series.\n*Rtotal = R1 + R2 + R3* *= 100 + 82 + 1 Ohms* *= 183 Ohms *\nTask 1:\nCalculate the total resistance of the following resistor in series.\nRtotal\n = _______________\n = _______________\nRtotal\n = _______________\n = _______________\nRtotal\n = _______________\n = _______________\nResistors in Parallel\nWhen resistors are connected across each other (side by side) this is called connecting in parallel. This is shown below.\nTwo Resistors in Parallel\nTo calculate the total overall resistance of a of two resistors connected in this way you can use the following formula:\nExample: To calculate the total resistance for these two resistors in parallel.\nTask 2:\nCalculate the total resistance of the following resistor in parallel.\nThree or more resistors in parallel\nTo calculate the total overall resistance of a number of three or more resistors connected in this way you can use the following formula:\nExample: To calculate the total resistance for these three resistors in parallel\nTask 3:\nCalculate the total resistance of the following resistor in parallel.\nAnswers\nTask 1\n1 = 1492 Ohms 2 = 2242 Ohms 3 = 4847 Ohms\nTask 2\n1 = 5 Ohms 2 = 9.57 Ohms 3 = 248.12 Ohms\nTask 3\n1 = 5.95 Ohms 2 = 23.76 Ohms   Download a pdf version of this page\nhere\nLearn more about the author","attrs_markdown":"[Skip to content](https:\/\/kitronik.co.uk\/blogs\/resources\/how-to-calculate-resistors-in-series-and-parallel#primary)\n\n[![Kitronik logo](https:\/\/kitronik.co.uk\/wp-content\/uploads\/2024\/02\/cropped-kitronik_logo_grey_with_green_dots-300px-scaled.png)](https:\/\/kitronik.co.uk\/)\n\n[Kitronik](https:\/\/kitronik.co.uk\/)\n\nSearch\n\n[0](https:\/\/kitronik.co.uk\/cart \"View your shopping cart\")\n\nYour Cart\n\n- [Project Kits](https:\/\/kitronik.co.uk\/collections\/electronic-project-kits)\n  - 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[Gift ideas](https:\/\/kitronik.co.uk\/collections\/gift-ideas)\n  - [Save\\!](https:\/\/kitronik.co.uk\/collections\/clearance-special-offers)\n\nSearch\n\n# How to Calculate Resistors in Series and Parallel\n[January 14, 2014November 13, 2025](https:\/\/kitronik.co.uk\/blogs\/resources\/how-to-calculate-resistors-in-series-and-parallel)\n\n[Mark Donnison](https:\/\/kitronik.co.uk\/blogs\/author\/markdonnison)\n\n![](https:\/\/kitronik.co.uk\/wp-content\/uploads\/2024\/02\/ResistorsInParallel.jpg)\n\n## Resistors in Series\nWhen [resistors](https:\/\/kitronik.co.uk\/collections\/resistors-accessories\/Resistors) are connected one after each other this is called connecting in series. This is shown below. [![resistors\\_in\\_series\\_1](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_1.png)](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_1.png) To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula: *Rtotal = R1 + R2 +R3* and so on. Example: To calculate the total resistance for these three resistors in series.\n\n|   |   |\n|---|---|\n| ![resistors\\_in\\_series\\_2](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C\/svg%3E) | \\*Rtotal = R1 + R2 + R3\\* \\*= 100 + 82 + 1 Ohms\\* \\*= 183 Ohms \\* |\n***\n### Task 1:\nCalculate the total resistance of the following resistor in series.\n\n|   |   |   |\n|---|---|---|\n| ![resistors\\_in\\_series\\_3](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C\/svg%3E) | Rtotal | \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |\n| \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |   |   |\n\n|   |   |   |\n|---|---|---|\n| ![resistors\\_in\\_series\\_4](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C\/svg%3E) | Rtotal | \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |\n| \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |   |   |\n\n|   |   |   |\n|---|---|---|\n| ![resistors\\_in\\_series\\_5](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C\/svg%3E) | Rtotal | \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |\n| \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |   |   |\n###\n### Resistors in Parallel\nWhen resistors are connected across each other (side by side) this is called connecting in parallel. This is shown below. ![resistors\\_in\\_series\\_6](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='400'%20height='113'%20viewBox='0%200%20400%20113'%3E%3C\/svg%3E)\n\n###\n### Two Resistors in Parallel\n|   |   |\n|---|---|\n| To calculate the total overall resistance of a of two resistors connected in this way you can use the following formula: | ![resistors\\_in\\_series\\_7](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='167'%20height='39'%20viewBox='0%200%20167%2039'%3E%3C\/svg%3E) |\n\nExample: To calculate the total resistance for these two resistors in parallel.\n\n![resistors\\_in\\_series\\_8](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='600'%20height='89'%20viewBox='0%200%20600%2089'%3E%3C\/svg%3E)\n***\n### Task 2:\nCalculate the total resistance of the following resistor in parallel. ![resistors\\_in\\_series\\_9](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='600'%20height='304'%20viewBox='0%200%20600%20304'%3E%3C\/svg%3E)\n\n###\n### Three or more resistors in parallel\n![resistors\\_in\\_series\\_10](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='400'%20height='127'%20viewBox='0%200%20400%20127'%3E%3C\/svg%3E) To calculate the total overall resistance of a number of three or more resistors connected in this way you can use the following formula: [![resistors\\_in\\_series\\_11](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='262'%20height='65'%20viewBox='0%200%20262%2065'%3E%3C\/svg%3E)](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_111.png) Example: To calculate the total resistance for these three resistors in parallel ![resistors\\_in\\_series\\_12](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='587'%20height='143'%20viewBox='0%200%20587%20143'%3E%3C\/svg%3E)\n***\n### Task 3:\nCalculate the total resistance of the following resistor in parallel. ![resistors\\_in\\_series\\_13](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='600'%20height='278'%20viewBox='0%200%20600%20278'%3E%3C\/svg%3E)\n***\n### Answers\n### Task 1\n1 = 1492 Ohms 2 = 2242 Ohms 3 = 4847 Ohms\n\n### Task 2\n1 = 5 Ohms 2 = 9.57 Ohms 3 = 248.12 Ohms\n\n### Task 3\n1 = 5.95 Ohms 2 = 23.76 Ohms Download a pdf version of this page [here](https:\/\/resources.kitronik.co.uk\/pdf\/How_to_calculate_resistors_in_series_and_parallel.pdf \"How_to_calculate_resistors_in_series_and_parallel.pdf\") ![pdf\\_icon.gif](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='25'%20height='24'%20viewBox='0%200%2025%2024'%3E%3C\/svg%3E) Learn more about the author [read 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This is shown below. [![resistors\\_in\\_series\\_1](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_1.png)](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_1.png) To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula: *Rtotal = R1 + R2 +R3* and so on. Example: To calculate the total resistance for these three resistors in series.\n\n|   |   |\n|---|---|\n| ![resistors\\_in\\_series\\_2](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_2.png) | \\*Rtotal = R1 + R2 + R3\\* \\*= 100 + 82 + 1 Ohms\\* \\*= 183 Ohms \\* |\n***\n### Task 1:\nCalculate the total resistance of the following resistor in series.\n\n|   |   |   |\n|---|---|---|\n| ![resistors\\_in\\_series\\_3](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_3.png) | Rtotal | \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |\n| \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |   |   |\n\n|   |   |   |\n|---|---|---|\n| ![resistors\\_in\\_series\\_4](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_4.png) | Rtotal | \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |\n| \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |   |   |\n\n|   |   |   |\n|---|---|---|\n| ![resistors\\_in\\_series\\_5](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_5.png) | Rtotal | \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |\n| \\= \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ |   |   |\n### Resistors in Parallel\nWhen resistors are connected across each other (side by side) this is called connecting in parallel. This is shown below. ![resistors\\_in\\_series\\_6](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_6.png)\n\n### Two Resistors in Parallel\n|   |   |\n|---|---|\n| To calculate the total overall resistance of a of two resistors connected in this way you can use the following formula: | ![resistors\\_in\\_series\\_7](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_7.png) |\n\nExample: To calculate the total resistance for these two resistors in parallel.\n\n![resistors\\_in\\_series\\_8](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_8.png)\n***\n### Task 2:\nCalculate the total resistance of the following resistor in parallel. ![resistors\\_in\\_series\\_9](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_9.png)\n\n### Three or more resistors in parallel\n![resistors\\_in\\_series\\_10](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_10.png) To calculate the total overall resistance of a number of three or more resistors connected in this way you can use the following formula: [![resistors\\_in\\_series\\_11](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_111.png)](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_111.png) Example: To calculate the total resistance for these three resistors in parallel ![resistors\\_in\\_series\\_12](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_12.png)\n***\n### Task 3:\nCalculate the total resistance of the following resistor in parallel. ![resistors\\_in\\_series\\_13](https:\/\/resources.kitronik.co.uk\/images\/blogs\/2014\/01\/resistors_in_series_13.png)\n***\n### Answers\n### Task 1\n1 = 1492 Ohms 2 = 2242 Ohms 3 = 4847 Ohms\n\n### Task 2\n1 = 5 Ohms 2 = 9.57 Ohms 3 = 248.12 Ohms\n\n### Task 3\n1 = 5.95 Ohms 2 = 23.76 Ohms Download a pdf version of this page [here](https:\/\/resources.kitronik.co.uk\/pdf\/How_to_calculate_resistors_in_series_and_parallel.pdf \"How_to_calculate_resistors_in_series_and_parallel.pdf\") ![pdf\\_icon.gif](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20width='25'%20height='24'%20viewBox='0%200%2025%2024'%3E%3C\/svg%3E) Learn more about the author","meta_canonical":null}

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Boilerpipe Text	When resistors are connected one after each other this is called connecting in series. This is shown below. To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula: Rtotal = R1 + R2 +R3 and so on. Example: To calculate the total resistance for these three resistors in series. Rtotal = R1 + R2 + R3 = 100 + 82 + 1 Ohms = 183 Ohms Task 1: Calculate the total resistance of the following resistor in series. Rtotal = _______________ = _______________ Rtotal = _______________ = _______________ Rtotal = _______________ = _______________ Resistors in Parallel When resistors are connected across each other (side by side) this is called connecting in parallel. This is shown below. Two Resistors in Parallel To calculate the total overall resistance of a of two resistors connected in this way you can use the following formula: Example: To calculate the total resistance for these two resistors in parallel. Task 2: Calculate the total resistance of the following resistor in parallel. Three or more resistors in parallel To calculate the total overall resistance of a number of three or more resistors connected in this way you can use the following formula: Example: To calculate the total resistance for these three resistors in parallel Task 3: Calculate the total resistance of the following resistor in parallel. Answers Task 1 1 = 1492 Ohms 2 = 2242 Ohms 3 = 4847 Ohms Task 2 1 = 5 Ohms 2 = 9.57 Ohms 3 = 248.12 Ohms Task 3 1 = 5.95 Ohms 2 = 23.76 Ohms Download a pdf version of this page here Learn more about the author
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This is shown below. [![resistors\_in\_series\_1](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_1.png)](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_1.png) To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula: Rtotal = R1 + R2 +R3 and so on. Example: To calculate the total resistance for these three resistors in series. \| \| \| \|---\|---\| \| ![resistors\_in\_series\_2](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C/svg%3E) \| \Rtotal = R1 + R2 + R3\ \= 100 + 82 + 1 Ohms\ \= 183 Ohms \ \| * ### Task 1: Calculate the total resistance of the following resistor in series. \| \| \| \| \|---\|---\|---\| \| ![resistors\_in\_series\_3](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C/svg%3E) \| Rtotal \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \| \| \| \| \| \|---\|---\|---\| \| ![resistors\_in\_series\_4](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C/svg%3E) \| Rtotal \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \| \| \| \| \| \|---\|---\|---\| \| ![resistors\_in\_series\_5](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='400'%20height='55'%20viewBox='0%200%20400%2055'%3E%3C/svg%3E) \| Rtotal \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \| ### ### Resistors in Parallel When resistors are connected across each other (side by side) this is called connecting in parallel. This is shown below. ![resistors\_in\_series\_6](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='400'%20height='113'%20viewBox='0%200%20400%20113'%3E%3C/svg%3E) ### ### Two Resistors in Parallel \| \| \| \|---\|---\| \| To calculate the total overall resistance of a of two resistors connected in this way you can use the following formula: \| ![resistors\_in\_series\_7](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='167'%20height='39'%20viewBox='0%200%20167%2039'%3E%3C/svg%3E) \| Example: To calculate the total resistance for these two resistors in parallel. ![resistors\_in\_series\_8](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='600'%20height='89'%20viewBox='0%200%20600%2089'%3E%3C/svg%3E) * ### Task 2: Calculate the total resistance of the following resistor in parallel. ![resistors\_in\_series\_9](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='600'%20height='304'%20viewBox='0%200%20600%20304'%3E%3C/svg%3E) ### ### Three or more resistors in parallel ![resistors\_in\_series\_10](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='400'%20height='127'%20viewBox='0%200%20400%20127'%3E%3C/svg%3E) To calculate the total overall resistance of a number of three or more resistors connected in this way you can use the following formula: [![resistors\_in\_series\_11](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='262'%20height='65'%20viewBox='0%200%20262%2065'%3E%3C/svg%3E)](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_111.png) Example: To calculate the total resistance for these three resistors in parallel ![resistors\_in\_series\_12](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='587'%20height='143'%20viewBox='0%200%20587%20143'%3E%3C/svg%3E) * ### Task 3: Calculate the total resistance of the following resistor in parallel. ![resistors\_in\_series\_13](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='600'%20height='278'%20viewBox='0%200%20600%20278'%3E%3C/svg%3E) * ### Answers ### Task 1 1 = 1492 Ohms 2 = 2242 Ohms 3 = 4847 Ohms ### Task 2 1 = 5 Ohms 2 = 9.57 Ohms 3 = 248.12 Ohms ### Task 3 1 = 5.95 Ohms 2 = 23.76 Ohms Download a pdf version of this page [here](https://resources.kitronik.co.uk/pdf/How_to_calculate_resistors_in_series_and_parallel.pdf "How_to_calculate_resistors_in_series_and_parallel.pdf") ![pdf\_icon.gif](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='25'%20height='24'%20viewBox='0%200%2025%2024'%3E%3C/svg%3E) Learn more about the author [read more »](https://kitronik.co.uk/pages/geoff-hampson) SHARE: ## Post navigation [Previous: How To Calculate And Understand Resistor Values](https://kitronik.co.uk/blogs/resources/how-to-calculate-and-understand-resistor-values) [Next: How To Use Capacitors](https://kitronik.co.uk/blogs/resources/how-to-use-capacitors) ### Leave a Reply [Cancel reply](https://kitronik.co.uk/blogs/resources/how-to-calculate-resistors-in-series-and-parallel?srsltid=AfmBOorfYLz5pCsNHtJMyryCQL3RESLm4qXo-SANFUdRHNTFxtqoLtTb#respond) ## Kitronik Newsletter Sign up now to be the first to know about the latest products and resources\! 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Readable Markdown	When [resistors](https://kitronik.co.uk/collections/resistors-accessories/Resistors) are connected one after each other this is called connecting in series. This is shown below. [![resistors\_in\_series\_1](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_1.png)](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_1.png) To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula: Rtotal = R1 + R2 +R3 and so on. Example: To calculate the total resistance for these three resistors in series. \| \| \| \|---\|---\| \| ![resistors\_in\_series\_2](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_2.png) \| \Rtotal = R1 + R2 + R3\ \= 100 + 82 + 1 Ohms\ \= 183 Ohms \ \| * ### Task 1: Calculate the total resistance of the following resistor in series. \| \| \| \| \|---\|---\|---\| \| ![resistors\_in\_series\_3](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_3.png) \| Rtotal \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \| \| \| \| \| \|---\|---\|---\| \| ![resistors\_in\_series\_4](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_4.png) \| Rtotal \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \| \| \| \| \| \|---\|---\|---\| \| ![resistors\_in\_series\_5](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_5.png) \| Rtotal \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \| \| \| ### Resistors in Parallel When resistors are connected across each other (side by side) this is called connecting in parallel. This is shown below. ![resistors\_in\_series\_6](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_6.png) ### Two Resistors in Parallel \| \| \| \|---\|---\| \| To calculate the total overall resistance of a of two resistors connected in this way you can use the following formula: \| ![resistors\_in\_series\_7](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_7.png) \| Example: To calculate the total resistance for these two resistors in parallel. ![resistors\_in\_series\_8](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_8.png) * ### Task 2: Calculate the total resistance of the following resistor in parallel. ![resistors\_in\_series\_9](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_9.png) ### Three or more resistors in parallel ![resistors\_in\_series\_10](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_10.png) To calculate the total overall resistance of a number of three or more resistors connected in this way you can use the following formula: [![resistors\_in\_series\_11](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_111.png)](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_111.png) Example: To calculate the total resistance for these three resistors in parallel ![resistors\_in\_series\_12](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_12.png) * ### Task 3: Calculate the total resistance of the following resistor in parallel. ![resistors\_in\_series\_13](https://resources.kitronik.co.uk/images/blogs/2014/01/resistors_in_series_13.png) * ### Answers ### Task 1 1 = 1492 Ohms 2 = 2242 Ohms 3 = 4847 Ohms ### Task 2 1 = 5 Ohms 2 = 9.57 Ohms 3 = 248.12 Ohms ### Task 3 1 = 5.95 Ohms 2 = 23.76 Ohms Download a pdf version of this page [here](https://resources.kitronik.co.uk/pdf/How_to_calculate_resistors_in_series_and_parallel.pdf "How_to_calculate_resistors_in_series_and_parallel.pdf") ![pdf\_icon.gif](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='25'%20height='24'%20viewBox='0%200%2025%2024'%3E%3C/svg%3E) Learn more about the author
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