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Electronic circuits and components * Course Index * Introduction * About the Author * About this Course * Feedback * Course Navigation * How to use this Course * TINA * Locktronics Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity * Electronic Principles * Electrical Circuits * Alternating Current * Assessment: Fundamentals Passive Components * Introduction: Passive Components * Resistors ## Resistor Specifications ## Examples: Resistor Specifications ## Preferred Values: Resistors ## Resistor Colour Code ## Examples: Resistor Colour Code Test ## BS1852 Resistor Coding ## Examples: BS1852 Resistor Coding ## Measuring Resistance ## Resistor Symbols ## Resistor Construction ## Resistors in Series ## Worksheet: Resistors in Series ## Resistors in Parallel ## Worksheet: Resistors in Parallel ## Resistance and Temperature ## Examples: Resistance and Temperature ## Positive Temperature Coefficient ## Negative Temperature Coefficient ## Thermistors ## Light Dependent Resistors * Capacitors * Inductors * Transformers * Batteries, Fuses, Lamps and Switches * Assessment: Passive Components Semiconductors * Introduction: Semiconductors * Diodes * Transistors * Logic Gates * Assessment: Semiconductors Passive Circuits * Introduction: Passive Circuits * Series and Parallel Connections * Kirchoff's Laws * Potential and Current Dividers * Passive Time Variant Circuits * Assessment: Passive Circuits Active Circuits * Introduction: Active Circuits * Power Supply Circuits * Operational Amplifier Circuits * Transistor Amplifier Circuits * 555 Timer Circuits * Assessment: Active Circuits Parts Gallery * Introduction: Parts Gallery * Passive Component Images * Semiconductor Images * Other Images * Quizzes |
(:Summary:Contains the 'action' links (like Browse, Edit, History, etc.), placed at the top of the page, see site page actions:) (:comment This page can be somewhat complex to figure out the first time you see it. Its contents are documented at PmWiki.SitePageActions if you need help. :) * Print (:comment (:if group Site,SiteAdmin,Cookbook,Profiles,PmWiki*:) (:comment delete if and ifend to enable backlinks:) * %item rel=nofollow class=backlinks accesskey='$[ak_backlinks]'% [[{*$Name}?action=search&q=link={*$FullName} | $[Backlinks] ]] (:ifend:) :) * Login Resistors in Parallel<^< Worksheet: Resistors in Series | Course Index | Worksheet: Resistors in Parallel >^>(:nl:) When two resistors are connected in parallel, the same voltage appears across each of them and the effective resistance of the circuit will always be less than any one of the two resistors taken alone. The effective resistance, R, of a circuit with two resistors, R'_1_' and R'_2_', connected in parallel is given by: 1 / R = 1 / R'_1_' + 1 / R'_2_' Similarly, where three resistors (R'_1_', R'_2_', and R'_3_') are connected in parallel, the effective resistance of the combined circuit will be given by: 1 / R = 1 / R'_1_' + 1 / R'_2_' + 1 / R'_3_' In the case of two resistors, the formula can be more conveniently re-arranged as follows: R = (R'_1_' x R'_2_') / (R'_1_' + R'_2_') This can be remembered as "product over sum". (:nl:)(:table style="clear:both":)
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