# Series And Parallel Circuits - Electronics

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Series and ParallelCircuitsHow to Simplify to FindTotal Resistance, Current andVoltage

Series Circuits Series Circuits are the simplest to work with. Here we have three resistors of different resistances.They share a single connection point. When addedtogether the total resistance is 90-Ohms.

Parallel Circuits A parallel circuit is shown here and it has TWOcommon connection points with another component.In this case another resistor. We cannot add thevalues of each resistor together like we can in theprevious series circuit. So what do we need to do?

Calculating Total Resistanceof a Parallel CircuitTwo methods can be used to calculate the totalresistance of the parallel circuit. They are theProduct Over Sum equation or the ReciprocalFormula.(R1 x R2)Product Over Sum is RT (R1 R2)Reciprocal Formula is RT 111111 𝑅1 𝑅2 𝑅3 𝑅4 𝑅5

Calculating Total Resistanceof a Parallel Circuit So let use calculate RT in this circuit. RT 111111 𝑅1 𝑅2 𝑅3 𝑅4 𝑅5

Calculating Total Resistanceof a Parallel Circuit RT 1 1111111 1 1 11 𝑅1 𝑅2 𝑅3 𝑅4 𝑅55 14 21 25 10011 2.7Ω0.2 0.0714 0.0476 0.04 0.01 0.369

Series-Parallel CircuitsIf we combined a series circuit with a parallelcircuit we produce a Series-Parallel circuit. R1 and R2 are in parallel andR3 is in series with R1 ǁ R2.The double lines between R1and R2 is a symbol for parallel.We need to calculate R1 ǁ R2first before adding R3.

Series-Parallel Circuits Here we can use the shorter Product OverSum equation as we only have two parallelresistors.(R1 x R2) 27 𝑥 34 918R1 ǁ 2 (R1 R2) 27 34 61R1 ǁ 2 15.049Ω R3 RTRT 15.049 58 73.049Ω RT 73Ω

Series-Parallel Circuits Now that we have our circuit resistance of RT wecan calculate circuit current by using Ohm’s Law.If RT 73Ω and E 100VI 10073 1.369 Amps or 1.37 AThe parallel resistors must bereduced to a single series valuebefore being added to theseries resistor.

Series-Parallel Circuits Series-Parallel circuits can be more complex as in this case:In circuit (a) we have our original complex circuit. In circuit (b)we have resistors R1and R2 combinedto get 13.2Ω. R4 isin series with thenewly combined R12and their addedvalue is 51.2Ω.And now (c) we areleft with R124 inparallel with R3.(d) is our final circuit.

Series-Parallel Circuits Series, Parallel and Series-Parallel circuits areour three main types of circuits and they arecommon in DC and AC supplied circuits. A series circuit has one shared connectionpoint between components. A parallel circuit has two shared connectionpoints between components.

Series-Parallel CircuitsA series-parallel circuit can have two componentssharing one connection point with a single componentwhile they have two common connection pointsbetween them.Series Series-ParallelParallelSeries-Parallel

Series-Parallel CircuitsThe End

Series-Parallel Circuits If we combined a series circuit with a parallel circuit we produce a Series-Parallel circuit. R1 and R2 are in parallel and R3 is in series with R1 ǁ R2. The double lines between R1 and R2 is a symbol for parallel. We need to calculate R1 ǁ R2 first before adding R3.

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