Series and parallel circuits (AQA GCSE Physics): Flashcards

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Series and parallel circuits
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Number of current paths in series circuits

Only one path

Number of current paths in parallel circuits

More than one path

Current in series circuits

Same at every point

How is voltage distributed in series circuits?

Shared between components

Formula for total voltage in series (2 components)

Vtotal=V1+V2V_{total} = V_1 + V_2

Effect of adding resistors in series on total resistance

Total resistance increases

Formula for total resistance in series (2 resistors)

Rtotal=R1+R2R_{total} = R_1 + R_2

How does current behave at junctions in parallel circuits?

Current splits up

Formula for total current in parallel (2 branches)

Itotal=I1+I2I_{total} = I_1 + I_2

Voltage in parallel circuits

Same across each branch

Effect of adding resistors in parallel on total resistance

Total resistance decreases

Total resistance in parallel vs smallest individual resistor

Less than the smallest individual resistor

Resistance of an ammeter

Very low resistance

Resistance of a voltmeter

Very high resistance

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