Current, Resistance & Potential Difference (AQA GCSE Physics): Flashcards

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Current, Resistance & Potential Difference
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Potential difference

Driving force causing charges to flow in circuit

Unit of potential difference

Volts (V)

Instrument to measure potential difference

Voltmeter

Voltmeter connection type

Parallel with the component

Resistance

Slows down flow of electrical charges in circuit

Unit of resistance

Ohms (Ω)

Equation relating V, I and R

V=IRV = IR

V in V=IRV=IR

Potential difference in volts (V)

I in V=IRV=IR

Current in amps (A)

R in V=IRV=IR

Resistance in ohms (Ω)

Rearrange V=IRV=IR to find R

R=VIR = \frac{V}{I}

Rearrange V=IRV=IR to find I

I=VRI = \frac{V}{R}

Relationship: resistance & wire length

Directly proportional

Current if V=8V, R=20Ω

I=820=0.4I = \frac{8}{20} = 0.4 A

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