Potential difference & resistance (Edexcel GCSE Physics): Flashcards

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Potential difference & resistance
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Potential difference definition

Driving force causing electric charges to flow

Unit of potential difference

Volts (V)

Tool to measure potential difference

Voltmeter

How to connect voltmeter

In parallel with the component

Resistance definition

Slows down the flow of electrical charges

Unit of resistance

Ohms (Ω\Omega)

Equation relating V, I, and R

V=IRV = IR

Formula to calculate current from V and R

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

Effect of electrons colliding with ions

Ions vibrate and heat up

Effect of heating on electron flow in resistor

Harder for electrons to pass through

Thermistor resistance when warming up

Decreases

What happens if resistor gets too hot

Current stops

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