A measure of the flow rate of electric charge - ammeter
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Potential difference (Volts) (PD)
A measure of the difference in electrical potential energy between tow points in a circuit - voltmeter
2 of 7
Ohmic Resistors
the current is directly proportional to the potential difference.
3 of 7
Resistance
Something that tries to stop the current flowing through. Meausred in Ohms
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Resistance Required practical
Changing the current using an ammeter to measure current, voltemter to measure the Potential Difference and a variable resistor to to change the current and potential difference
resistance = PD / Current
5 of 7
Mains Electricity
230V AC
live wire = Brown
Blue wire = Neutral
Green and yellow = Earth to protect metal cases incase of short circuit
6 of 7
National Grid
Step up transformer - increases voltage to make it more efficient as less heat is lost in pylons. stop down transformers - reduce it down to 250 V
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Other cards in this set
Card 2
Front
Potential difference (Volts) (PD)
Back
A measure of the difference in electrical potential energy between tow points in a circuit - voltmeter
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