# Physics revision

What colour are live wires?
BROWN
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What colour are earth wires?
GREEN OR YELLOW
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What colour are neutral wires?
BLUE
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What voltage is your body at ?
0V
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What are the two types of electricity and what are they?
Alternating current- constantly changing its direction of flow and it produced by an alternating voltage, where the positive and negative ends are always alternating. 2nd type is Direct current. Flows in a fixed direction- produced by direct voltage.
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What is work done?
When a charge flows around a circuit.
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The higher the power, the higher the ?
Energy.
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What is power measure in?
Watts or W
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What formula is used to work out energy transferred using time and power?
E=PT
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What formula is needed to work out energy transferred if you have electrical charge and potential difference?
E=QV
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What formulas can be used to work out power?
P=VI or P=I(squared)R
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What is the national grid?
A network of cables and transformers which transfer electrical power from power stations to consumers.
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## Other cards in this set

### Card 2

#### Front

What colour are earth wires?

GREEN OR YELLOW

### Card 3

#### Front

What colour are neutral wires?

### Card 4

#### Front

What voltage is your body at ?

### Card 5

#### Front

What are the two types of electricity and what are they?