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9 Terms
1
Current
Flow of electrical charge
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2
Potential difference
The driving force that pushes charge around
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3
Series
PD and resistance added up and current the same throughout
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4
Parallel
PD the same throughout Resistance equals 1 over Restince 1 add 1 over resitance two and current is added up
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5
Mains electricity
230 V
50 Hz -Ac mains supply (current flows in alternating directions voltages are positive and negative
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6
Plug
Neutral wire- (blue)- Completes circuit
Live wire-(brown)-
Earth wire-(green and yellow)
Fuse - which has a wire which melts if too much current flows through it
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7
Power
Watts (P=V x I , P=I2 x R)
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8
energy
Joules (Q xV)
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9
National grid
Power station → Step up transformer (PD is boosted up to 400,000 V and current is made as low as possible)→ it is then transferred by pylons to a step down transformer (which has more turns on primary coil) which lowers the voltage so it is safe to use at home.
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