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Paul Sheffield

on 9 January 2018

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Transcript of Electricity

National grid

design by Dóri Sirály for Prezi
What is the power of a mower with a current of 10A and a p.d of 230v
What is the resistance?
What is the work done by an 80kg climber who climbs a 100m cliff (gravity = 9.81 N/kg)
How powerful is he if he does it in 10 mins?
National grid
Key ideas
The power of a device is related to the potential difference across it and the current through it by the equation:
potential difference x current
[P = V I ]
power =
current squared x resistance
[P = I^2 R ]
power, P, in watts, W
potential difference, V, in volts, V
current, I, in amperes, A
resistance, R, in ohms, Ω

high p.d
low current
low resistance
400,000 v
step up transformer
step down transformer
needs to be A.C
Work Done
Work is done when charge flows in a circuit.
The amount of energy transferred by electrical work can be calculated using the equation:
energy transferred=
power x time
[ E = P t ]
energy transferred =
charge flow x
potential difference
[ E = Q V ]
energy transferred, E, in joules, J
power, P, in watts, W
time, t, in seconds, s
charge flow, Q, in coulombs, C
potential difference, V, in volts, V

pages 70-71
Pages 68-69
Full transcript