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Electrical power
The amount of energy transferred by an electrical appliance each second
Two things the amount of energy an appliance transfers depends on
How long the appliance is switched on for and the power of the appliance
P = E/t
The equation linking power, energy transferred and time
One watt is equal to
The power when one joule of energy is transferred in one second (1 W = 1 J/s)
E = IVt
The equation linking energy transferred, current, potential difference and time
230 V
The potential difference of mains electricity and electrical appliances
Power rating
The power of an electrical appliance; usually given watts (W) or kilowatts (kW)
Watts (W)
The SI unit for power
One kilowatt (kW) is equal to _____ watts (W)
1000 watts (W)
Seconds (s)
The SI unit for time
One hour (h) is equal to _____ seconds (s)
3,600 seconds (s)
Kilowatt-hour (kWh)
The unit used for energy transferred when power is in kilowatts and time is in hours (electricity is charged per kWh)
One kilowatt-hour (kWh) is equal to _____ joules (J)
3,600,000 joules (J)
Note 
Flashcard (49)