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Power and Transferring energy by electricity (Transferring Energy Domestic…
Power and Transferring energy by electricity
Power
What it is
Amount of energy transferred per second
Measured in WATTS (W)
1W is a transfer of 1 Joule of energy per second
Equation
Power = Energy Transferred / Time taken
Energy Transferred = Power x Time Taken
Time Taken = Energy Transferred / Power
Transferring Energy Domestic Devices
DIfferent domestic devices
Energy is transferred from the batteries and the mains for motors and heating devices
Current
Direct Current
Movement of a current in only one direction. Cells and batteries supply this
Voltage in a circuit can increase to the highest and drop to 0
Alternating current
Alternating current direction of the current keeps moving
Voltage in a circuit with a alternating current increases to the highest in opposite direction then drops to 0
Mains Supply
50 Hertz (Hz)
230 Volts (V)
3kW power rating = 3000 joules personal
Equations
Electrical Power = Current x Potential difference
Electrical power = Current^2 x Resistance