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The amount of energy used can be calculated by multiplying power x time:
energy = power x time
Since you normally pay the electricity used by the kilowatt-hour, it makes sense to convert the power rating to kilowatts. If it is specified in watts, divide that by 1000 to convert to kilowatts. Then multiply by the number of hours of use. For example: for a device that uses 100 watts, and which you turn on for 5 hours, your calculation would be:
0.1 kilowatt x 5 hours = 0.5 kilowatt-hours
On some devices, watts are not specified. In that case, multiplying volts x amperes is usually close to the number of watts used.
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If you know the power rating of an appliance and the voltage of the line it is attached to you can you calculate the current used by the appliance?
If I understood your question correctly, 'If you know the power rating of an appliance and the voltage of the line it is attached to, can you calculate the current used by the appliance?' You are looking for this equation: I = Current (Amps) P = Power Rating (Watts) V = Voltage (Volts) I = P/V This equation is useful when calculating the fuse rating for an appliance. For example, and appliance rated at 2400 watts, supplied with 240 volts has a 10 amp maximum. I = 2400/240 however, when it comes to paying for electricity, the energy is measured in units, which can be found using the equation: P = Power (kW) t = Time (Hours) Energy Used (Units) = Pt for example, an appliance rated at 2 kW used for 3 hours, uses 6 units of energy. Units = 2*3
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If you know the power rating of an appliance and the voltage of the line it is attached to you can you calculate the current used by the appliance?
If I understood your question correctly, 'If you know the power rating of an appliance and the voltage of the line it is attached to, can you calculate the current used by the appliance?' You are looking for this equation: I = Current (Amps) P = Power Rating (Watts) V = Voltage (Volts) I = P/V This equation is useful when calculating the fuse rating for an appliance. For example, and appliance rated at 2400 watts, supplied with 240 volts has a 10 amp maximum. I = 2400/240 however, when it comes to paying for electricity, the energy is measured in units, which can be found using the equation: P = Power (kW) t = Time (Hours) Energy Used (Units) = Pt for example, an appliance rated at 2 kW used for 3 hours, uses 6 units of energy. Units = 2*3
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