# Explain the meaning of the statement "The power of an appliance is 100W"

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by Kinger

2015-03-23T20:38:31+05:30

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The power of an appliance is 100W means it uses 100J of energy in every second on an average when it is operated.

2015-03-25T15:59:10+05:30

Watt is a unit for the rate of energy consumed (in the case of appliance).

If a 100-watt device is on for 10 hours, it will consume (100) X (10) = 1000 watt-hours of energy.

This is more commonly denoted as 1 kilowatt-hour (kWh). Your electric meter, like a cash register, measures the number of kilowatt-hours you consume each month. And you pay your electric supplier a rate based on \$/kWh. The national average may be on the order of \$0.10/kWh.

So for every 10 hours your 100-Watt appliance is running, it will cost you a whopping 10 cents.

An electrician would think more in terms of 'amps', which is a unit of current.

An appliance using 100wattts would be powered by 120 Volts; and the current draw would be 100/120, or 0.8 amps.

The ampere (SI unit symbol: A), often shortened to amp, is the SI unit of electric current (dimension symbol: I) and is one of the seven SI base units. It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics.
I hope this may be helpful.
*Ampere is equal to a flow of one coulomb per second.
**Coulomb is the practical meter-kilogram-second unit of electric charge equal to the quantity of electricity transferred by a current of one ampere in one second. It is named after French chemist Charles-Augustin de Coulomb (1736–1806). He is known for Coulomb's law.