Solution: According to the formula of work = power x time.

A 100w bulb works normally for five hours, and the power consumption is W = 100W *5 hours =100w * 5 * 3,600 seconds =18,000,000 w/s =18,000,000 joules.

That is, a 100 watt bulb consumes1800,000 joules when it works normally for five hours.

The calculation formula of electric quantity (electric energy) is W=P*t, and the unit kilowatt-hour (kW·h) of electric energy.

Where w stands for electric energy, p stands for active power, in kW, and t stands for time, in h. ..

The units of electric energy are coke, kilojoule, kilowatt hour, kilowatt hour and watt per second.

Conversion between electric energy units

1 joule = 1 watt× second, 1 kilojoule = 1000 joules, 1 degree = 1 kwh,

1 kwh = 1 kw×1hour = 1000 watt×1hour = 1000 watt× 3600 seconds =3600000 joules =3600 kilojoules.

Refer to the above content: Baidu Encyclopedia-Electricity