An electric bulb is rated 100W.How much electrical energy does it consume in 2 hours
The electrical energy consumed by an electric bulb is given by the product of its power and time.
Electrical energy = Power x time
In this case, the power rating of the bulb is 100W, and the time is 2 hours. Therefore, the electrical energy consumed by the bulb is:
Electrical energy = 100W x 2 hours = 200 watt-hours (Wh)
Alternatively, we can convert watt-hours to kilowatt-hours (kWh), which is a more commonly used unit of electrical energy:
1 kWh = 1000 Wh
Therefore, the electrical energy consumed by the bulb in 2 hours is:
Electrical energy = 200 Wh = 0.2 kWh.