Question

an electric bulb is marked 60W. What does this mean? How much energy does it consume if used for 1 hour?

Answer 1

60W is the power rating of the bulb which means that it will consume 60 Joules of energy every second.

Now, the amount of energy consumed in 1 hour will be

E = 60W x 3600s

or

E = 216000 J