How long was a 60 W light bulb turned on if it used a total of 580 J of energy?

A. 0.1 s

B. 9.7 s

C. 11.3 s

D. 580 min

Here's the tool you need. You can't answer the question without this:

"1 watt"

means

"1 joule of energy, generated, used, or moved, every second".

So 60 watts = 60 joules per second

Total energy generated,

used, or moved = (power) x (time).

580 joules = (60 watts) x (time)

Divide each side

by (60 watts) : Time = (580 joules) / (60 joules/sec)

= (9 and 2/3) seconds.