Question

14)

It takes 3 minutes to make toast in a 1500 watt toaster. Calculate how much work is done by the toaster.
A) 8.3 J
B) 60 J
C) 90,000 J
D) 270,000 J

Answer 1

Watt is a unit for power that is also equal to J/s. We therefore need to convert the minutes to seconds first before answering. Every minute is comprised of 60 seconds. Therefore, 3 minutes are composed of 180 seconds. Multiplying the number of seconds to the given power will give us,
Work = Power x time
= (1500 J/s) x (180 s)
= 270,000 J
Therefore, the answer is letter D.