Question

Jordan wants to know the difference between using a 60-W and 100-W lightbulb in her lamp. She calculates the energy it would take to use each bulb for 30 s by using this equation:
Power = Energy transferred (J)/time (s)

What is the difference in the amount of energy transferred by the two bulbs during this time?

A. 40 J
B. 1200 J
C. 1800 J
D. 3000 J

Answer 1

Answer:

B. 1200 J

Explanation:

Hello.

In this case, given the powers, we compute the energy transferred as shown below:

$E=P*t\\\\E_1=60J/s*30s=1800J\\\\E_2=100J/s*30s=3000J\\\\Difference=3000J-1800J\\\\Difference=1200J$

Therefore, answer is B. 1200 J .

Best regards.