Answer:
0.2 kW-hr
Step-by-step explanation:
First, we are going to transform 100W in kW. We can use a rule of three in which we know that 1000W is equivalent to 1 kW, then how many kW are equivalent to 100W. This is:
1000W ------------- 1 kW
100W -------------- X
Where X is the the number of kW that are equivalent to 100W. Solving for X, we get:
[tex]X=\frac{100W * 1kW}{1000W} =0.1kW[/tex]
Then, for calculate the number of kW-hr we need to multiplicate the number of kW with the number of hours, This is:
0.1 kW * 2 hours = 0.2 kW-hr
Finally, when one 100W light bulbs is used for 2 hours, it used 0.2 kW-hr
