Question

Preston's clock produces 45 useful energy units for every 100 units of electricity used. What is the efficiency of the clock?

0.45 percent
100 percent
55 percent
45 percent

Answer 1

Answer:

0.45 percent

Explanation:

if 1 useful energy unit = 1 unit of electricity

then ratio of efficiency would form

=45:100 (simplified further)

=9:20

=0.45

Answer 2

Answer:

answer is 0.45 %

hope it's help you