Question

A hot water system is 65% efficient. If it is
supplied with 3000 joules of electrical energy,
how much heat energy does it produce?​

Answer 1

Answer:

Heat energy  produced is 1950 joules

Explanation:

efficiency  of hot water system = 65 % = 0.65

electrical energy supplied input = 3000 Joules

heat energy produced is output. ie

efficiency = output / input

0.65 = output / 3000

output = 0.65 * 3000 = 1950

heat energy  produced is 1950 joules