Question

An electric kettle utilized 110 J of energy to heat water from 15 °C

to 100 °C. The heat energy received by the water is 85 J. What is
the efficiency of the electric kettle?

Answer 1

Answer: The efficiency of the electric kettle can be calculated using the formula:

Efficiency = (Heat energy received by the water / Energy input) * 100

Given data:

Energy input (E_in) = 110 J

Heat energy received by the water (E_out) = 85 J

Now, we can calculate the efficiency:

Efficiency = (85 J / 110 J) * 100 ≈ 77.27%

So, the efficiency of the electric kettle is approximately 77.27%.