The energy output of a blender is 1.4 kWh. If the blender is 85% efficient, how much energy is lost to the surroundings? kWh

Answer: 0.3 kwh

Explanation:

1) Efficiency

The definition of efficieny is (energy output / energy input) * 100

⇒ 85 = (1.4 Kwh / energy input) * 100

⇒ energy input = 1.4 kwh * 100 / 85 = 1.647 kwh ≈ 1.7 kwh

2) The energy lost is: energy input - energy output = 1.7 kwh - 1.4 kwh = 0.3 kwh