Question

NEED HELP PLEASE ASAP

The energy output of a fan is 36 kWh. The fan is 75% efficient.
How much energy is lost to the surroundings?

12 kWh
36 kWh
48 kWh
84 kWh

Answer 1

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

⇒ 0.25 kWh

Answer 2

12 kWh.

The input energy = 36kWh divide by 0.75 = 48kWh

The lost energy = 0.25 x 48kWh = 12kWh


because 25% of input energy is lost to the surrounding.