Question

When energy is transferred from one part of a system to another, some of the

energy is lost during the transfer and cannot be used as it was intended.
Which two sentences describe examples of this?
A. An electric motor hums as it powers a conveyor belt
B. Stereo speakers emit sound when powered by electrical energy.
O C. Sunlight strikes a solar panel, generating electricity.
O D. A car engine heats up while the car is being driven.
E. Wind moves a turbine, generating electricity.

Answer 1

A. An electric motor hums as it powers a conveyor belt

D. A car engine heats up while the car is being driven.

Step-by-step explanation:

Answer 2

A. An electric motor hums as it powers a conveyor belt

D. A car engine heats up while the car is being driven.

Step-by-step explanation:

Energy inefficiency usually involves loss of energy as other forms when they are being converted from one form to another.

The two choices that fit the description includes;

• An electric motor humming as it powers a conveyor belt. This energy conversion is supposed to be from electrical to mechanical energy but there is a loss due to the sound energy produced by the motor.
• Heat energy produced as the car is driven also results in energy inefficiency.

Other choices do not show this inefficiency.