1. When a motor is turned on, electrical energy is transformed to mechanical energy plus heat energy.

True or False

2. The outward evidence for this transformation can be seen only in the mechanical motion of the motor.

True or False

3. What is true of the efficiency of this motor?

a. it is more than 100% efficient

b. it is 100% efficient

c. it is less than 100% efficient

d. none of the above

Question

Physics

Emilie Bauer

12 June, 20:34

1. When a motor is turned on, electrical energy is transformed to mechanical energy plus heat energy.

True or False

2. The outward evidence for this transformation can be seen only in the mechanical motion of the motor.

True or False

3. What is true of the efficiency of this motor?

a. it is more than 100% efficient

b. it is 100% efficient

c. it is less than 100% efficient

d. none of the above

+3

Answers (1)

Know the Answer?

Marco Dawson · Answer 1

1.) The statement is true! ... heat energy is also generated due to the presence of resistance in motor. Heat generated is given by, H=i²Rt (i = current, R is the resistance of the conductor and t is time). 2.) This statement is false because transformation takes place in electrical motor too due to presence of resistance. 3.) c. it is less than 100% efficient.