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

Answers

Answer 1

Answer: 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.

Answer 2

Answer:

Answer:

1. True

2. False

3. c. it is less than 100% efficient

Related Questions

Tierra is playing in her backyard when she hears her friend calling out to her. She can't see her friend but can hear her friend's voice. Which wave phenomenon helps explain why Tierra can hear her friend even when she can't see her?interferencerefractionsuperpositiondiffraction
A pet turtle moves 30.1 mm in 72s. how slow is it moving? is this a speed or a velocity?
Two objects are dropped from rest from the same height. Object A falls through a distance during a time t, and object B falls through a distance during a time 2t. If air resistance is negligible, what is the relationship between A and B?
A spring gun consists of a spring inside a plastic tube with spring constant, k. The spring can be compressed 20 cm from its equilibrium length. A 100 g hard plastic ball is then loaded into the tube. If the ball is shot directly up and reaches a height of 2 m above the top of the tube, what is the spring constant, k? Ignore air resistance.A) 98 N/m B) 20 N/m C) 12 N/m D) 25 N/m E) 390 N/m
If the distance between two asteroids is halved, the gravitational force they exert on each other will a) Also be doubled b) Be half as greatc) Be one fourth as great d) Will be 1/16 as great e) Be four times greater

A car speeds up from 65 m/s to 120m/s in 9s. What is the acceleration of the car