Motors and Generators Review

What is the flow of an electric charge through a conductive medium?

• current

• commutator

• resistance

• torque

What is the stationary part of a rotor system called?

• current

• commutator

• stator

• voltage

What is the name of the rotary electrical switch in a motor? It applies power to the best location on the rotor.

• commutator

• current

• stator

• voltage

What is the rate at which work is done? It is also a measure of motor performance.

• horsepower

• voltage

• torgue

• resistance

What is the opposition to the passage of electric current through an element?

• torque

• resistance

• ohm's law

• voltage

How does the strength of an electromagnet change by an increase in the electricity traveling through the wire?

• It increases.

• It decreases.

Which of these is a correct explanation of Ohm's Law?

• V = IR

  V = voltage

  I = increase

  R = resistance

• V = IR

  V = voltage

  I = current

  R = resistance

If resistance stays the same, what can we do to increase the voltage?

• Increase current

• Increase voltage

• Decrease current

• Decrease resistance

How do we control the speed of a DC motor?

• By changing the wires

• By converting DC to AC

• By changing the amount of DC voltage

• You cannot control the speed of a DC motor.

What is the relationship between DC motor speed and DC motor current?

• They are inversely related.

• They are directly related.

• It depends on the gear ratio.

• There is no relationship between DC motor and DC motor current.