## Quiz sheet for electrical power

Power used in an electrical circuit is measured in

A) volts

B) watts

C) amperes

D) ohms

ANSWER: B

Power in a d.c. circuit can be determined by the product of the readings from two separate instruments. These are the:

A) voltmeter and wattmeter

B) ammeter and wattmeter

C) voltmeter and ammeter

D) ohmmeter and wattmeter

ANSWER: C

If the voltage applied to a resistor is doubled the power will:

A) double

B) decrease by four times

C) halve

D) increase by four times

ANSWER: D

If the voltage applied to a resistor is halved the power will:

A) double

B) increase by four times

C) halve

D) decrease by four times

ANSWER: D

The rate at which energy is used is measured in

A) watts

B) joules

C) amperes

D) coulombs

ANSWER: A

Power may be defined as the rate at which

A) current changes

B) a quantity of electricity is dissipated

C) the resistance of a resistor changes

D) energy is expended

ANSWER: D

The term work is directly related to:

A) how quickly a body accelerates

B) how heavy a body is

C) the distance a force moves a body

D) the rate at which energy is used

ANSWER: C

If the electro-motive force applied to a circuit is doubled, the power consumption of that circuit will be:

A) doubled

B) halved

C) unchanged

D) quadrupled

ANSWER: D

If a 120 volt heater was connected to a 240 volt supply, its power consumption would be:

A) doubled

B) halved

C) unchanged

D) quadrupled

ANSWER: D

Last modified: Tuesday, 1 June 2021, 10:48 AM