Applied Electricity

Question 1

1The resistivity of a material depends on

Easy

A. its length only B. the material and its temperature C. the current through it D. its colour

Question 2

2The unit of capacitance is the

Easy

A. weber B. henry C. farad D. tesla

Question 3

31 milliampere equals

Easy

A. 0.01 A B. 1,000 A C. 0.1 A D. 0.001 A

Question 4

41 kilowatt-hour equals

Hard

A. 1000 J B. 3.6 MJ C. 36 MJ D. 3600 J

Question 5

5The resistance of a wire is doubled when its

Hard

A. length is halved B. area is doubled C. length is doubled D. temperature falls

Question 6

6Find the power used by a device drawing 5 A from a 230 V supply.

Easy

A. 2,300 W B. 1,150 W C. 46 W D. 235 W

Question 7

7A charge of 30 C flows past a point in 6 s. The current is

Hard

A. 180 A B. 36 A C. 5 A D. 0.2 A

Question 8

8The unit of electrical resistance is the

Easy

A. ohm B. watt C. volt D. ampere

Question 9

9Conductance is the reciprocal of resistance and is measured in

Easy

A. teslas B. henrys C. ohms D. siemens

Question 10

10The instrument used to measure current is the

Easy

A. ohmmeter B. voltmeter C. wattmeter D. ammeter