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P4 - Electricity and Magnetism - REVISION

Total questions: 80

Worksheet time: 2hrs 2mins

Name
Class
Date
1.

Graph represents two conductors with different value of resistance. Resistance of A is _________________ than B.

a)

Higher

b)

Lower

2.

What is the resistance in this circuit?

a)

0.05Ω

b)

1.8Ω

c)

20Ω

3.

What is the resistance of an object that draws 0.24 A when connected to a 120 V circuit?

a)

0.024 Ω

b)

28.8 Ω

c)

124 Ω

d)

500 Ω

4.

What is the current drawn by a 10 Ω resistor when it is connected to a 12 V car battery?

a)

22 amperes

b)

1.2 amperes

c)

0.83 amperes

d)

120 amperes

5.

Two balloons, X and Y, are suspended by insulating threads. They are each held near a negatively charged balloon. The balloons hang as shown.

a)

A

b)

B

c)

C

d)

D

6.

What is the unit of electromotive force?

a)

amperes

b)

newtons

c)

ohms

d)

volts

7.

What is the unit of electrical power?

a)

amperes

b)

joules

c)

volts

d)

watts

8.

Which of the above diagrams shows the magnetic field lines around the north pole of a magnet?

a)

A

b)

B

c)

C

d)

D

9.

When magnets and metal bars are close together they experience forces.


Which row gives the correct description of the effect between these materials?

a)

A

b)

B

c)

C

d)

D

10.

Some magnets are easily magnetised when placed in a magnetic field, and then quickly lose their magnetism once the field is removed. These materials are used in electromagnets, and are called...

a)

soft magnetic materials

b)

hard magnetic materials

c)

temporary magnets

d)

partial magnets

11.

What is the correct equation linking charge current and time

a)

Q = It

b)

I = Qt

c)

t = QI

12.

What is the correct equation for electrical power

a)

P = I x V

b)

P = V / I

c)

P = I / V

13.

What is the name of the Law that relates current, voltage and resistance in an electrical circuit?

a)

Ohm's Law

b)

Lenz's Law

c)

Faraday's Law

d)

Hooke's Law

14.
What kind of magnet can be turned on and off?
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
15.
The magnetic field of an electromagnet ______.
a)
Can be turned on and off.
b)
Is permanent.
c)
Lasts for only one hour.
d)
Lasts for one day.
16.

This circuit has a 24 volts battery and the resistor is 8 ohms. How many amps are running through the circuit?

a)

3 Amps

b)

192 Amps

c)

2 Amps

d)

4 Amps

17.

What unit is used to measure voltage?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

18.

Which is the right form of Ohm's Law linking voltage, current and resistance?

a)

V=I/R

b)

V=R/I

c)

I=V/R

d)

I=R/V

19.

What is the correct name for the unit for measuring resistance?

a)

amps (A)

b)

volts (V)

c)

coulombs (C)

d)

ohms (Ω)

20.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What does p.d. stand for?

a)

potential difference

b)

potential divider

c)

power difference

d)

power divider

21.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What is the current through the resistor?

a)

2 mA

b)

2 A

c)

16 mA

d)

16 A

22.

To get a large current to flow in a wire, you can either

a)

increase the wire resistance or increase the supply voltage

b)

increase the wire resistance or decrease the supply voltage

c)

decrease the wire resistance or increase the supply voltage

d)

decrease the wire resistance or decrease the supply voltage

23.

Which of the following is the correct unit for charge?

a)

coulombs (C)

b)

Amps (A)

c)

current (I)

d)

charge (Q)

24.

A 6 V light bulb is switched on for a short time. A 6 V battery transfers 2 C of charge to the bulb in this time. What energy has been transferred?

a)

0.33 J

b)

3 J

c)

6 J

d)

12 J

25.

Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?

a)

copper, iron, a compass needle

b)

copper, iron, polythene

c)

iron, steel, a compass needle

d)

iron, steel, polythene

26.

Which properties make materials suitable for use as a core in an electromagnet?

a)

difficult to magnetise and easy to demagnetise

b)

difficult to magnetise and retains magnetic strength

c)

easy to magnetise and retains magnetic strength

d)

easy to magnetise and easy to demagnetise

27.

Which row describes the ease with which iron or steel can be magnetised and demagnetised?

a)

A

b)

B

c)

C

d)

D

28.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
29.
True or False: All metals stick to magnets.
a)
True
b)
False
30.

The AREA around a magnet where a magnet experiences a force.

a)

Gravitational field

b)

Magnetic Field

c)

Electric field

d)

Magnetism

31.

What unit of electricity measures the amount of current ?

a)

Volts (V)

b)

Coulombs (C)

c)

Amperes (A)

d)

Ohms (Ω)

32.

Which of the following materials is an electrical conductor?

a)

Plastic spoon

b)

Silver-colored plastic spoon

c)

copper spoon

d)

wooden spoon

33.

Particles with the _________ charge are attracted to each other.

a)

Like (same)

b)

Unlike (opposite)

34.

Which of the following is a good insulator?

a)

copper

b)

aluminum

c)

glass

d)

silver

35.
a)

A

b)

B

c)

C

d)

D

36.

Equation for voltage

a)

current x resistance

b)

current / resistance

c)

resistance / current

d)

Resistance x amps

37.

Unit of electrical charge is

a)

C (Coulombs)

b)

J (Joules)

c)

A (amps)

d)

V (volts)

38.

Equation for electrical power

a)

voltage x current

b)

voltage / current

c)

current / voltage

d)

voltage + current

39.

Electrical power is measured in

a)

Joules

b)

Watts

c)

Amps

d)

Volts

40.
The power of an appliance is...
a)
the amount of voltage going through it 
b)
the amount of energy transferred per second
c)
the amount of charge that passes through per second
41.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)

170 W

b)

170 Ω

c)

1.7 Ω

d)

1.7 W

42.
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
 
Remember: V=IR and P=VI
a)

80 W

b)

200 W

c)

2.5 A

d)

22.5 kJ

43.

What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?

a)

4.55 A

b)

28800 J or 28.8 KJ

c)

80 W

d)

200 A

44.
What is the power of a 20V bulb with 5A through it?
a)

100 W

b)

100 V

c)

6.3 W

d)

6.3 V

45.
Thicker wires have _______ resistance than thinner wires.
a)
more
b)
less
c)
the same
46.
Electric current is measured in ______.
a)
Watts
b)
Volts
c)
Amperes
47.

Electricity in a metals wire is the flow of _________.

a)

protons

b)

neutrons

c)

electrons

48.

10C of charge flows in a wire every 2 seconds. Calculate the current in the wire.

a)

5 Ohms

b)

5 Amps

c)

0.2 Volts

d)

0.2 Amps

49.

Longer wires have _______ resistance than shorter wires.

a)

more

b)

less

c)

the same

50.

If a cell provides 12 V to a circuit and 4 C of charge flows. How much energy is being provided by the cell?

a)

3 J

b)

0.25 J

c)

48 J

d)

16 J

51.

What is a material called that easily carries a current?

a)

insulator

b)

electric potential

c)

semiconductor

d)

conductor

52.

I am rubbing a glass rod with silk. If the rod ends up being positively charged, what is the charge of the silk?

a)

negative

b)

positive

c)

neutral

53.

Which of the following type of copper wire would you expect to have the least electric resistance?

a)

a thick long wire

b)

a thick short wire

c)

a thin long sire

d)

a thin short wire

54.

If two charges repel each other, the two charges could be

a)

Positive and neutral

b)

Positive and negative

c)

positive and neutral

d)

negative and negative

55.
A negatively charged particle has
a)
more protons than electrons.
b)
more electrons than protons
c)
an equal number of protons and electrons
56.

What is a formula to calculate Charge

a)

Q=It

b)

Q=ItQ=\frac{I}{t}

c)

Q=VE

d)

Q=IR

57.

How are resistance, voltage and current related?

a)

V = IR

b)

R=IVR=\frac{I}{V}

c)

V=IRV=\frac{I}{R}

d)

R=IV

58.

How do you calculate electrical power?

a)

Power = current x voltage

b)

Power=currentvotlagePower=\frac{current}{votlage}

c)

Power = energy x time

d)

Power = resistance x time

59.

How do you calculate the energy transferred in a component?

a)

E=IVt

b)

E=tIVE=\frac{t}{IV}

c)

E=IV

d)

E=Q/t

60.

A current of 12 A flows for 20 minutes into an electric cooker.

How much charge has the cooker used?

a)

14400 C

b)

280 C

c)

100 C

d)

0.6 C

61.

The current in a motor is 2.1 A and the potential difference across it is 12V. The motor takes 1.5 seconds to lift a mass. What is the energy transferred to the motor as it lifts the mass?

a)

85 J

b)

3.8 J

c)

38 J

d)

8.5 J

62.

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

a)

440 W

b)

110 W

c)

55 W

d)

0.0023 W

63.
a)

A

b)

B

c)

C

d)

D

64.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What does p.d. stand for?

a)

potential difference

b)

potential divider

c)

power difference

d)

power divider

65.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 10 V across it.


What is the current through the resistor?

a)

2.5 mA

b)

2.5 A

c)

40 mA

d)

40 A

66.

To get a large current to flow in a wire, you can either

a)

increase the wire resistance or increase the supply voltage

b)

increase the wire resistance or decrease the supply voltage

c)

decrease the wire resistance or increase the supply voltage

d)

decrease the wire resistance or decrease the supply voltage

67.

A 240 volt, 3 amp heater is left running for 5 minutes.


Which of these gives the total energy output?

a)

3.6 kJ

b)

216 kJ

c)

72 kJ

d)

0.9 kJ

68.

The diagrams show four current-voltage graphs. Which two graphs show the characteristics of an ohmic resistor and of a filament lamp?

a)

A

b)

B

c)

C

d)

D

69.

A resistor of resistance R is connected to a battery of e.m.f. V. There is a current I in the resistor. Power P is dissipated by the resistor, and in time t the energy transferred is E. Which expression is correct?

a)

A

b)

B

c)

C

d)

D

70.

In the circuit shown, the ammeter reads 2.0A and the voltmeter reads 12V. How much energy is transferred by the resistor in 10 seconds?

a)

A

b)

B

c)

C

d)

D

71.

Two similar balloons hang side by side, on insulating threads, a short distance apart. They are both rubbed with the same dry cloth and become charged. Which diagram shows how the balloons hang after charging?

a)

A

b)

B

c)

C

d)

D

72.

A wire has a certain electrical resistance. The diameter and length of the wire may be changed. Which pair of changes must cause the resistance of the wire to increase?

a)

A

b)

B

c)

C

d)

D

73.

What is/are magnetic material(s)?

Tick all the correct answers.

a)

Silver

b)

Nickel

c)

Copper

d)

Coban

74.

A plastic rod and a dry cloth are uncharged. The rod is now rubbed with the cloth and they both become charged. The rod becomes negatively charged because some charged particles move from the cloth to the rod. What is the charge on the cloth and which particles moved in the charging process?

a)

A

b)

B

c)

C

d)

D

75.
Q6. A bar of soft iron and a bar of steel are held in contact with a strong magnet. Both bars become magnetised The two bars are now moved away from the magnet. Which statement about the bars is correct?
a)
A Both bars easily lose their magnetism.
b)
B Neither of the bars easily lose its magnetism.
c)
C The soft iron bar easily lose its magnetism but the steel bar retains its magnetism.
d)
D The steel bar easily lose its magnetism but the soft iron bar retains its magnetism.
76.

A laptop is plugged into a 120 V outlet and uses 60 ohm's of resistance. How much current is running though it?

a)

120 Amps

b)

60 Amps

c)

2 Amps

d)

20 Amps

77.

__________ is the tendency for certain materials to slow or impede the flow of electrons.

a)

Potential difference

b)

Current

c)

Power

d)

Resistance

78.

Electric field is

a)

the region of space that a magnet experiences a force

b)

the region of space that an electric charge experiences a force

c)

the region of space that a mass experiences a force

79.

Mr. Robinson and his class are conducting an experiment. The class needs to choose a good insulator. Which of the following could be used as an insulator?

a)

plastic plate

b)

copper rod

c)

silver spoon

d)

aluminium wire

80.

Charging takes 110 minutes and causes a total charge of 180 000 C to pass through the battery. What is the average charging current in the battery?

a)

1636 A

b)

163.6 V

c)

27.3 A

d)

27.3 V

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