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WorksheetsIGCSE Electricity
Total questions: 60
Worksheet time: 1hrs 19mins
The electrical resistance of insulators is
High
Low
Zero
Infinitely high
An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
440 W
110 W
55 W
0.0023 W
In the circuits shown, all resistors are identical
Which circuit has the least resistance?
A
B
C
D
What would be the reading on the voltmeter?
2 V
6 V
4 V
8 V
A
B
C
D
A teacher writes a set of notes about two non-identical bulbs which are connected in parallel
He makes one mistake. Which of the statements below is incorrect?
They have the same current flowing through them
They have the same potential difference across them
They can be switched on and off individually
If one bulb blows, the other will continue to work
What is component Z ?
(a)
What is component B
Thermistor
Resistor
Light Dependent Resistor
Relay
How are resistance and length interrelated ?
Directly Proportional
Inversely Proportional
How is resistance and cross-sectional area interrelated?
Directly Proportional
Inversely Proportional
What does the voltmeter read?
2 V
3 V
10 V
1 V
What is the reading of the ammeter
0.32 A
0.44 A
1 A
0.28 A
What happens to the resistance of the LDR when it is dark
Resistance decreasae
Resistance increases
Resistance is constant
Resistance is unchanged
What happens to a thermistor on a hot day
Resistance increases
Resistance decreases
Resistance is constant
Resistance is unchanged
Which component matches this symbol?
LDR
Fuse
Cell
Variable resistor
Which component matches this symbol?
LDR
LED
Diode
Bulb
Which component matches this symbol?
fuse
LDR
thermistor
LED
Which of these 4 circuits can be used to measure how the current varies with a change in voltage across a bulb?
Which component has the following characteristic graph - showing how the current varies as the voltage is changed?
bulb
fuse
resistor
diode
Which component has the following characteristic graph - showing how the current varies as the voltage is changed?
bulb
resistor
diode
LDR
Which component has the following characteristic graph - showing how the current varies as the voltage is changed?
bulb
resistor
diode
cell
Which of these answers gives the correct way of connecting each meter?
A
B
C
D
What is the correct name for the unit for measuring resistance?
amp
volt
coulomb
ohm
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?
potential difference
potential divider
power difference
power divider
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?
2 mA
2 A
16 mA
16 A
To get a large current to flow in a wire, you can either
increase the wire resistance or increase the supply voltage
increase the wire resistance or decrease the supply voltage
decrease the wire resistance or increase the supply voltage
decrease the wire resistance or decrease the supply voltage
Which of these answers gives the correct change in resistance for each component?
A
B
C
D
The safety device that limits the current flow in a plug is the
fuse
cable grip
earth wire
insulation
Which of these is the correct formula for electrical power?
P = IV
V = IR
V = PI
P = V/I
A 240 volt, 3 amp heater is left running for 5 minutes.
Which of these gives the total energy output?
3.6 kJ
216 kJ
72 kJ
0.9 kJ
Which of the following is the correct unit for charge?
coulomb
capacitance
current
charge
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?
0.33 J
3 J
6 J
12 J
Which of the following is the definition of a 'volt'?
a joule per coulomb
a watt per coulomb
a joule per amp
a watt per ohm
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
B
C
D
The table described four different resistance wires. They are all made from the same metal. Which wire has the smallest resistance?
A
B
C
D
What is the unit of electromotive force?
ampere
newton
ohm
volt
What is the unit of electrical power?
ampere
joule
volt
watt
Four students are each given an identical resistor and asked to find its resistance. They each measure the potential difference across the resistor and the current in it. One student makes a mistake. Which row shows the results of the student that makes a mistake?
A
B
C
D
The circuit shown contains a battery, a 6 ohms resistor and two meters X and Y. One meter records current and one meter records potential difference.
A
B
C
D
Which quantities is a voltmeter used to measure?
current and e.m.f. only
current and p.d. only
e.m.f. and p.d. only
e.m.f., current and p.d
What is the ammeter reading with the switch closed?
A
B
C
D
What is the reading on the voltmeter?
A
B
C
D
The diagrams show four current-voltage graphs. Which two graphs show the characteristics of an ohmic resistor and of a filament lamp?
A
B
C
D
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
B
C
D
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
B
C
D
The circuit shown contains three ammeters, X, Y and Z. Which ammeter has the largest reading?
A
B
C
D
P and Q are the circuit symbols for two electrical components. Which components are represented by P and by Q?
A
B
C
D
The diagram shows two resistors connected in a circuit. What could be the combined resistance of this arrangement of resistors?
A
B
C
D
What are lamps in a house lighting circuit connected in parallel rather than in series?
if one lamp stops working, the remaining lamps become brighter
Less current is taken from the power supply
The lamps can be turned off independently using switches
When move lamps are added, their brightness decreases
Four lamps are each labelled 240V. In which circuit do all four lamps have normal brightness?
A
B
C
D
The diagram shows a potential divider connected to two voltmeters P and Q. The resistance of the variable resistor is decreased. Which row shows what happens to the reading on each voltmeter.
A
B
C
D
What is the total resistance of this arrangement?
A
B
C
D
The diagram shows a 10 ohms resistor and a 20 ohms resistor connected in a potential divider circuit. What is the reading on the voltmeter?
A
B
C
D
Which component is represented by this circuit symbol?
bell
fuse
relay
transformer
A student carries out an experiment to investigate the resistance of a resistor R. She takes a series of readings of potential difference (p.d.) and current, and plots a graph of her results. Which circuit should she use?
A
B
C
D
A circuit is connected for use as a potential divider. The resistance of resistor X is 10 ohms. When the resistance of the variable resistor Y is 20 ohms. What is the reading on the voltmeter?
4V
6V
8V
12V
Which circuit shows the directions of the conventional current I and the flow of electrons?
A
B
C
D
The resistance of a wire depends on its length l and on its cross-sectional area A.
The resistance is...
directly proportional to l and directly proportional to A
directly proportional to l and inversely proportional to A
inversely proportional to l and directly proportional to A
inversely proportional to l and inversely proportional to A
