WorksheetsIGCSE Physics Electrical
Total questions: 79
Worksheet time: 40mins
What is the total resistance of three resistors, 2 Ω, 4 Ω, and 6 Ω, connected in series?
2 Ω
12 Ω
6 Ω
1/12 Ω
If a 60 W light bulb is connected to a 120 V supply, what is the current flowing through the bulb?
0.25 A
0.5 A
1 A
2 A
Which of the following statements is true about a parallel circuit?
The total resistance is the sum of the individual resistances
The total resistance is always greater than the largest resistance
The current is the same in all branches
The voltage is the same across all branches
What is the unit of electrical resistance?
Volt
Ohm
Ampere
Watt
A 10 Ω resistor and a 20 Ω resistor are connected in parallel. What is the combined resistance?
15 Ω
30 Ω
6.67 Ω
2 Ω
What happens to the current in a wire if the potential difference is doubled, assuming the resistance stays the same?
It doubles
It halves
It stays the same
It quadruples
An electron moves through a potential difference of 12 V. What is the energy gained by the electron?
12 J
1.92 x 10^-19 J
19.2 x 10^-19 J
1.6 x 10^-19 J
What is the power dissipated by a 5 Ω resistor carrying a current of 2 A?
10 W
20 W
25 W
50 W
A circuit has a total current of 3 A and a total resistance of 4 Ω. What is the voltage supplied by the source?
3 V
12 V
1.33 V
7 V
A current of 5 A flows through a wire for 10 seconds. How much charge has passed through the wire?
0.5 C
2 C
50 C
10 C
A copper wire has a resistance of 8 Ω. If its length is doubled, what happens to its resistance?
It remains the same
It halves
It doubles
It quadruples
What is the correct formula for calculating electrical power?
P = I²R
P = V/R
P = IR
P = I²/V
In a metal conductor, the electric current is due to the movement of which particles?
Protons
Neutrons
Electrons
Atoms
A 12 V battery is connected to a 4 Ω resistor. What is the power dissipated by the resistor?
12 W
24 W
36 W
48 W
Two resistors, 6 Ω and 12 Ω, are connected in series. What is the total resistance?
6 Ω
12 Ω
18 Ω
2 Ω
What is the main factor that affects the resistance of a conductor?
Length of the conductor
Type of conductor
Temperature of the conductor
All of the above
A 10 A current flows through a 5 Ω resistor. What is the voltage across the resistor?
2 V
5 V
50 V
500 V
What is the relationship between power, current, and voltage?
P = IV
P = V/I
P = I/V
P = VI²
If the resistance of a circuit is tripled, what happens to the current for a constant voltage?
It doubles
It triples
It halves
It decreases by one-third
A current of 0.2 A flows through a wire with a resistance of 15 Ω. What is the voltage across the wire?
1 V
3 V
5 V
15 V
What is the total resistance of three resistors connected in parallel, with resistances 10 Ω, 20 Ω, and 30 Ω?
5.45 Ω
6 Ω
7.27 Ω
10 Ω
A 240 V appliance is rated at 1200 W. What is the current flowing through the appliance?
0.5 A
2 A
5 A
10 A
A circuit contains a 3 Ω and a 9 Ω resistor in parallel. What is the total resistance?
1.5 Ω
2.25 Ω
6 Ω
3 Ω
A charge of 10 C passes through a conductor in 2 seconds. What is the current?
5 A
2 A
20 A
10 A
What happens to the resistance of a wire if its diameter is doubled?
It doubles
It quadruples
It halves
It decreases by a factor of 4
What is the work done when a charge of 5 C moves through a potential difference of 12 V?
60 J
120 J
240 J
5 J
If a circuit has a total resistance of 10 Ω and a current of 3 A, what is the power dissipated?
10 W
30 W
90 W
300 W
A resistor is rated at 100 Ω with a 5% tolerance. What is the possible range of the actual resistance?
95 Ω to 105 Ω
90 Ω to 110 Ω
100 Ω to 105 Ω
97 Ω to 103 Ω
The heating effect in a wire is proportional to which of the following?
Current²
Current³
Voltage²
Resistance
What is the energy transferred by a 2 kW heater running for 3 hours?
6 kWh
2 kWh
1.5 kWh
9 kWh
A resistor is connected to a 10 V power supply and dissipates 20 W of power. What is the current through the resistor?
0.5 A
1 A
2 A
4 A
What is the total current in a circuit with three resistors in parallel, each with 2 A of current?
2 A
4 A
6 A
8 A
If the voltage across a resistor is halved, what happens to the power dissipated?
It doubles
It stays the same
It halves
It reduces by a factor of 4
What is the potential difference across a 4 Ω resistor when a current of 0.5 A flows through it?
2 V
4 V
6 V
8 V
What is the time taken for a charge of 20 C to pass through a point if the current is 4 A?
2 s
4 s
5 s
6 s
A power source provides 240 V and 0.5 A. What is the resistance of the device connected to it?
120 Ω
240 Ω
480 Ω
500 Ω
A fuse is used to protect an electrical circuit from which of the following?
Excess voltage
Excess power
Excess current
Excess resistance
What is the resistance of a wire if a current of 3 A flows through it when a potential difference of 9 V is applied?
1 Ω
2 Ω
3 Ω
5 Ω
If the resistance of a wire is 6 Ω and the current is 3 A, what is the voltage across the wire?
6 V
12 V
18 V
24 V
In a series circuit, how does the total resistance change when a resistor is added?
It increases
It decreases
It stays the same
It doubles
In a circuit with a 240 V supply and a current of 5 A, what is the total power?
500 W
1000 W
1200 W
1200 W
A resistor has a power rating of 100 W. If it is connected to a 50 V source, what is its resistance?
25 Ω
10 Ω
50 Ω
75 Ω
If the resistance of a wire is quadrupled, what happens to the current for a constant voltage?
It doubles
It stays the same
It halves
It decreases by a quarter
Which of the following best describes the relationship between current and resistance in a series circuit?
The current is directly proportional to resistance
The current is inversely proportional to resistance
The current remains constant regardless of resistance
The current is equal to the voltage divided by resistance
The potential difference across two points is 30 V and the current is 3 A. What is the resistance?
5 Ω
10 Ω
15 Ω
30 Ω
How does the internal resistance of a battery affect its terminal voltage?
Increases it
Decreases it
No effect
It causes the terminal voltage to vary randomly
In a series circuit with resistors of 5 Ω, 10 Ω, and 15 Ω, what is the total current if the supply voltage is 60 V?
4 A
2 A
1 A
0.5 A
A parallel circuit has three resistors: 10 Ω, 20 Ω, and 30 Ω. What is the total current if the total voltage is 60 V?
3 A
6 A
9 A
12 A
What is the current flowing through a 100 W, 120 V lamp?
0.5 A
0.83 A
1 A
1.2 A
If the current through a resistor is doubled, how does the power dissipated by the resistor change?
It remains the same
It halves
It doubles
It quadruples
A circuit has a total resistance of 8 Ω and the current is 2 A. What is the power consumed by the circuit?
16 W
32 W
64 W
128 W
What is the combined resistance of two 10 Ω resistors in parallel?
20 Ω
10 Ω
5 Ω
2.5 Ω
If the current in a conductor is 0.2 A and the charge passing through a point in 4 seconds is measured, what is the charge?
0.8 C
2 C
0.05 C
0.2 C
A 12 V battery supplies a current of 3 A for 2 hours. How much energy is supplied?
12 J
72 J
25920 J
43200 J
What happens to the drift velocity of electrons in a conductor if the cross-sectional area is doubled while keeping the current constant?
It doubles
It remains the same
It halves
It becomes zero
How much current flows through a 1000 Ω resistor connected to a 50 V supply?
0.05 A
0.1 A
0.5 A
1 A
In a series circuit, the current across two resistors is 2 A. If the total resistance is 10 Ω, what is the voltage across the entire circuit?
10 V
5 V
20 V
30 V
What is the effective resistance when a 20 Ω resistor and a 60 Ω resistor are connected in parallel?
15 Ω
20 Ω
45 Ω
12 Ω
The electromotive force (EMF) of a battery is 9 V, and the internal resistance is 1 Ω. If the current is 2 A, what is the terminal voltage?
11 V
7 V
5 V
9 V
If a circuit has a voltage of 15 V and a power of 45 W, what is the current?
3 A
5 A
1 A
2 A
Which factor does NOT affect the resistance of a wire?
Temperature
Length
Material
Color
What is the total charge passing through a point in 30 seconds if the current is 0.5 A?
15 C
1.5 C
0.5 C
3 C
A 10 Ω resistor is placed in series with a 20 Ω resistor. What is the total resistance?
15 Ω
30 Ω
10 Ω
5 Ω
If the resistance in a circuit is constant and the voltage is doubled, what happens to the current?
It stays the same
It doubles
It halves
It quadruples
What is the power dissipated by a 4 Ω resistor with a 3 A current?
12 W
36 W
9 W
48 W
A conductor carries a current of 2 A for 10 seconds. How much charge passes through the conductor?
20 C
2 C
10 C
5 C
If three resistors are connected in parallel with resistances of 4 Ω, 8 Ω, and 16 Ω, what is the total resistance?
8 Ω
3 Ω
2.29 Ω
16 Ω
The electrical energy consumed by a device depends on which factors?
Voltage and resistance
Current and resistance
Voltage and time
Voltage, current, and time
A circuit has a current of 0.5 A and a voltage of 240 V. What is the total power?
120 W
240 W
480 W
1200 W
Which of the following is NOT a function of a fuse in a circuit?
Preventing excessive current flow
Protecting against short circuits
Reducing resistance
Melting when too much current flows
A 50 W device is connected to a 25 V supply. What is the current?
2 A
4 A
0.5 A
1 A
What is the correct definition of electric current?
The rate of flow of charge
The total amount of charge
The potential difference
The energy transferred per unit charge
Which of the following best describes Ohm's Law?
V = IR
V = I²R
P = IV
I = VR
What happens to the overall resistance in a parallel circuit when more resistors are added?
It increases
It decreases
It stays the same
It fluctuates
What is the unit for electrical energy?
Joule
Watt
Ampere
Ohm
A battery with a terminal voltage of 9 V is connected across a resistor. If the current through the resistor is 1.5 A, what is the resistance of the resistor?
5 Ω
6 Ω
9 Ω
12 Ω
A wire has a resistance of 8 Ω at 20°C. What happens to its resistance if its temperature increases?
It increases
It decreases
It stays the same
It fluctuates
What is the relationship between electric current and drift velocity?
They are inversely proportional
They are directly proportional
There is no relationship
Drift velocity is twice the current
The potential difference across a resistor is 24 V, and the current through it is 0.8 A. What is the resistance of the resistor?
15 Ω
20 Ω
30 Ω
40 Ω
