Physics for IGCSE & O level - Electricity (Section 3)
1
Which of the following components is found in a circuit and used to turn the circuit on and off?
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(C)
Switch
2
Which of the following is a good conductor of electricity?
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(C)
Copper
3
In a series circuit, if the resistance increases, what happens to the current?
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(B)
The current decreases.
4
What is the effect of temperature on the resistance of a semiconductor?
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(B)
Resistance decreases with increasing temperature.
5
If a 60W bulb and a 100W bulb are connected in parallel, which bulb will be brighter?
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(B)
The 100W bulb
6
In a parallel circuit, how is the total current related to the current through each branch?
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(C)
The total current is the sum of the currents in each branch.
7
Which of these appliances typically draws the highest current?
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(C)
An electric kettle
8
Which of these will increase the resistance of a wire?
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(D)
Increasing the length of the wire.
9
What is the relationship between power and current, given a constant voltage?
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(A)
Power is directly proportional to current.
10
Which of these devices is used to convert electrical energy into light?
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(C)
A light bulb
11
What is the difference between a series circuit and a parallel circuit in terms of current flow?
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(A)
Current is constant in a series circuit, but divides in a parallel circuit.
12
What component is used to convert electrical energy into light?
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(C)
Light bulb
13
In a parallel circuit with two resistors, if the current through one resistor is 2A and the current through the other is 3A, what is the total current supplied by the battery?
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(D)
5 A
14
What is the purpose of the neutral wire in a mains cable?
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(A)
To carry the current back to the source.
15
Which of these is a correct way of calculating voltage (V)?
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(B)
V = I * R
16
What type of current is supplied by a battery?
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(B)
DC
17
Which safety device is designed to open a circuit automatically when the current exceeds a certain value?
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(C)
Fuse
18
What is the effect on the resistance of a wire if you increase its cross-sectional area?
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(B)
Resistance decreases
19
What do conductors allow?
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(A)
Flow of electrons
20
What is measured in amperes?
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(B)
Current
21
If the voltage is constant, what happens to the current if the resistance increases?
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(B)
It decreases
22
What is the energy needed to move a unit charge between two points?
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(B)
Potential difference
23
What is the formula relating charge, current, and time?
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(B)
Charge = Current * Time
24
Which circuit arrangement is typically used for household wiring?
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(B)
Parallel
25
What is the total resistance of two 10-ohm resistors connected in series?
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(C)
20 ohms
26
What does the symbol on a lamp mean in a circuit diagram?
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(D)
A device that converts electrical energy into light
27
Which of the following components does NOT need an earth wire for safety?
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(D)
Double-insulated appliance
28
What are the two main types of electric circuits?
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(A)
Series and Parallel
29
What is the purpose of a switch in a circuit?
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(C)
To open or close the circuit
30
Which of these is the correct formula for calculating power (P)?
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(A)
P = V x I
31
What is the relationship between voltage (V), current (I), and resistance (R) in a circuit?
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(B)
V = I * R
32
What happens to the total power in a parallel circuit if one branch burns out?
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(B)
Decreases
33
What happens to the total resistance if two resistors are connected in series?
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(A)
The total resistance is the sum of the two resistors.
34
What is the formula for calculating power?
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(B)
P=V*I
35
Which part of a three-pin plug connects to the earth wire?
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(C)
The earth pin
36
What happens to the brightness of a lamp in a series circuit if the voltage of the battery is increased?
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(B)
Brightness increases
37
If two resistors (R1 and R2) are connected in parallel, and R1 = R2, what is the total resistance compared to either resistor?
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(C)
Half of either
38
What happens to the total power dissipated in a series circuit if you add more resistors?
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(A)
Increases
39
Which formula represents Ohm's law?
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(A)
V = I * R
40
What is the SI unit of electromotive force (EMF)?
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(B)
Volt
41
Which component is used to change AC voltage levels?
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(C)
Transformer
42
What type of current does a domestic electrical supply in many countries provide?
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(B)
Alternating Current (AC)
43
In a parallel circuit, if one branch opens (breaks the circuit), what happens to the other branches?
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(C)
The current in the other branches remains the same.
44
What does the fuse protect the electrical circuit against?
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(B)
Excess current
45
What happens to the total resistance of a circuit if more resistors are added in parallel?
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(B)
Decreases
46
How is the total resistance in a series circuit affected if one of the resistors is removed?
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(B)
Decreases
47
Which of the following is NOT a good conductor?
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(C)
Rubber
48
What is the name given to static electricity?
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(D)
electrostatic
49
Which is the formula relating power (P), current (I), and resistance (R)?
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(C)
P = I^2 * R
50
What is the total resistance of two resistors, one of 3 ohms and the other of 6 ohms, connected in parallel?
