Electricity and Electromagnetism questions

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Electricity and Electromagnetism question collection

Review Electricity and Electromagnetism questions for Physics, with correct answers shown and coverage across current as a flow of charge; potential difference and resistance; series and parallel circuits.

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Question 1

What is electric current?
  1. A flow of electric charge
  2. A build-up of stationary charge
  3. A transfer of thermal energy
  4. A force between magnetic poles

Question 2

Which unit is used to measure electric current?
  1. Ampere (A)
  2. Volt (V)
  3. Ohm (Ω)
  4. Joule (J)

Question 3

What is potential difference (voltage)?
  1. Energy transferred per unit charge
  2. The current lost per second
  3. The resistance of the wire
  4. The temperature of the source

Question 4

What does resistance describe?
  1. How much a component opposes the current
  2. How fast charges move past each other
  3. The number of electrons in the wire
  4. The brightness of a bulb

Question 5

What happens to total resistance when resistors are added in series?
  1. It increases
  2. It decreases
  3. It stays unchanged
  4. It becomes the resistance of one resistor

Question 6

Which material is a good electrical conductor?
  1. Copper
  2. Plastic
  3. Glass
  4. Dry wood

Question 7

What happens when a switch is opened?
  1. The circuit breaks and current stops
  2. The switch bypasses the component
  3. A new parallel branch is connected
  4. The current reverses direction

Question 8

Which energy transfer occurs in a resistor?
  1. Electrical energy to thermal energy
  2. Electrical energy to chemical energy
  3. Thermal energy to gravitational energy
  4. Chemical energy to elastic energy

Question 9

Where is an ammeter placed to measure current through a component?
  1. In series with the component
  2. In parallel across the component
  3. Across the power supply
  4. Across an open switch

Question 10

Where is a voltmeter placed to measure a component?
  1. In parallel across the component
  2. In series before the component
  3. In series after the component
  4. Across the ammeter

Question 11

What do objects with the same type of charge do?
  1. They repel
  2. They attract
  3. They stay exactly where they are
  4. They exchange charge until both are neutral

Question 12

Which equation links potential difference \(V\), current \(I\) and resistance \(R\)?
  1. \(V = IR\)
  2. \(V = \frac{I}{R}\)
  3. \(V = I + R\)
  4. \(V = \frac{R}{I}\)

Question 13

The potential difference across a fixed resistor is increased from 3 V to 6 V. What happens to the current?
  1. It doubles
  2. It halves
  3. It stays the same
  4. It quadruples

Question 14

A torch uses a \(9\,\mathrm{V}\) battery and a \(3\,\mathrm{\Omega}\) bulb. What current flows?
  1. \(3\,\mathrm{A}\)
  2. \(0.33\,\mathrm{A}\)
  3. \(6\,\mathrm{A}\)
  4. \(9\,\mathrm{A}\)

Question 15

What is electrical charge measured in?
  1. Coulomb (C)
  2. Ampere (A)
  3. Ohm (Ω)
  4. Watt (W)

Question 16

What surrounds a charged object and lets it affect others without touching?
  1. An electric field
  2. A magnetic field
  3. A gravitational field
  4. An electric current

Question 17

Where is the electric field around a charged sphere strongest?
  1. Closest to the sphere
  2. Furthest from the sphere
  3. The same everywhere around it
  4. Only at the top of the sphere

Question 18

What happens when the north poles of two magnets are brought together?
  1. They repel
  2. They attract
  3. Nothing happens
  4. One pole switches to south

Question 19

Which pair of magnetic poles attract each other?
  1. North and south
  2. North and north
  3. South and south
  4. Only unmagnetised ends

Question 20

Which instrument is used to plot the shape of a magnetic field?
  1. A plotting compass
  2. An ammeter
  3. A voltmeter
  4. A thermometer

Question 21

On a field diagram for a bar magnet, which way do the field lines point?
  1. From north to south
  2. From south to north
  3. Towards the centre of the magnet
  4. Straight up from both poles

Question 22

A compass needle settles pointing north. What is it responding to?
  1. Earth’s magnetic field
  2. Earth’s gravity
  3. Earth’s rotation
  4. The position of the Sun

Question 23

Which part of Earth is thought to produce its magnetic field?
  1. The liquid outer core
  2. The solid inner core
  3. The outer atmosphere
  4. The rocky mantle

Question 24

What is produced around a wire when a current flows through it?
  1. A magnetic field
  2. An electric field
  3. A gravitational field
  4. A sound wave

Question 25

Which change makes an electromagnet stronger?
  1. More turns on the coil
  2. Fewer turns on the coil
  3. A smaller current
  4. A plastic core

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Review Electricity and Electromagnetism questions for Physics, with correct answers shown and coverage across current as a flow of charge; potential difference and resistance; series and parallel circuits.

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