Starter quiz
- An object becomes positively charged by friction. Which of the following explains how this happens?
- It gains protons.
- It gains electrons.
- It loses protons.
- It loses electrons. ✓
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- How many of the following types of particle can an object gain or lose when it is rubbed against another object: electrons, protons, neutrons?
- none of them
- one ✓
- two
- three
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- Which of the following statements about electric field lines are correct?
- The arrows show the direction of force on a negative charge.
- The arrows show the direction of force on a north-seeking pole.
- The lengths of the field lines show the strength of the field.
- The field is stronger where the lines are closer together. ✓
- The field lines around a spherical charge are radial. ✓
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- Which of the following statements about the arrows on electric field lines are correct?
- They point towards a positively–charged object.
- They point away from a positively–charged object. ✓
- They point towards a negatively–charged object. ✓
- They point away from a negatively–charged object.
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The diagram shows a Van de Graaff generator. After the generator is switched on, which of the following happen?- Part A moves and rubs against rollers.
- Part B moves and rubs against rollers. ✓
- The part that builds up the largest charge is part A. ✓
- The part that builds up the largest charge is part B.
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- Speed, distance and time are related by the equation: speed = distance ÷ time. Which of the following are correct rearrangements of this equation?
- distance = speed × time ✓
- distance = speed ÷ time
- time = distance ÷ speed ✓
- time = speed × distance
- time = speed ÷ distance
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Exit quiz
- Which of the following is a definition of electric current?
- the distance travelled by an electron in one second
- the number of electrons that flow past a point each second
- the time taken for one coulomb of charge to flow past a point
- the number of coulombs of charge that flow past a point each second ✓
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- A battery makes a current flow in a circuit. Which of the following statements about the electric field in the circuit are correct?
- There is an electric field around the wires only.
- There is an electric field around the battery only.
- There is an electric field around the battery and the wires. ✓
- The electric field exerts equal forces on all of the electrons in the wires. ✓
- The electric field exerts the greatest force on electrons nearest the battery.
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- Which of the following statements is correct?
- The charge on one electron is much less than one coulomb. ✓
- The charge on one electron is one coulomb.
- The charge on one electron is much more than one coulomb.
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- If 12 coulombs (C) of charge flows in 2 seconds (s), the current is ______ amps (A).
- '6' ✓
- A current of 6 A flows in a circuit. The amount of charge that flows past in 3 s is ______ C.
- '18' ✓
- A current of 0.50 A flows in a circuit. The time taken for 12 C of charge to flow past a point in the circuit is ______ s.
- '24' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Two unlike electric charges attract each other.
- Two like electric charges repel each other.
- In an electric circuit, electrons are forced towards the positive terminal of a battery.
- Electric current is the amount of charge that passes a point in a circuit in each second.
- Current can be found using the equation: current = charge ÷ time.
Common misconception
Magnetic field effects are often mistaken for electric field effects.
Be explicit in teaching that electric charges and charged objects are not magnetic.
Keywords
Van de graaff generator - A device that produces electric charge and is used in electrostatic experiments.
Charge - An electrical property; it can either be positive or negative.
Electric field - The invisible field around a charged object that causes another charged object to experience a force.
Coulomb - The unit of electric charge.
Ampere - The unit of electric current.
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