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GCSEPhysicsOCRPhysics A (Gateway)Exam Questions3. ElectricityStatic & Charge

Static & Charge (OCR GCSE Physics A (Gateway))

Exam Questions

58 mins15 questions

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Static & Charge

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Static & Charge

1a2 marks

A student uses four electrical appliances for different lengths of time.

Look at the table.

Appliance

Power (W)

Time used (hours)

Hair dryer

1500

0.3

TV

100

5

Toaster

2000

0.2

Light blub

10

12

i) Which appliance uses the most energy?

 [1]

ii) Which appliance uses the least energy?

[1]

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1b2 marks

Here are three different components and their use in the home.

Match the component to its correct use.

One has been done for you.

q16b-paper1-june2018-ocr-gcse-physics

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1c4 marks

A charge of 44 000 C flows through a light bulb. The potential difference is 230 V.

Calculate the energy transferred.

Use the equation: Charge = Energy ÷ Potential difference

Record your answer to 2 significant figures.

Answer = ...................................................... J 

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1d3 marks

i) A student has completed her homework on static electricity.

Look at her homework.

1  Static charge only builds up on insulators.

2     Opposite charges attract.

3     Like charges repel.

4     Only positive charges can move.

Identify the student’s mistake and correct it.

[2]

ii) When charges move, a current flows.

q16dii-paper1-june2018-ocr-gcse-physics

Write down the current flowing at point Y in the circuit.

Answer = .......................................................A [1]

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2a3 marks

This question is about electrostatic charges.

A charged rod is brought towards a gentle stream of water from a tap.

q18-paper3-june2018-ocr-gcse-physics

Explain how the charged rod affects the stream of water.

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2b6 marks

i) Write down the conditions needed for charge to flow through a conductor.

[2]

ii) Calculate the charge that flows past a point in a circuit with a 5.0 A current for five minutes.

Answer = ......................... C [4]

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3a4 marks

A student investigates static electricity using a plastic ruler.

i) Explain in terms of electrons why the plastic ruler is not normally charged.

[2]

ii) Explain in terms of electrons why the ruler becomes charged when the student rubs it with a cloth.

[2]

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3b4 marks

The diagram shows the electric field between two charges, A and B.

q16b-paper3-oct-nov2020-ocr-gcse-physics

i) State the charges of A and B.

Use the diagram to explain your answer.

[3]

ii) Describe one similarity between the electric field line diagram and a magnetic field line diagram.

[1]

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3c3 marks

Calculate the charge when 200 J of energy is transferred with a potential difference of 40 V.

Use the equation: energy transferred = charge × potential difference

 Charge = ..................................................... C 

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4a6 marks

A student rubs a balloon against a scarf.

q17-paper3-specimen-ocr-gcse-physics

Describe how the balloon becomes charged.

Suggest how you could show that the balloon is charged.

What would you expect to see and why?

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4b3 marks

Current is the rate of flow of electrical charge in a circuit.

A current of 40 mA transfers a charge of 3.6 C.

Calculate the time to transfer this charge.

Show your working.

Answer = ......................... seconds 

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5a2 marks

The diagram shows an electrostatic dust precipitator used in a chimney.

Diagram of a chimney with smoke particles travelling upwards through a negatively charged metal grid, and sticking to the surface of positively charged metal collectors at the top of the chimney.

Electrostatic dust precipitators remove smoke particles from gaseous emissions produced by factories. The initially neutral smoke particles move up the chimney, through the metal grid, and are then captured by the collector plates.

Explain why the smoke particles are initially neutral.

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5b2 marks

The current in the collector plates is 3.6 A when in active use. Determine the time taken for the collector plates to receive 1080 C of charge.

Use the equation: charge space flow space equals space current space cross times space time

How did you do?

5c
Sme Calculator4 marks

Describe how the smoke particles are used as charge carriers to complete the circuit in the electrostatic dust precipitator.

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