Name: _______________________________________________

Unit 2 - Electricity Test

Date:

Time:

Total marks available:

Total marks achieved: ______

Questions
Q1.

A student does an investigation to determine the current-voltage graph for an unknown component, X.

The student uses this equipment

 component X
 cell
 variable resistor
 ammeter
 voltmeter
 connecting wires
(a) Complete the circuit diagram to show how the student should set up this equipment for
her investigation.
(4)

(b) The student completes her investigation.

The table shows her results.
(i) Plot a graph of the student's results on the grid.
Plot current on the y-axis and voltage on the x-axis.
(3)
(ii) Draw a curve of best fit.
(1)
 (iii) State the name of component X.
(1)
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(Total for question = 9 marks)

Q2.

The diagram shows a domestic lighting circuit.

(a) Explain an advantage of using this circuit for domestic lighting.
(2)
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(b) When switch 1 is closed, the current in lamp 1 is 22 mA.

(i) Give the name of the charged particle that moves in an electric current.
(1)
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(ii) Show that lamp 1 has a power of about 5 W.
(3)

(iii) Calculate the energy transferred by lamp 1 when it is on for 30 seconds.

(3)

energy transferred = ........................................................... J

(c) The circuit is connected to the mains supply. Mains voltage is 230 V.
(i) State what is meant by the term voltage.
(1)
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(ii) Switches 1 and 3 are closed, which turn on lamps 1 and 3.
Switch 2 is open.
Calculate the current in the mains supply.
(2)

current = ........................................................... mA

(Total for question = 12 marks)

Q3.

(a) Photograph 1 shows a power supply for some electrical equipment. The electrical
equipment is connected to the mains supply.

Explain why the power supply is completely covered in plastic.

(2)
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(b) The electrical equipment is connected to the mains power supply of 230 V.
(i) State the formula linking power, current and voltage.
 (1)

(ii) The electrical equipment has a power of 350 W.

Calculate the current in the equipment when it is being used.
(2)

current = ........................................................... A

(c) Photograph 2 shows a circuit breaker.

Explain the advantages of using a circuit breaker rather than a fuse.

(2)
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(Total for question = 7 marks)

Q4.

The circuit diagram shows a 9.0 V battery connected in series with a 250 Ω resistor
and another resistor, X.
(a) Draw a voltmeter on the circuit diagram to measure the voltage of resistor X.
(2)
(b) The current in the circuit is 0.012 A.
Calculate the resistance of resistor X.
(4)

resistance = ........................................................... Ω

(Total for question = 6 marks)

Q5.

The diagram shows a circuit that includes a battery, an ammeter, a voltmeter and three
different resistors.
(a) (i) Give the voltmeter reading.
(1)
voltage = ........................................................... V
(ii) State the formula linking voltage, current and resistance.
(1)

(iii) Calculate the resistance of resistor X.

(3)

resistance = ........................................................... Ω

(b) (i) Give the reason why the reading on the ammeter would be 16 mA.
(1)
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(ii) Calculate the resistance of resistor Y.
 (4)

resistance = ........................................................... Ω

(c) Resistor X and the voltmeter are removed from the circuit, leaving a break in this part of
the circuit.
Explain how the current in the battery changes when these components are removed.
(2)
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(Total for question = 12 marks)