P6 - Electric circuits

At which point in the circuit – A, B, C or D – should an ammeter be placed to measure the total current flowing through this circuit?

• A

• B

• C

• D

Which of the following options best describes this circuit?

• A source in parallel with an ammeter, switch and a variable resistor.

• A source in series with an ammeter, switch and an LDR.

• A source in series with an ammeter, switch and a variable resistor. 

• A voltmeter in series with an ammeter, switch and a variable resistor.

Calculate the e.m.f. of the source labelled X. Include the unit with your answer.

Three resistors of 7 Ω are each arranged in parallel. Calculate the effective total resistance of the parallel circuit. Give your answer to 2 decimal places and do not include the unit.

Complete the following sentence: When multiple sources are connected together, their total e.m.f. will be equal to the sum of their individual e.m.fs if they are placed in _________. 

• Series

• Parallel

State the value of the current flowing through ammeter A shown in the circuit. Include the unit in your answer.

In the circuit diagram, where should another switch be placed so that both lamps can be turned on or off independently?

• A

• B

• C

• D

As temperature changes in the circuit, the brightness of the bulb is seen to change. Which of the following components is inside the box labelled X?

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A circuit is designed to turn on a heater as temperature decreases. In the circuit diagram, should a thermistor replace resistor X or resistor Y?

• It could replace either X or Y

• It should replace X

• It should replace Y

• It will not work whether it replaces X or Y

Which of the following circuit diagrams correctly shows the circuit needed to measure the current through and the voltage across a resistor?

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