An inventor is designing a battery-powered torch. She wants the torch to have a brightness control. (a) Which of these could she use in this control? Put a cross (✗) in the box next to your answer. ☐ A a diode ☐ B a light-dependent resistor ☐ C a thermistor ☐ D a variable resistor (b) She builds this circuit to test the lamp in the torch. (i) Add a voltmeter to the circuit which will measure the potential difference (voltage) across the lamp.

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An inventor is designing a battery-powered torch - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1

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An inventor is designing a battery-powered torch. She wants the torch to have a brightness control. (a) Which of these could she use in this control? Put a cross (✗... show full transcript

Worked Solution & Example Answer:An inventor is designing a battery-powered torch - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1

Step 1

Which of these could she use in this control?

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The best option for brightness control is D, a variable resistor. This component allows for adjusting the resistance, which in turn can modify the current flowing through the circuit, effectively controlling the light output.

Step 2

Add a voltmeter to the circuit which will measure the potential difference (voltage) across the lamp.

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Answer

To measure the voltage across the lamp, the voltmeter should be connected in parallel with the lamp in the circuit diagram.

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An inventor is designing a battery-powered torch - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1

Worked Solution & Example Answer:An inventor is designing a battery-powered torch - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1

Which of these could she use in this control?

Add a voltmeter to the circuit which will measure the potential difference (voltage) across the lamp.

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