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