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 correct choice for controlling brightness is D a variable resistor. A variable resistor allows for adjustment of the current passing through the lamp, thereby controlling its brightness.
Step 2
Add a voltmeter to the circuit which will measure the potential difference (voltage) across the lamp.
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Answer
To add a voltmeter, place it in parallel with the lamp in the circuit diagram. This configuration ensures that the voltmeter measures the voltage across the lamp while allowing the rest of the circuit to function correctly.
