A student uses this circuit to investigate how the current in a filament lamp varies with the potential difference (voltage) across the lamp - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1
Question 5
A student uses this circuit to investigate how the current in a filament lamp varies with the potential difference (voltage) across the lamp.
(a) Add a voltmeter to... show full transcript
Worked Solution & Example Answer:A student uses this circuit to investigate how the current in a filament lamp varies with the potential difference (voltage) across the lamp - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1
Step 1
Add a voltmeter to the circuit that can be used to measure the potential difference (voltage) across the lamp.
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Answer
The voltmeter should be added in parallel with the lamp in the circuit.
Step 2
Complete the sentence by putting a cross (×) in the box next to your answer.
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Answer
A 12 joules per coulomb
Step 3
When the variable resistor is at the halfway position, show that the resistance of the filament in the lamp is about 11 Ω.
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Answer
Using Ohm's law, we know that resistance (R) can be calculated using the formula:
R=IV
Substituting the values:
R=0.374.0
Calculating the above gives,
R≈10.81Ω
Therefore, the resistance of the filament in the lamp is approximately 11 Ω.
