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 the circuit that can be used to measure the potential difference (voltage) across the lamp. (b) Complete the sentence by putting a cross (×) in the box next to your answer. The 12 V electrical supply transfers ☐ A 12 joules per coulomb ☐ B 12 coulombs per joule ☐ C 12 joules per ohm ☐ D 12 volts per amp (c) When the variable resistor is at the halfway position, the ammeter reads 0.37 A and the voltmeter reads 4.0 V. Show that the resistance of the filament in the lamp is about 11 Ω.

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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

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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:

$R = \frac{V}{I}$

Substituting the values: $R = \frac{4.0}{0.37}$

Calculating the above gives, $R \approx 10.81 \, \Omega$

Therefore, the resistance of the filament in the lamp is approximately 11 Ω.

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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

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

Add a voltmeter to the circuit that can be used to measure the potential difference (voltage) across the lamp.

Complete the sentence by putting a cross (×) in the box next to your answer.

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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