A student investigated how the current in a filament lamp varied with the potential difference across the filament lamp. Figure 1 shows part of the circuit used. Complete Figure 1 by adding an ammeter and a voltmeter. Use the correct circuit symbols. The student reversed the connections to the power supply and obtained negative values for the current and potential difference. Draw a line on Figure 2 to show the relationship between the negative values of current and potential difference. Write down the equation which links current (I), potential difference (V) and resistance (R). Determine the resistance of the filament lamp when the potential difference across it is 1.0 V. Use data from Figure 2.

GCSE AQA Physics Series & Parallel Circuits: A student investigated how the c

A student investigated how the current in a filament lamp varied with the potential difference across the filament lamp - AQA - GCSE Physics - Question 1 - 2020 - Paper 1

Question 1

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A student investigated how the current in a filament lamp varied with the potential difference across the filament lamp. Figure 1 shows part of the circuit used. C... show full transcript

Worked Solution & Example Answer:A student investigated how the current in a filament lamp varied with the potential difference across the filament lamp - AQA - GCSE Physics - Question 1 - 2020 - Paper 1

Step 1

Complete Figure 1 by adding an ammeter and a voltmeter.

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Answer

To complete Figure 1, add an ammeter in series with the filament lamp, and a voltmeter in parallel with the filament lamp. Use the correct circuit symbols:

Ammeter: A circle with 'A' inside it and a straight line representing the wire.
Voltmeter: A circle with 'V' inside it and two lines connecting across the filament lamp.

Step 2

Draw a line on Figure 2 to show the relationship between the negative values of current and potential difference.

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Answer

To show the relationship in Figure 2, draw a smooth, curved line that connects the negative values of potential difference and current. The line should reflect the trend, passing through points like (-4.0 V, -0.2 A) and (-6.0 V, -0.23 A). Ensure that the line does not become horizontal.

Step 3

Write down the equation which links current (I), potential difference (V) and resistance (R).

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Answer

The equation that links current (I), potential difference (V) and resistance (R) is given by:

$V = I \times R$

Step 4

Determine the resistance of the filament lamp when the potential difference across it is 1.0 V.

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Answer

From Figure 2, when the potential difference, V = 1.0 V, the current, I = 0.08 A.

Using the equation:

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

Substituting the values:

$R = \frac{1.0 \text{ V}}{0.08 \text{ A}} = 12.5 \Omega$

A student investigated how the current in a filament lamp varied with the potential difference across the filament lamp - AQA - GCSE Physics - Question 1 - 2020 - Paper 1

Worked Solution & Example Answer:A student investigated how the current in a filament lamp varied with the potential difference across the filament lamp - AQA - GCSE Physics - Question 1 - 2020 - Paper 1

Complete Figure 1 by adding an ammeter and a voltmeter.

Draw a line on Figure 2 to show the relationship between the negative values of current and potential difference.

Write down the equation which links current (I), potential difference (V) and resistance (R).

Determine the resistance of the filament lamp when the potential difference across it is 1.0 V.

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