GCSE OCR Gateway Physics 2.1 Current, Potential Difference & Resistance: A teacher investigates the resis

Question

A teacher investigates the resistance of a filament lamp.

Fig. 17.1 shows the circuit the teacher uses.

**Fig. 17.1**

(a) The teacher takes measurements of the current through the filament lamp and the potential difference across it.

In which position, J, K or L, should the teacher place the ammeter and voltmeter?

Ammeter position: ..................  
Voltmeter position: ..................

(b) Four students discuss the purpose of the component in this circuit.

Student A says: It is used to change the current flowing in the circuit.
Student B says: It is used to change the resistance of the cell.
Student C says: It is used to change the potential difference of the cell.
Student D says: It is used to change the total resistance of the circuit.

Which two students have made a correct statement about the component?

Tick (✓) two boxes.

A  
B  
C  
D

(c) The teacher records their results in the table and plots the graph shown in Fig. 17.2.

| Potential difference (V) | Current (A) |
|------------------------|-------------|
| 0.0                    | 0.0         |
| 2.0                    | 1.6         |
| 4.0                    | 2.4         |
| 8.0                    | 3.6         |
| 10.0                   | 4.0         |

**Fig. 17.2**

(i) Plot the two missing points on Fig. 17.2 and draw a line of best fit.

(ii) Calculate the power dissipated by the filament lamp when the potential difference is 5.0 V.

Use Fig. 17.2 and the equation: power = potential difference × current.

Power = ..................................................... W

(iii) Calculate the energy transferred if the filament lamp is used for 2 minutes.

Use your answer from (b)(ii) and the equation: energy transferred = power × time.

Energy = .............................................................. J

A teacher investigates the resistance of a filament lamp - OCR Gateway - GCSE Physics - Question 17 - 2022 - Paper 1

Worked Solution & Example Answer:A teacher investigates the resistance of a filament lamp - OCR Gateway - GCSE Physics - Question 17 - 2022 - Paper 1

Ammeter position:

Voltmeter position:

Which two students have made a correct statement about the component?

Plot the two missing points on Fig. 17.2 and draw a line of best fit.

Calculate the power dissipated by the filament lamp when the potential difference is 5.0 V.

Calculate the energy transferred if the filament lamp is used for 2 minutes.

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