Electric current: past paper questions
Real questions on electric current
The newest 20 of 143 written questions. Open one to see it on the real paper.
- 9702/42 · October/November 2025 · Q7c[3]
The alternating voltage is rectified to produce an output voltage across a load resistor R, as shown in Fig. 7.2. rectification circuit V Fig. 7.2 R output voltage Fig. 7.3 shows the variation with t of the power P in the load resistor. 30 P / W 20 10 0 0 25 50 75 t / ms 100 Fig. 7.3 State three conclusions that can be...
See it on the paper → - 9702/52 · October/November 2025 · Q1[6]
Fig. 1.1 shows a model wind turbine with blades, each of length L, placed in moving air. L moving air blade terminals turbine bench Fig. 1.1 The area of the circle swept by the blades of the turbine is A. The output of the turbine has two terminals. The turbine is connected to a resistor of resistance R. At a speed v o...
See it on the paper → - 9702/21 · May/June 2025 · Q3b(iii)[3]
The potential difference (p.d.) across the motor has a constant value of 600 V and the motor has an efficiency of 85%. Calculate the current in the motor. current = A
See it on the paper → - 9702/21 · May/June 2025 · Q3c(ii)[1]
the current in the motor.
See it on the paper → - 9702/21 · May/June 2025 · Q6a(i)[1]
Calculate the current in X. current = A
See it on the paper → - 9702/21 · May/June 2025 · Q6a(ii)[2]
The number density of charge carriers (electrons) in nichrome is 8.5 × 10 28 m −3 . Calculate the average drift speed of the charge carriers in X. average drift speed = m s −1
See it on the paper → - 9702/21 · May/June 2025 · Q6b(i)[2]
the reading on the ammeter
See it on the paper → - 9702/21 · May/June 2025 · Q6b(ii)[1]
the average drift speed of the charge carriers in X.
See it on the paper → - 9702/22 · May/June 2025 · Q6b(i)[2]
Determine the charge passing through the battery in a time of 4.0 minutes. charge = C (i)
See it on the paper → - 9702/23 · May/June 2025 · Q7b(i)[1]
Explain what is meant by a null method.
See it on the paper → - 9702/53 · May/June 2025 · Q2a[1]
A graph is plotted of 1 1 on the y-axis against on the x-axis. I n Determine expressions for the gradient and y-intercept. gradient =
See it on the paper → - 9702/53 · May/June 2025 · Q2b[1]
and I are given in Table 2.1. n Table 2.1 I / μA 5 0.200 455 ± 5 6 0.167 525 ± 5 7 0.143 580 ± 5 8 0.125 635 ± 5 9 0.111 685 ± 5 11 0.0909 765 ± 5 Calculate and record values of 1 / 10 3 A –1 I 1 n 1 1 / 10 3 A –1 in Table 2.1. Include the absolute uncertainties in . n (b) Values of n,
See it on the paper → - 9702/53 · May/June 2025 · Q2c(i)[2]
Plot a graph of 1 1 1 / 10 3 A –1 against . Include error bars for . I n I
See it on the paper → - 9702/53 · May/June 2025 · Q2c(ii)[2]
Draw the straight line of best fit and a worst acceptable straight line on your graph. Label both lines.
See it on the paper → - 9702/21 · October/November 2024 · Q7a(i)[2]
Show that the current I in the circuit is 0.50 A.
See it on the paper → - 9702/22 · October/November 2024 · Q5b(i)[1]
Identify component X.
See it on the paper → - 9702/22 · October/November 2024 · Q5b(ii)[1]
Show that the p.d. across the resistor of resistance 0.86 Ω is 6.0 V.
See it on the paper → - 9702/22 · October/November 2024 · Q5b(iii)[2]
Determine the current I 1 . I 1 = A
See it on the paper → - 9702/22 · October/November 2024 · Q5b(iv)[2]
Calculate the p.d. across component X. p.d. = V
See it on the paper → - 9702/22 · October/November 2024 · Q5b(v)[2]
Calculate the power dissipated in component X. power = W
See it on the paper →
What examiners said
Most candidates successfully recalled that the resistance of an LDR decreases when the light intensity increases.
— Examiner report, October/November 2023, 9702/22 Q6(c)(i) (Cambridge)
This question was usually answered correctly. A common misconception was that there would be no change to the current in the battery.
— Examiner report, October/November 2023, 9702/22 Q6(c)(ii) (Cambridge)
This question was usually answered correctly. The most common incorrect answer was that there would be no change to the reading of the voltmeter.
— Examiner report, October/November 2023, 9702/22 Q6(c)(iii) (Cambridge)
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