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Uy8Oxford Cambridge and RSA
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AS-Level OCR 2025 Physics B Paper 2
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Wednesday 21 May 2025 – Afternoon
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AS Level
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Physics B (Advancing Physics) H157/02
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Physics in depth
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Time allowed: 1 hour 30 minutes
1
Turn over
, 2
Section A
1 A student carries out an experiment to determine the electromotive force (e.m.f.) and the internal
resistance of a cell. Fig. 1.1 shows the circuit the student uses.
Fig. 1.1
A V
The student changes the resistance of the variable resistor and measures corresponding values
of current through and potential difference across the variable resistor.
The graph in Fig. 1.2 shows the student’s results.
Fig. 1.2
1.60
1.50
1.40
1.30
Potential
difference 1.20
/V
1.10
1.00
0.90
0.80
0.00 0.10 0.20 0.30 0.40 0.50
Current / A
© OCR 2025
, 3
(a) The student concludes that the e.m.f. of the cell is 1.5 V and that its internal resistance is 1.2 Ω.
Explain how the student reaches these conclusions. Include any relevant calculations.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [4]
(b)
(i) Show that when the current is 0.40A the number of electrons passing through the variable
resistor each second is 2.5 × 1018.
[2]
(ii) Calculate the energy transferred by one electron as it travels from one end of the variable resistor
to the other when the current is 0.40A.
Energy transferred = ...................................................... J [3]
© OCR 2025 Turn over
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Uy8Oxford Cambridge and RSA
U6tgv ytty7u u678yb y5678 y7uhcrdcb yt567b j98765tcv trerefdfy765dcvhbm ftyukncxtfyukm jytrcrghkmn
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AS-Level OCR 2025 Physics B Paper 2
Ytrsdfb tyuh 8765r jvcs45rfc kjhgf trtyh kuyt56yv iuyt4dc jhg6c yub ytf6ij 7876xc tr56ub 9876tc 876 fghjb
Thf vffgyf sjchdbbd fdffyujs cckssudysv svcvbs sdsydsd7yde shdsyhsj sskdusydgd sd sshdsdvs ddw7ewe
Wednesday 21 May 2025 – Afternoon
Ghvxc z zxjuzyt zxkzuxyztcfx zjh
AS Level
7trgyebfsdus dsndsdg bdusd7wydg sds
Physics B (Advancing Physics) H157/02
7tgfbdf djydvs dsgsusv susyfgs ssi88 e
Physics in depth
Ufgdv sdd8w7ewev wwuddx 8e3 23454
Time allowed: 1 hour 30 minutes
1
Turn over
, 2
Section A
1 A student carries out an experiment to determine the electromotive force (e.m.f.) and the internal
resistance of a cell. Fig. 1.1 shows the circuit the student uses.
Fig. 1.1
A V
The student changes the resistance of the variable resistor and measures corresponding values
of current through and potential difference across the variable resistor.
The graph in Fig. 1.2 shows the student’s results.
Fig. 1.2
1.60
1.50
1.40
1.30
Potential
difference 1.20
/V
1.10
1.00
0.90
0.80
0.00 0.10 0.20 0.30 0.40 0.50
Current / A
© OCR 2025
, 3
(a) The student concludes that the e.m.f. of the cell is 1.5 V and that its internal resistance is 1.2 Ω.
Explain how the student reaches these conclusions. Include any relevant calculations.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [4]
(b)
(i) Show that when the current is 0.40A the number of electrons passing through the variable
resistor each second is 2.5 × 1018.
[2]
(ii) Calculate the energy transferred by one electron as it travels from one end of the variable resistor
to the other when the current is 0.40A.
Energy transferred = ...................................................... J [3]
© OCR 2025 Turn over
