February/March 2026 Paper 22

2026 · 7 questions · 42 parts · 60 marks

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6(a)Current Potential DifferenceEasy1 mark
State what is meant by an electric current.
6(b)Emf Internal ResistanceMedium2 marks
A cell has electromotive force (e.m.f.) 1.50 V and internal resistance 0.75 . On Figure 6.1, draw the variation of the terminal potential difference (p.d.) with current in the cell for current between 0 A and 1.6 A.
Diagram to annotate
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Draw with the mouse or a finger.
6(c)
A metal wire X has length 6.8 m and cross-sectional area m. The resistance of the wire is 0.82 .
The wire is connected to a circuit containing the cell in 6(b) and a fixed resistor of resistance , as shown in Figure 6.2.
Figure 6.2, a circuit diagram with a cell of e.m.f. 1.50 V and internal resistance 0.75 $\Omega$ (shown in a dashed box), its output current on the left-hand wire labelled 1.8 A, connected to a fixed resistor R in parallel with wire X of resistance 0.82 $\Omega$
The current in the cell is 1.8 A.
6(c)(i)Resistance ResistivityMedium2 marks
Calculate the resistivity of the metal from which wire X is made.
6(c)(ii)Emf Internal ResistanceMedium3 marks
Calculate .
6(c)(iii)Emf Internal ResistanceMedium2 marks
Calculate the power dissipated in the internal resistance of the cell.

Answer