May/June 2026 Paper 23

2026 · 5 questions · 39 parts · 60 marks

0/60 marks

0Correct0Partial0Wrong39Unattempted

Filters0 active

Questions

Select a part to jump to its question

4(a)Emf Internal ResistanceMedium3 marks

A light-dependent resistor (LDR) is connected across the terminals of a cell that has internal resistance. A voltmeter is connected across the LDR.

Draw a circuit diagram to show this arrangement.

Draw with the mouse or a finger.

4(b)

The cell has an electromotive force (e.m.f.) of 4.90 V.

At a particular light intensity, the LDR has a resistance of 230

Ω

and a potential difference (p.d.) across it of 4.78 V.

4(b)(i)Measurement Uncertainty ErrorEasy1 mark

Identify one possible source of systematic error in measuring the p.d. across the LDR using a digital voltmeter.

Answer

4(b)(ii)Electrical Power Energy Domestic ElectricityEasy2 marks

Calculate the power dissipated in the LDR.

4(b)(iii)Emf Internal ResistanceEasy2 marks

Determine the internal resistance of the cell.

4(b)(iv)Emf Internal ResistanceMedium3 marks

The intensity of the light illuminating the LDR is gradually decreased.

By placing one tick in each row, complete Table 4.1 to show what happens to the quantities indicated as the light intensity decreases.

resistance of LDR

current in cell

p.d. across LDR