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CAIE IGCSE Physics 4.3.2.6 Combined Resistance of Two Resistors Questions

Learn that a parallel combination has lower resistance than either branch and changes total current.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • state that two-resistor parallel resistance is less than either resistor
  • predict current changes when a parallel branch is added or removed
  • predict lamp brightness changes after changing a parallel route

CAIE IGCSE Physics 4.3.2.6 Combined Resistance of Two Resistors Questions question 1

[Maximum number: 2]

Fig. 8.1 shows a circuit that contains a battery of electromotive force (e.m.f.) 6.0 V , an ammeter, a 20Ω20 \Omega resistor and component X .

Fig. 8.1

Fig. 8.1

Question (a)

(a)

A second resistor is connected into the circuit in parallel with the 20Ω20 \Omega resistor.

[ 2 ]

Question (i)

(i)

State how the combined resistance of the two resistors in parallel compares with the resistance of each of the resistors on its own.

[ 1 ]

Question (ii)

(ii)

The p.d. across the two parallel resistors is changed and the current in the battery for each value of the p.d. is measured. A second line could be drawn on Fig. 8.2 to indicate how the current measured by the ammeter depends on the p.d. across the two resistors in parallel.

State how the second line differs from the original line. You are not expected to draw this second line.

[ 1 ]
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