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CAIE IGCSE Physics Combined Resistance in Series

Practise adding resistances in series, identifying series sections inside mixed networks and using the resulting total with potential difference to find current.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • add series resistances using R_total = R_1 + R_2 + ... before calculating other circuit values
  • reduce a series branch first when a circuit also contains a parallel section or additional resistor
  • use the combined series resistance with V = IR to calculate supply current or an unknown resistor

4.3.2.4—Combined resistance of two or more question 1

[Maximum number: 1]

Fig. 9.1 shows a 12 V battery connected in a circuit containing resistors A, B, C and D. Each resistor has a resistance of 6.0Ω6.0 \Omega.

Fig. 9.1

Fig. 9.1

Calculate the combined resistance of

resistors A and B ,
resistance =

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