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IB Physics SL B.5.5 Electrical power Question Bank

Practise IB Physics SL B.5.5 by applying P=IV, I²R and V²/R to circuits, motors, lamps and cable losses.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • Choose P=IV, I²R or V²/R from the circuit constraint and calculate power in components.
  • Use efficiency, resistance and current to determine motor output, lamp limits and electrical energy loss.

B.5.5—Electrical power question 1

[Maximum number: 2]

Part 2 Electric current and resistance
The graph below shows how the current I in a tungsten filament lamp varies with potential difference V across the lamp.

Figure for Question B.5.5—Electrical power question 1 — IB Physics SL

Two identical filament lamps are connected in series with a cell of emf 6.0 V and negligible internal resistance. Using the graph on page 26, calculate the total power dissipated in the circuit.

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