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Edexcel A-Level Physics AS 2.4.69 Electrical Power and Energy Questions

Practise Edexcel A-Level Physics electrical power and energy with P = VI, resistor dissipation, solar-cell circuits and kWh calculations.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
AS

Exam points

  • calculate power dissipated using P = VI, P = I²R or P = V²/R in resistor circuits
  • draw ammeter-voltmeter circuits to determine solar-cell power output from V and I
  • assess electrical energy use with power, time and kWh percentage comparisons

Edexcel A-Level Physics AS 2.4.69 Electrical Power and Energy Questions question 1

[Maximum number: 3]

Drivers use car headlights to emit light in dark conditions.
The graph shows how current I varies with potential difference V for a car headlight.

Figure for Question Edexcel A-Level Physics AS 2.4.69 Electrical Power and Energy Questions question 1 — Edexcel A-Level Physics AS

The headlight will emit light when it dissipates at least 35 W of power.

Determine the minimum potential difference for which the headlight will emit light.
(3)

Minimum potential difference = V

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