When a car's starter motor is operated, the headlights dim because:

  1. the headlights are disconnected
  2. the motor produces light
  3. the battery's e.m.f. increases
  4. the large current causes a big p.d. across the battery's internal resistance
Answer

D) the large current causes a big p.d. across the battery's internal resistance

Terminal p.d. drops. SLO P-09-E-26 · Understanding

Physics MCQ · More Current Electricity MCQs · Practise