Physics 0625 · IGCSE · Electric circuits

Electric circuits — practice question

The diagram shows a series circuit that includes a fixed voltage power supply, a thermistor, a light-dependent resistor (LDR) and a lamp. Which set of conditions makes the lamp the brightest?

  • Alight intensity shining on LDR: bright; temperature of thermistor: high
  • Blight intensity shining on LDR: bright; temperature of thermistor: low
  • Clight intensity shining on LDR: dim; temperature of thermistor: high
  • Dlight intensity shining on LDR: dim; temperature of thermistor: low

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