Electrician Red Seal · Question
During a routine inspection, a journeyperson notices erratic operation of a photocell-controlled outdoor lighting circuit. Using a digital multimeter, they measure the ambient light level output of the photocell. Which function of the multimeter is most appropriate for this measurement?
Most photocells used for lighting control are photoresistive devices, meaning their resistance changes with light intensity. To test their function directly rel
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Question: During a routine inspection, a journeyperson notices erratic operation of a photocell-controlled outdoor lighting circuit. Using a digital multimeter, they measure the ambient light level output of the photocell. Which function of the multimeter is most appropriate for this measurement?
Answer options:
- Voltage (VDC) ✅ Resistance (Ω)
- Capacitance (F)
- Continuity
Correct answer: Resistance (Ω)
Explanation: Most photocells used for lighting control are photoresistive devices, meaning their resistance changes with light intensity. To test their function directly related to ambient light, measuring the resistance (Ω) of the photocell is the most appropriate method. As light increases, the resistance of a common photocell decreases.
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