IBEW Electrical Practice Test 2025 – Complete Exam Preparation

Question: 1 / 400

What is a common application of a photocell in lighting systems?

To provide emergency backup power

To monitor energy consumption

To automatically turn lights on at dusk and off at dawn

A common application of a photocell in lighting systems is its ability to automatically turn lights on at dusk and off at dawn. Photocells, also known as light sensors, work by detecting ambient light levels. When the light level falls below a certain threshold, typically at dusk, the photocell signals the lighting system to turn on. Conversely, when the light levels rise above the threshold at dawn, it turns the lights off.

This automation enhances energy efficiency, as lights are only used when necessary, helping to reduce electricity usage and costs. It’s particularly useful for outdoor lighting, such as streetlights and landscape lighting, where manual operation would be impractical and could lead to wasted energy.

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To control the brightness of lights

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