Red Seal Industrial Electrician Practice Exam

How is 'phantom load' defined in electrical terms?

1. The power consumption of active devices

2. The energy consumed by devices when turned off but still plugged in

3. The total load capacity of an electrical circuit

4. The energy used by devices only when in standby mode

The correct answer is: The energy consumed by devices when turned off but still plugged in

In electrical terminology, 'phantom load' refers to the energy consumed by devices when they are turned off but remain plugged into a power source. This phenomenon occurs because many electronic devices still draw a small amount of power to maintain functions such as timers, remote control receivers, or maintain a state of readiness, even though the device is not actively in use. Recognizing phantom loads is crucial for energy efficiency and helps in minimizing unnecessary energy expenses. By unplugging devices or using power strips that can cut off power when the devices are not in use, individuals can reduce their overall energy consumption significantly. This understanding emphasizes the importance of mindful energy use, particularly in residential settings where many devices may represent cumulative phantom loads, leading to higher utility bills without any apparent increase in usage. Knowing this concept can help electricians and consumers alike identify areas for energy savings and make informed decisions about device usage.