ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam with confidence. Study using flashcards and multiple choice questions, each equipped with hints and explanations. Ace your exam with ease!

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What kind of hazard might exist in a power supply when it is turned off and disconnected?

Risk of fire due to faulty wiring
Electric shock from charged stored in large capacitors
Exposure to toxic chemicals
Mechanical failure of components

The correct answer is: Electric shock from charged stored in large capacitors

When a power supply is turned off and disconnected, there can still be a significant hazard present due to the presence of large capacitors within the power supply. These components can retain a substantial charge even after the power supply has been disconnected from its power source. If a person were to accidentally come into contact with the terminals of these charged capacitors, there is a risk of electric shock. This is particularly relevant for power supplies used in high-voltage systems, where capacitors can hold dangerous levels of voltage that can cause serious injury or even be fatal. Safety practices should always be followed when working with or near these components, including discharging capacitors properly and using appropriate personal protective equipment. Understanding this hazard is crucial for anyone working with electronic equipment and ensures proper safety measures are taken to prevent injury.