Red Seal Powerline Technician Practice Exam

What is the purpose of a transformer in a power distribution system?

1. To convert AC to DC

2. To change voltage levels for safe distribution

3. To store electrical energy

4. To increase electrical resistance

The correct answer is: To change voltage levels for safe distribution

The primary purpose of a transformer in a power distribution system is to change voltage levels for safe distribution. Transformers facilitate the efficient transport of electrical energy over long distances by stepping up the voltage for transmission, which reduces energy losses in the form of heat due to resistance in the conductors. At the point of use, another transformer steps down the voltage to a safer level suitable for consumer use. This process is essential for maintaining system efficiency, reducing costs, and ensuring safety for both users and equipment. By adjusting voltage levels, transformers enable the distribution of electricity to be managed efficiently. This adaptability allows utilities to match voltage levels to different requirements as power moves from generation points to end users, ensuring that power can be distributed effectively across varying distances and consumption needs.