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

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

• A. To increase the voltage for long-distance transmission
• B. To convert the voltage to a voltage that is safe to plug devices into
• C. To store electrical energy
• D. To measure current

Answer: (B)

The main idea being tested is how voltage is changed in power distribution to enable efficient delivery and safe use. A transformer adjusts voltage levels by electromagnetic induction. For long-distance transmission, stepping up the voltage reduces the current for the same transmitted power, which lowers resistive losses in the lines (I^2R losses). Then, as electricity nears homes and devices, other transformers step the voltage down to safe, usable levels. So the primary purpose is to change voltage to appropriate levels for efficient transmission and practical use. Energy storage or current measurement aren’t functions of a transformer.

The main idea being tested is how voltage is changed in power distribution to enable efficient delivery and safe use. A transformer adjusts voltage levels by electromagnetic induction. For long-distance transmission, stepping up the voltage reduces the current for the same transmitted power, which lowers resistive losses in the lines (I^2R losses). Then, as electricity nears homes and devices, other transformers step the voltage down to safe, usable levels. So the primary purpose is to change voltage to appropriate levels for efficient transmission and practical use. Energy storage or current measurement aren’t functions of a transformer.