Discussion
Consider the following statements about an electrical audit.
1. The demand charge depends on the peak rather than the total 2. Transformer efficiency is greatest at full load 3. Cable loss varies as the square of the current
Answer: A
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: the demand charge is levied on the peak interval rather than the total energy, and cable loss is \( I^2R \). Statement 2 is wrong - efficiency peaks where the copper loss equals the iron loss, which for a typical distribution transformer is somewhere between a third and three quarters of full load, not at full load.
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