In the transfer of electrical energy over power lines, it is desirable to minimize Joule heating. Therefore it is desirable to reduce the
A) resistance.
B) voltage.
C) current.
D) both (a) and (c).

Question

Quizplus · Accepted Answer

Joule heating is directly proportional to the resistance of the conductor and the square of the current flowing through it, as described by the formula P = I^2R, where P is the power (heat generated), I is the current, and R is the resistance. Therefore, reducing both resistance and current can help minimize Joule heating. Reducing voltage is not directly related to minimizing Joule heating in this context, as higher voltage can actually be used to reduce current for a given power transmission, which in turn reduces Joule heating.

In the Transfer of Electrical Energy Over Power Lines, It