What is the formula used to calculate electrical power (P) in a DC circuit?

In electrical circuits, Power (P) is the rate at which electrical energy is used or generated. It is calculated by multiplying the Current (I), measured in amperes, by the Voltage or Electromotive Force (E), measured in volts. This vital relationship is easily remembered by the memory trick 'PIE' (P = I × E). Understanding this formula is essential for calculating how much energy a station's equipment will consume or how much RF power a transmitter will output. The other options describe incorrect mathematical operations, such as division, subtraction, or addition, which do not calculate power.