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

Electrical power (P), measured in watts, is the rate at which electrical energy is transferred by an electric circuit. The fundamental formula to calculate power in a DC circuit is P = I x E, where "I" represents current in amperes and "E" represents voltage (electromotive force) in volts. This formula is frequently remembered by the mnemonic "PIE" (P = I x E). It tells us that power is directly proportional to both the current flowing through the circuit and the voltage pushing it. Other formulas like P = E / I or P = I / E are mathematically incorrect for power calculations. While P = I^2 x R is another valid way to calculate power using resistance, the distractor P = I^2 x E is completely fictitious.