The formula for calculating power in an electrical circuit is represented by which expression?

The formula for calculating power in an electrical circuit is represented by the expression P = VI. In this equation, P stands for power (measured in watts), V represents voltage (measured in volts), and I signifies current (measured in amperes). This relationship indicates that power is directly proportional to both the voltage across a circuit and the current flowing through it.

Understanding this formula is crucial for anyone working with electrical systems, as it allows for the assessment of how much electrical energy is being used or transferred in a circuit. Power is a fundamental concept in electrical engineering and is essential for designing circuits that function efficiently and safely.

Other choices provided do not accurately represent the calculation of power. P = R/I, for example, relates resistance and current but does not directly calculate power. Similarly, P = E/R and P = I/R serve different purposes in electrical calculations, focusing on different relationships between electrical quantities rather than the direct calculation of power itself.