Electric Energy Measurement Power Expression

The expressions of Energy power meter mainly include the following:

Basic expression of power for energy measurement:

P = W/t: This is the definition of power, which represents the work done per unit time and is applicable to any circuit. Among them, P represents power, W represents electric energy (work), and t represents time.

Specific application expressions in circuits:

P = UI: This is the empirical formula of power, which represents the product of the voltage across the conductor and the current passing through the conductor, and is also applicable to any circuit. Among them, U represents voltage and I represents current.

P = I²R and ‌P = U²/R: These two formulas are compound formulas and are only applicable to pure resistance circuits. Among them, R represents resistance. P = I²R is applicable to the case of known current and resistance, while P = U²/R is applicable to the case of known voltage and resistance.

These expressions have different applications in different circuit situations, but they are all very important in energy measurement. In practical applications, appropriate formulas should be selected for calculation based on specific circuit parameters and known conditions.