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Electric Power Measurement

Reference data and engineering information about electric power measurement for electrical applications.

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Overview

Engineering reference data for Electric Power Measurement in electrical engineering.

Key Formulas

Ohm's Law

V=IRV = IR

Voltage = Current × Resistance.

Power

P=VI=I2R=V2/RP = VI = I^2R = V^2/R

Electrical power.

Energy

E=PtE = Pt

Energy = Power × Time.

Variables

Symbol Description Unit
VV Voltage V
II Current A
RR Resistance Ω
PP Power W

Power Measurement Methods

Electric power in a DC or single-phase AC circuit can be determined by measuring the voltage and current. Two common instruments are used:

  • Voltmeter (V): Measures the potential difference (voltage) across a component.
  • Ammeter (A): Measures the current flowing through the circuit.

By measuring voltage (U) and current (I), power can be calculated using the relationship P = U × I.

Practical Calculation Example

Consider a household circuit with an electric heater:

  • Circuit Voltage (U): 230 V
  • Measured Current (I): 8 A

Using the formula P = U × I: P = 230 V × 8 A = 1840 W

This means the heater consumes 1840 watts of electric power.

References