An electrical power calculator is an essential tool for determining the power consumption of electrical devices. By inputting values such as voltage (V), current (I), and resistance (R), users can calculate power (P) using formulas derived from Ohm's Law. The basic formula is P = V × I, which calculates power in watts. For direct current (DC) circuits, this formula applies directly. In alternating current (AC) circuits, especially those with reactive components, calculations may also involve the power factor to account for phase differences between voltage and current. Utilizing an electrical power calculator ensures accurate assessments of energy usage, aiding in efficient electrical system design and energy management.