The Formula For Calculating Power Is
Mathematically, power is defined as the amount of work done or energy transferred divided by the time it takes. It is expressed in units of watts (W) in the International System of Units (SI), where 1 watt equals 1 joule of energy per second. Electric power is the rate at which electrical energy is transferred.
The formula is Power = Current Voltage: Power (P) is measured in Watts (W), Current (I) is measured in Amps (A), and Voltage (V) is measured in Volts (V). It takes both Current and Voltage to create Power! Complete power formulas for DC, single-phase AC, and three-phase systems with power factor, kW/kVA/HP conversions, and worked examples.
In the International System of Units, the unit of power is the watt (symbol W), equal to one joule per second (J/s). Power is a scalar quantity. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft.
Power is calculated by dividing work (or energy) by time: Power = Work Time. In SI units, power is measured in watts, where one watt equals one joule of energy transferred per second. In the SI system, power is given in watts (W), which is energy per unit time, or J/s.
W = J s. Recall now that a voltage is the potential energy per unit charge, which means that voltage has units of J/C. We can rewrite this equation as J = V C J = V C and substitute this into the equation for watts to get.
W = J s = V C s = V C s. Power is calculated using the formula: P = E t P = tE. where, t is the time taken (in seconds).
Since energy is measured in joules and time in seconds, power is measured in: 1Watt=1 Joule/second. Average Power is defined as the total work done divided by the total time taken. The Power Formula defines the rate at which work is done or energy is transferred, expressed as P = W/t, where P is power in Watts, W is work in Joules, and t is time in seconds.
As electrical power is the product of V*I, the power dissipated in a circuit is the same whether the circuit contains high voltage and low current or low voltage and high current flow. Weve seen the formula for determining the power in an electric circuit: by multiplying the voltage in volts by the current in amps we arrive at an answer in watts.
