Power Voltage Equation

In physics power is the amount of energy transferred or converted per unit time.

Power voltage equation. Learn the power formula. And that equation was nothing but the voltage equation of the motor. How to use ohm s law to determine current. Power formula 1 electrical power equation.

Power p i v r i 2 v 2 r where power p is in watts voltage v is in volts and current i is in amperes dc. To get the result in watts work must be expressed in joules and time must. By multiplying the voltage in volts by the current in amps we arrive at an answer in watts let s apply this to a circuit example. 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 equation of a dc motor. We have already expressed the armature current i a of the motor in terms of voltage and resistances during explanation of back emf. Electric power is the rate per unit time at which electrical energy is transferred by an electric circuit the si unit of power is the watt one joule per second. We ve seen the formula for determining the power in an electric circuit.

Multiplying both sides of the above equation by i a we get where. In this calculator table you may enter two of the four factors in ohm s law. Power voltage current resistance p v i r calculator. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.

This calculator is based on simple ohm s law as we have already shared ohm s law p i v r calculator in which you can also calculate three phase current. They are power p or w measured in watts voltage v or e measured in volts current or amperage i measured in amps amperes and resistance r measured in ohms. In the international system of units the unit of power is the watt equal to one joule per second. The watts equation for an electrical circuit takes into account the voltage across the circuit v measured in volts and the current i measured in amps passing through it in mechanics the definition of power is the rate of doing work w it s defined as w t where t is the time it takes for the work to be completed.

Power is a scalar quantity. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. Voltage equation of dc motor.