Power Current Voltage Equation

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 current voltage equation. If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage. To get the result in watts work must be expressed in joules and time must. Current flowing in the circuit i and resistance r. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω.

Learn the power formula. An electric machine makes use of 300 j of energy to do work in 10s. V v i a r ω. Power within an electrical circuit is only present when both voltage and current are present.

Electric power like mechanical power is the rate of doing work measured in watts and represented by the letter p the term wattage is used colloquially to mean electric power in watts the electric power in watts produced by an electric current i consisting of a charge of q coulombs every t seconds passing through an electric potential difference of v is. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. We ve seen the formula for determining the power in an electric circuit. 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.

The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. Power voltage current resistance p v i r calculator. Voltage sources deliver power while resistors use power by dissipating it as heat. 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.

How much power does it use. For example in an open circuit condition voltage is present but there is no current flow i 0 zero therefore v 0 is 0 so the power dissipated within the circuit must also be 0 likewise if we have a short circuit condition current flow is present but there is no voltage v 0 therefore 0 i 0. 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. Power is a scalar quantity.

How to use ohm s law to determine current. In physics power is the amount of energy transferred or converted per unit time. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. In the international system of units the unit of power is the watt equal to one joule per second.

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. In older works power is sometimes called activity. Power formula 1 electrical power equation.