Formula For Power In Terms Of Voltage And Current

For any circuit element the power is equal to the voltage difference across the element multiplied by the current.

Formula for power in terms of voltage and current. Voltage is the difference in charge between two points. January 15 2018 basic formulas in electrical engineering voltage is defined as the difference in potential energy. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. 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.

If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage. Current is the rate at which charge is flowing. Voltage sources deliver power while resistors use power by dissipating it as heat. How much power does it use.

In the international system of units the unit of power is the watt equal to one joule per second. The movement of electrons. Basic formula to calculate voltage from energy and coulomb ee. Current flowing in the circuit i and resistance r.

The standard metric unit of power is the watt. How to use ohm s law to determine current. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. 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.

Current voltage resistance and power are the four basic properties of electrical circuits. Power is equal to the voltage across a circuit element multiplied by the current flowing through it the unit for power is the watt w which is equal to a joule per second this relation can be found from the formula for power. Power is measured in units of watts w where a watt is equal to a joule per second 1 w 1 j s. Learn the power formula.

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. We ve 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 let s apply this to a circuit example.

Power voltage current resistance p v i r calculator. In physics power is the amount of energy transferred or converted per unit time. By ohm s law v ir and so there are additional forms of the electric power formula for resistors. In older works power is sometimes called activity.

The power formula is used to compute the power resistance voltage or current in any electrical circuit. They all operate using the same basic power source. An electric machine makes use of 300 j of energy to do work in 10s.