Power Formula Using Voltage

We ve seen the formula for determining the power in an electric circuit.

Power formula using voltage. Electric power is usually produced by electric generators but can also be supplied by sources such as electric batteries it is usually supplied to businesses and homes as domestic mains electricity by the electric power industry. 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. By ohm s law v ir and so there are additional forms of the electric power formula for resistors.

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. Work done w 300 j time taken t 10 s. Power is measured in units of watts w where a watt is equal to a joule per second 1 w 1 j s. The standard metric unit of power is the watt.

The power formula is used to compute the power resistance voltage or current in any electrical circuit. An electric machine makes use of 300 j of energy to do work in 10s. For any circuit element the power is equal to the voltage difference across the element multiplied by the current. 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.

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. 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. If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage. Power formula 1 electrical power equation.

Learn the power formula. Power within an electrical circuit is only present when both voltage and current are present. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω.