Power Voltage Current Formula

Learn the power formula.

Power voltage current formula. If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. 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. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.

Power is measured in units of watts w where a watt is equal to a joule per second 1 w 1 j s. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. Power voltage current resistance p v i r calculator. 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.

For any circuit element the power is equal to the voltage difference across the element multiplied by the current. How to use ohm s law to determine current. By ohm s law v ir and so there are additional forms of the electric power formula for resistors. V v i a r ω.

We ve seen the formula for determining the power in an electric circuit. Power formula 1 electrical power equation. 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. The electrical relationships between resistance r current i power p and voltage e is defined by ohm s law.