Formula For Power Using Voltage And Current

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.

Formula for power using voltage and current. Voltage is the difference in charge between two points. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. Power formula 1 electrical power equation. Learn the power formula.

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. Current is the rate at which charge is flowing. If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage. 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.

Power voltage current resistance p v i r calculator. They all operate using the same basic power source. The movement of electrons. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω.

One ohm is defined as the resistance which allows the current of one ampere under a potential difference of 1 volt. The electrical relationships between resistance r current i power p and voltage e is defined by ohm s law. Power within an electrical circuit is only present when both voltage and current are present. In this calculator table you may enter two of the four factors in ohm s law.

How to use ohm s law to determine current. We ve seen the formula for determining the power in an electric circuit.