Calculate Power From Voltage And Current

The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω.

Calculate power from voltage and current. The mathematical symbol for reactive. This page shows the online ac power calculator to calculate the ac current in a circuit for the given power factor angle voltage current etc. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. 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.

Learn the power formula. 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. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. Electric power calculator calculation general basic electrical formulas mathematical voltage electrical equation formula for power calculating energy work power watts calculator equation power law current charge resistance converter ohm s law and power law power formulae formulas understandimg general electrical pie chart two different equations to calculate power electricas ohms law audio.

This phantom power is called reactive power and it is measured in a unit called volt amps reactive var rather than watts. Power voltage current resistance p v i r calculator. Whereas in alternating current electric charge in alternating current changes direction periodically. The current i in amps a is equal to the power p in watts w divided by the voltage v in volts v.

For single phase connection voltage can be mathematically derived from this below formula for three phase connection voltage can be mathematically derived from this below formula. The current i in amps a is equal to the square root of the power p in watts w divided by the resistance r in ohms ω. We ve seen the formula for determining the power in an electric circuit. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.

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. V v i a r ω. Voltage calculator is also used in electrical engineering to measure the unknown voltage by two known quantities kva and current applied to the below formulas. In direct current the electric charge flows in only one direction.

In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. How to use ohm s law to determine current.