Power Voltage Current Equation

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

Power voltage current equation. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. The watts equation for an electrical circuit takes into account the voltage across the circuit v measured in volts and the current i measured in amps passing through it in mechanics the definition of power is the rate of doing work w it s defined as w t where t is the time it takes for the work to be completed. 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. The standard metric unit of power is the watt.

Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. In this analogy charge is represented by the water amount voltage is represented by the water pressure and current is represented by the water flow. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage.

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. When describing voltage current and resistance a common analogy is a water tank. Current flowing in the circuit i and resistance r. To get the result in watts work must be expressed in joules and time must.

How to use ohm s law to determine current. 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. So for this analogy remember.

Power formula 1 electrical power equation. 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. Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship. 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. Learn the power formula.

How much power does it use. For example in an open circuit condition voltage is present but there is no current flow i 0 zero therefore v 0 is 0 so the power dissipated within the circuit must also be 0 likewise if we have a short circuit condition current flow is present but there is no voltage v 0 therefore 0 i 0. Power within an electrical circuit is only present when both voltage and current are present.