Formula For Power With Voltage And Current

In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω.

Formula for power with voltage and current. Current flowing in the circuit i and resistance r. The standard metric unit of power is the watt. We ve seen the formula for determining the power in an electric circuit. The power formula is used to compute the power resistance voltage or current in any electrical circuit.

Learn the power formula. How much power does it use. These include the quantities current voltage and power. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.

One ohm is defined as the resistance which allows the current of one ampere under a potential difference of 1 volt. Electricity is the flow of electric charge we can describe the flow of electric charge in several ways. 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.

Current i is the rate of flow of charge carriers such as electrons current is usually thought of as moving in the direction of positive charge so from the positive power supply to the negative. Power is measured in units of watts w where a watt is equal to a joule per second 1 w 1 j s. By ohm s law v ir and so there are additional forms of the electric power formula for resistors. 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.

Current voltage and power. An electric machine makes use of 300 j of energy to do work in 10s.