Equation For Power Current And Voltage

This formula can be used to substitute for the voltage or for the current in the power formula and the power output of a battery that has internal resistance can be found using the formula v ε ir and the formula for power.

Equation for power current and voltage. A potential difference voltage across an electrical component is needed to make a current flow through it. Power voltage current resistance p v i r calculator. The power used or dissipated by a resistor can be found using the formula v ir. For any circuit element the power is equal to the voltage difference across the element multiplied by the current.

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

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. When describing voltage current and resistance a common analogy is a water tank. One ohm is defined as the resistance which allows the current of one ampere under a potential difference of 1 volt. Voltage is represented in equations and schematics by the letter v.

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

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.