Equation For Power In Terms Of Current And Voltage
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The standard metric unit of power is the watt.
Equation for power in terms of current and voltage. In physics power is the amount of energy transferred or converted per unit time. Current flowing in the circuit i and resistance r. In older works power is sometimes called activity. We ve seen the formula for determining the power in an electric circuit.
How to use ohm s law to determine current. Power is equal to the voltage across a circuit element multiplied by the current flowing through it the unit for power is the watt w which is equal to a joule per second this relation can be found from the formula for power. Power is a scalar quantity. Learn the power formula.
In the international system of units the unit of power is the watt equal to one joule per second. By ohm s law v ir and so there are additional forms of the electric power formula for resistors. How much power does it use. Power is measured in units of watts w where a watt is equal to a joule per second 1 w 1 j s.
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. 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. Voltage sources deliver power while resistors use power by dissipating it as heat.
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