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Learn how to calculate voltage, current, resistance and power in DC circuits using Ohms Law formulas and triangles. Find examples, power ratings, horsepower conversion and Ohms Law pie chart.
Learn how to use the power formula P = IE or P = I 2 R to determine the power dissipation in an electric circuit. See examples, applications, and the historical note on Joule's Law.
Learn how to calculate electric power using the formula P = VI, where V is the potential difference and I is the current. Find out the SI unit, relation with Ohm's law, and problems with solutions.
Learn how to calculate electric power in circuits using the formula P = IV, where P is power, I is current, and V is voltage. See how resistance, voltage, and current are related and how to apply Ohm's law and the formula wheel.
Definition: Electric Power. The electric power gained or lost by any device has the form \[P = IV.\] The power dissipated by a resistor has the form \[P = I^2 R = \dfrac{V^2}{R}.\]
An electric circuit is capable of transferring power. Current is the rate of flow of charge, and voltage measures the energy transferred per unit of charge. We can insert these definitions into the equation for power:
Learn how to calculate power in electric circuits using the formula P = IE, where P is power in watts, I is current in amps, and E is voltage in volts. Understand the difference between power and energy, and how to convert between horsepower and watts.
