Ohms Law For Power

Calculate power current voltage or resistance.

Ohms law for power. Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. They are power p or w measured in watts voltage v or e measured in volts current or amperage i measured in amps amperes and resistance r measured in ohms. How can we relate power with other three properties. This equation can be combined with ohm s law to solve for values that are unknown.

The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. Joule s first law answer it. 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. While voltage current and resistance are three basic electrical properties the fourth player is power.

We ve seen the formula for determining the power in an electric circuit. In ohms law we know that i e r so combined with the power equation p ie we get p e e r or p e 2 r. Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship. How to use ohm s law to determine current.

V v i a r ω. Ohm s law calculations with power in the four tables below you may enter two of the four factors in ohm s law. Ohms law pie. Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in.

Ohms law pie chart. Just enter 2 known values and the calculator will solve for the others. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. To help us understand the the relationship between the various values a little further we can take all of the ohm s law equations from above for finding voltage current resistance and of course power and condense them into a simple ohms law pie chart for use in ac and dc circuits and calculations as shown.

Learn the power formula. P is for power measured in watts i is for current and the e is for voltage. Simple to use ohm s law calculator. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω.

In resistive circuits joule s law can be combined with ohm s law to produce alternative expressions for the amount of power dissipated as shown below. Ohm s law and the power.