Power Ohm S Law

Just enter 2 known values and the calculator will solve for the others.

Power ohm s law. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. Calculate power current voltage or resistance. Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. In this section there are some examples of applying ohms law to find the three quantities of a circuit.

We ve seen the formula for determining the power in an electric circuit. 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 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.

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. It relates to the electrical quantities voltage current and resistance to each other. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. Ohms law and power the relationship between voltage current and resistance in any dc electrical circuit was firstly discovered by the german physicist georg ohm.

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. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. Ohm s law states that the voltage across a conductor is directly proportional to the current flowing through it provided all physical conditions and temperature remain constant. How to use ohm s law to determine current.

Power is typically produced by electric generators and supplied to businesses and homes through the electric power industry but can also be supplied by electric batteries or other sources. Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Georg ohm found that at a constant temperature the electrical current flowing through a fixed linear resistance is directly proportional to the voltage applied across it and also inversely proportional to the resistance. Ohm s law is a very simple tool for analyzing electrical circuits.

Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship. 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. V v i a r ω. This equation can be combined with ohm s law to solve for values that are unknown.

Ohm s law calculations with power in the four tables below you may enter two of the four factors in ohm s law.