Power Current Resistance Voltage

Power power p is a measure of the rate at which energy is delivered or used by a circuit element.

Power current resistance voltage. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. Power voltage current resistance p v i r calculator. Just like voltage resistance is a quantity relative between two points. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.

Learn the power formula. 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. For very low values of resistance for example milli ohms mω it is sometimes much easier to use the reciprocal of resistance 1 r rather than resistance r itself. Influare international ampere or intensity and r resistance.

P i v. V i r and the power law equation formula. V v i a r ω. Ohm defines the unit of resistance of 1 ohm as the resistance between two points in a conductor where the application of 1 volt will push 1 ampere or 6 241 10 18 electrons.

For this reason the quantities of voltage and resistance are often stated as being between or across two points in a circuit. Voltage sources deliver power while resistors use power by dissipating it as heat. Ohm s law equation formula. The circuit with the higher resistance will allow less charge to flow meaning the circuit with higher resistance has less current flowing through it.

In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. P power i or j latin. The amount of current in a circuit depends on the amount of voltage and the amount of resistance in the circuit to oppose current flow.

The current is equal to the electromotive force of the source divided by the total circuit resistance. We ve seen the formula for determining the power in an electric circuit. V voltage electric potential difference δ v or e electromotive force emf voltage. Power within an electrical circuit is only present when both voltage and current are present.

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 is the most fundamental law that defines the relationship between the current i resistance r voltage v and power p. More specifically ohm s law defined that the current i through a conductor between two points is directly proportional to the voltage v and is inversely proportional to the resistance r. For example in an open circuit condition voltage is present but there is no current flow i 0 zero therefore v 0 is 0 so the power dissipated within the circuit must also be 0 likewise if we have a short circuit condition current flow is present but there is no voltage v 0 therefore 0 i 0.

How to use ohm s law to determine current.