Voltage Current Resistance Power

Ohm s law and circuits with resistors.

Voltage current resistance power. Written by willy mcallister. Power power p is a measure of the rate at which energy is delivered or used by a circuit element. Google classroom facebook twitter. Introduction to circuits and ohm s law.

P power i or j latin. V voltage electric potential difference δ v or e electromotive force emf voltage. The current is equal to the electromotive force of the source divided by the total circuit resistance. 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.

V v i a r ω. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. This brings us back to georg ohm. Just like voltage resistance is a quantity relative between two points.

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. The circuit with the higher resistance will allow less charge to flow meaning the circuit with higher resistance has less current flowing through it. V i r and the power law equation formula. Power in a resistance is always positive regardless of voltage polarity and current direction.

We can extend the water analogy to understand resistance too. For this reason the quantities of voltage and resistance are often stated as being between or across two points in a circuit. If your power company charges you 10 cents per kilowatt hour then the power company will charge you 12 cents for every hour that you leave your space heater on. Power voltage current resistance p v i r calculator.

The nominal impedance z 4 8 and 16 ohms loudspeakers is often assumed as resistance r. 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. Influare international ampere or intensity and r resistance. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω.

It is the most fundamental law that defines the relationship between the current i resistance r voltage v and power p. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. Resistance which is measured in ohms. 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.

P i v. Now let s add one more factor to current and voltage. This is the currently selected item. Ohm s law equation formula.