Voltage Current Resistance Power

This brings us back to georg ohm.

Voltage current resistance power. 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. Power power p is a measure of the rate at which energy is delivered or used by a circuit element. 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. The power p in watts w is equal to the voltage v in volts v times the current i in amps a.

Power is measured in watts w. For this reason the quantities of voltage and resistance are often stated as being between or across two points in a circuit. It is the most fundamental law that defines the relationship between the current i resistance r voltage v and power p. The current is equal to the electromotive force of the source divided by the total circuit resistance.

Ohm s law equation formula. Just like voltage resistance is a quantity relative between two points. Decreasing the voltage decreases the current. Voltage sources deliver power while resistors use power by dissipating it as heat.

V voltage electric potential difference δ v or e electromotive force emf voltage. In equations power is usually given the letter p. Influare international ampere or intensity and r resistance. V v i a r ω.

We can extend the water analogy to understand resistance too. Power is the rate that electrical energy is transferred. V i r and the power law equation formula. 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.

P power i or j latin. Power in a resistance is always positive regardless of voltage polarity and current direction. Given any two of the values the other two can be calculated. 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.

But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. 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. Resistance which is measured in ohms. Power voltage current resistance p v i r calculator.

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. P i v. For a fixed resistance increasing the voltage will increase the current. The nominal impedance z 4 8 and 16 ohms loudspeakers is often assumed as resistance r.