Resistance From Power And Voltage

V i r and the power law equation formula.

Resistance from power and voltage. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. How to calculate power. Ohm s law discovered in 1827 by georg simon ohm states that the current in a conductor is proportional to the voltage and inversely proportional to the resistance. So for this analogy remember.

This formula can be used to substitute for the voltage or for the current in the power formula and the power output of a battery that has internal resistance can be found using the formula v ε ir and the formula for power. V 150 v. If voltage and current are given then you can easily calculate the value of the power. Since power measured in watts is a.

Ohm s law equation formula. The nominal impedance z 4 8 and 16 ohms loudspeakers is often assumed as resistance r. V voltage electric potential difference δ v or e electromotive force emf voltage. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.

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. V 10 ma x 15 kω. P power i or j latin. Most electrical calculations involving resistance voltage current or power are solved using ohm s law.

P i v. Power voltage current resistance p v i r calculator. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. Voltage is represented in equations and schematics by the letter v.

The power used or dissipated by a resistor can be found using the formula v ir. Influare international ampere or intensity and r resistance. 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. For this reason the quantities of voltage and resistance are often stated as being between or across two points in a circuit.

When describing voltage current and resistance a common analogy is a water tank. 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 in a resistance is always positive regardless of voltage polarity and current direction. V v i a r ω.

Just like voltage resistance is a quantity relative between two points. Power p voltage v current i. In this calculator table you may enter two of the four factors in ohm s law. Voltage volts current amps x resistance ω.