Resistance Power Equation

Power current and resistance.

Resistance power equation. Power potential difference current 230 2 0 460 w. Looking for more of a conceptual answer than a mathematical one. The standard metric unit of power is the watt. P v v r.

But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. The nominal impedance z 4 8 and 16 ohms loudspeakers is often assumed as resistance r. P power i or j latin. 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.

In this calculator table you may enter two of the four factors in ohm s law. Substitute v r for i in the power formula. Ohm s law equation formula. 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.

How can power be both inversely and directly proportional to resistance. V i r and the power law equation formula. Learn the power formula. Rearrange ohm s law in terms of i.

Work done w 300 j time taken t. 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. According to this equation power is inversely proportional to resistance on the left side and directly proportional to resistance on the right side. P i v.

An electric machine makes use of 300 j of energy to do work in 10s. Find resistance from power and voltage. How much power does it use. Electric power p is the measure of the electric current i with q coulombs of charge passing through a potential difference of v volts in time t seconds.

Power current 2 resistance. Influare international ampere or intensity and r resistance. The electrical relationships between resistance r current i power p and voltage e is defined by ohm s law. Electrical power can also be calculated using the equation.

Power and resistance formula. One ohm is defined as the resistance which allows the current of one ampere under a potential difference of 1 volt. We ve seen the formula for determining the power in an electric circuit. Remember to use the total voltage across the circuit or the voltage of the battery powering the circuit.

V voltage electric potential difference δ v or e electromotive force emf voltage. If you only know the power and voltage you can use a similar approach to find resistance. The power formula is used to compute the power resistance voltage or current in any electrical circuit. How to use ohm s law to determine current.

I v r.