# Power formula in terms of current and resistance

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In terms of a conceptual understanding, the amount of power that can be transferred across a "load" or a resistance is directly affected by the resistance. He found, by experiment, that pressure equaled the product of current and resistance; this relationship is referred to as Ohm’s law. This law is the practical basis on which most electrical calculations are determined. The formula may be expressed in various forms and by its use, as in the three examples shown in figure 1.

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He found, by experiment, that pressure equaled the product of current and resistance; this relationship is referred to as Ohm’s law. This law is the practical basis on which most electrical calculations are determined. The formula may be expressed in various forms and by its use, as in the three examples shown in figure 1. He found, by experiment, that pressure equaled the product of current and resistance; this relationship is referred to as Ohm’s law. This law is the practical basis on which most electrical calculations are determined. The formula may be expressed in various forms and by its use, as in the three examples shown in figure 1.

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Power Formula 1 – Electrical power equation: Power P = I × V = R × I 2 = V 2 ⁄ R where power P is in watts, voltage V is in volts and current I is in amperes (DC). If there is AC, look also at the power factor PF = cos φ and φ = power factor angle (phase angle) between voltage and amperage. The first, and perhaps most important, the relationship between current, voltage, and resistance is called Ohm’s Law, discovered by Georg Simon Ohm and published in his 1827 paper, The Galvanic Circuit Investigated Mathematically.

So, if R is the external resistance of the circuit and r is the internal resistance of the source of current (i.e. a battery) then the output power is maximum, when R = r. This theorem is applicable to all types of source of e.m.f. and is related with the output power and NOT with the power dissipated. This formula is derived from Ohm's law. Where we have: V: voltage I: current R: resistance If the electric power and the total resistance are known, then the current can be determined by using the following formula: I = √(P / R) Corresponding units: Ampere (A) = √(Watt (W) / Ohm (Ω)) Where P is the electric power. Electric Current

This formula is used for calculating power when voltage V and resistance R is known to us. It is clear from the above equation that power is inversely proportional to the the resistance. Thus the resistance of high power devices is smaller then the low power ones. Mar 22, 2017 · Relationship between Energy Transferred, Current, Voltage and Time The potential difference or voltage, V across two points is defined as the energy, E dissipated or transferred by a coulomb of charge, Q that moves through the two points. Therefore, potential difference, Current is the rate of charge flow. The RMS or effective value is a value for a voltage or current that an equally great power in a resistance dissipates as a DC voltage or current with the same value. An alternating voltage with an effective value of 230 V will develop a same amount of heat in a resistor as a pure DC voltage of 230 V.