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

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The amount of power changes when either voltage or current, or both voltage and current, are caused to change. In practice, the ONLY factors that can be changed are voltage and resistance . In explaining the different forms that formulas may take, current is sometimes presented as a quantity that is changed. The electrical relationships between resistance (R), current (I), power (P) and voltage (E) is defined by Ohm's Law. One ohm is defined as the resistance which allows the current of one ampere under a potential difference of 1 volt.