The equation for voltage can be written as the current multiplied by the resistance. Voltage is defined as the electric potential energy at a given point in an electric field or circuit, according to About.com.

www.reference.com/article/equation-voltage-175ae7568265600e

To calculate watts to voltage, different formulas, such as Power = I x V and Power = V squared / R, are used. These different physics formulas are then manipulated so that voltage is expressed in terms of certain other v...

www.reference.com/article/calculate-watts-voltage-69ca4da29ffdefee

The formula for electrical impedance is Z = (sqrt)R^2 +Xl^2, where Z is impedance, R is resistance and Xl is the inductive reactance. Impedance is not the same thing as resistance. AC circuits, where impedance is measure...

www.reference.com/article/formula-impedance-9a008d01dd05afa5

The three formulas associated with Ohm’s law are the equations that demonstrate the relationships between voltage, current and resistance and follow from the formula for determining voltage by multiplying current by resi...

www.reference.com/article/three-formulas-associated-ohm-s-law-23a09ceb849c53c8

Neither a voltmeter nor an ammeter measures resistance directly; a voltmeter measures voltage and an ammeter measures amperage or current. However, using Ohm's law, resistance can be calculated from known quantities of v...

www.reference.com/article/voltmeters-ammeters-methods-measuring-resistance-1e5694b550073a81

Some of the basics of electrical engineering are current, voltage and resistance. These are three of the essential building blocks of electricity, and it is important to understand electricity at a fundamental level befo...

www.reference.com/article/basic-concepts-electrical-engineering-756d5e7357f160c7

Ohm's law is mainly used when building electrical devices to determine the amount of resistance needed to establish a certain current with a certain amount of voltage. Without Ohm's law, the circuit may have too much or ...

www.reference.com/article/need-use-ohm-s-law-ac7c2c0aef004a24