Current Voltage Formula

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.

Current voltage formula. V i r. Voltage is represented in equations and schematics by the letter v. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. In this analogy charge is represented by the water amount voltage is represented by the water pressure and current is represented by the water flow.

Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship. This formula is derived from ohm s law. Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Capacitor voltage current capacitance formula.

Ohm s law can be rewritten in three ways for calculating current resistance and voltage. If there is a voltage v across a resistor r a current i flows through it. I p r corresponding units. Ampere a watt w ohm ω where p is the electric power.

So for this analogy remember. 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. The mathematical formulas of ohm s law. Resistance if the electric power and the total resistance are known then the current can be determined by using the following formula.

Find the current of an electrical circuit that has resistance of 50 ohms and voltage supply of 5 volts. We ve seen the formula for determining the power in an electric circuit. When describing voltage current and resistance a common analogy is a water tank. Capacitors are used extensively in electronics communications computers and power systems.

A capacitor is a passive element designed to store energy in its electric field. If we increase the voltage the current will increase. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. Learn the power formula.

If a current i should flow through a resistor r the voltage v can be calculated. Besides resistors capacitors are the most common electrical components. Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. Since the current is set by the values of the voltage and resistance the ohm s law formula can show that.

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. If we increase the resistance the current will reduce. If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage. First version of the voltage formula.