Voltage And Current Formula

Electric current is nothing but the rate of change of electric charge through a circuit.

Voltage and current 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. If there is a voltage v across a resistor r a current i flows through it. Voltage and current rms. V i r.

In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω. Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. We ve seen the formula for determining the power in an electric circuit.

Maximum average power transfer. Power voltage current resistance p v i r calculator. Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. When describing voltage current and resistance a common analogy is a water tank.

There are several types of power in ac circuit. According to ohm s law the electric current formula will be. The mathematical formulas of ohm s law. Learn the power formula.

So for this analogy remember. Power formula 1 electrical power equation. Electric current relates the electric charge and the time. If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage.

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. 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. How to use ohm s law to determine current. First version of the voltage formula.

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. Power factor and apparent power. Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Ohm s law can be rewritten in three ways for calculating current resistance and voltage.

This current is related to the voltage and resistance of a circuit. The effective value of a periodic current is the dc current that delivers the same average power to a resistor as the periodic current. Make sure to read what is ac circuit first.