Current Resistance Equation

The power p in watts w is equal to the voltage v in volts v times the current i in amps a.

Current resistance equation. The resistance of an electrical component can be found by measuring the electric current flowing through it and the potential difference across it. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. Ohm defines the unit of resistance of 1 ohm as the resistance between two points in a conductor where the application of 1 volt will push 1 ampere or 6 241 10 18 electrons. Joule s first law also known as the joule lenz law states that the power of heating generated by an electrical conductor is proportional to the product of its resistance and the square of the current.

If a current i should flow through a resistor r the voltage v can be calculated. This article discusses resistance along with the resistance formula and its derivation. An easier way to explain resistance is to consider an example of a person in a crowded market struggling to go from one shop to another. Ohm s principal discovery was that the amount of electric current through a metal conductor in a circuit is directly proportional to the voltage impressed across it for any given temperature.

If there is a voltage v across a resistor r a current i flows through it. Since the current is set by the values of the voltage and resistance the ohm s law formula can show that. Ohm expressed his discovery in the form of a simple equation describing how voltage current and resistance interrelate. Joule heating also known as resistive resistance or ohmic heating is the process by which the passage of an electric current through a conductor produces heat.

This brings us back to georg ohm. 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. The circuit with the higher resistance will allow less charge to flow meaning the circuit with higher resistance has less current flowing through it. The resistance r in ohms ω is equal to the voltage v in volts v divided by the current i in amps a.

The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. I can be calculated. If we increase the voltage the current will increase. Ohm s law can be rewritten in three ways for calculating current resistance and voltage.

In electronics and electromagnetism the electrical resistance of an object is a measure of its opposition to the flow of electric current the reciprocal quantity is electrical conductance and is the ease with which an electric current passes electrical resistance shares some conceptual parallels with the notion of mechanical friction the si unit of electrical resistance is the ohm ω. Power voltage current resistance p v i r calculator. V v i a r ω. If we increase the resistance the current will reduce.

V i r. Electric current refers to the flow of electrons.