Ohm's law

What is the formula of ohm’s law and their units?

V= IR

V= potential difference(V)

R= Resistance (in Ω)

I= Electrical current intensity (in A)

What does ohm’s law state?

It states that for a given resistance, the potential difference in an electric circuit is directly proportional to the current intensity.

What happens when the current intensity in a circuit is doubled? And vice versa?

Potential difference will be doubled too.

If it is halved, potential difference will be halved too.

What happens if an element is replaced by another with higher resistance, but a constant potential difference is maintained?

the current intensity will drop/reduce.

Does ohm’s law apply to insulators?

No, it does not. it only applies to conductors, not insulators or semi-conductors.

Alternating Current (AC)

Electric current that repeatedly reverses direction, twice each cycle. Usually at 60 cycles per second, or hertz (Hz), in North America, or 50 Hertz elsewhere.

Ampere

The SI unit of electric current. A flow of one coulomb of charge per second is one ampere (symbol A).

Direct Current (DC)

Electric current whose flow of charge is always in one direction.

Electric Current

The flow of electric charge. Measured in amperes (C/s).

Electric Power

The rate at which electrical energy is converted into another form, such as light, heat, or mechanical energy (or converted from another form into electrical energy.)

Electric Resistance

The resistance of a material to the flow of electric current through it; measured in ohms (symbol Ω).

Ohm's Law

The statement that the current in a circuit is directly proportional to the voltage impressed across the circuit, and is inversely proportional to the resistance of the circuit.

Parallel Circuit

An electric circuit in which devices are connected to the same two points of the circuit, so that any single device completes the circuit independently of the others.

Series Circuit

An electric circuit in which devices are arranged so that charge flows through each in turn. If one part of the circuit should stip the current, it will stop throughout the circuit.

Circuit

Any complete path along which charge can flow.

Diode

An electronic device that restricts current to flow in a single direction in an electric circuit.

In Parallel

Term applied to portions of an electric circuit that are connect at two points and provide alternative paths for the current between those two points.

In Series

Term applied to portions of an electric circuit that are connected in a row so that the current that goes through one must go through all of them.

Ohm

The SI unit for electric resistance. One ohm (symbol Ω) is the resistance of a device that draws a current of one ampere when a voltage os one volt is impressed across it.

Potential Difference

The difference in electric potential (voltage) between two points. Free charge flows when there is a difference and will continue until both points reach a common potential.

Superconductivity

A property of a material that has infinite conductivity at very low temperatures, so that charge flows through it without resistance.

Voltage Source

A device, such as a battery or generator, that provides a potential difference.