Question

Define Electric potential, voltmeter, current and ohm's law.​

Answer 1

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★ ELECTRIC POTENTIAL:

• Electric potential at a point in an electric field is equal to amount of work done in: bringing a unit positive charge from infinity to that point.

★ VOLTMETER:

• A device which is used for measuring the potential difference across any two points of a conductor is called voltmeter.

★ ELECTRIC CURRENT:

• The rate of flow of charge through a conductor is called current.

★ OHM'S LAW:

• At any constant temperature, the current flowing through a conductor is directly proportional to the potential applied across it.

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Answer 2

Electric potential:

An electric potential (also called the electric field potential, potential drop or the electrostatic potential) is the amount of work needed to move a unit of charge from a reference point to a specific point inside the field without producing an acceleration. Typically, the reference point is the Earth or a point at infinity, although any point can be used.

Voltmeter:

A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter.

Current:

An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits this charge is often carried by electrons moving through a wire. 

Ohm's Law:

It is a law stating that electric current is proportional to voltage and inversely proportional to resistance.