Question

write the definition and and formula of electric current​

Answer 1

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Electric current is the rate of change of electric charge through a circuit.

Formula of electric current= charge÷time

Answer 2

Explanation:

definition :

The conducting material consists of a large number of free electrons which is moving from one atom to the other at random. When the potential difference is applied across a wire, then loosely attached free electrons will start moving towards the positive terminal of the cell.

This continuous flow of electrons makes the existence of the electrical current. Therefore the flow of currents in the wire is from the negative terminal to the positive terminal through the external circuit.

This traditional flow of current is so firmly established that it is still in use. Thus, the conventional direction of the flow of the electric current is from the positive terminal of the cell to the negative terminal of the cell through the external circuit.

formula :

The Formula for Electric Current

The magnitude of the flow of current at any section of the conductor is defined as the rate of flow of electrons.

Mathematically, this can be represented as:

I =

Q

t

Where,

I Electric current

Q Electric Charge

T Time

Electric current is the rate of change of electric charge through a circuit. This electric current is related to the voltage and resistance of the circuit. Using Ohm’s law, we can represent as the formula:

I=

V

R

Where,

V Electric Voltage

R The resistance of the metallic wire

I Electric Current

Since we measure the charge in coulombs and time in seconds, therefore the unit of electric current is coulomb/Sec or amperes. The amperes is the SI unit of the electric current. The symbol for electric current is I. Thus, an electric wire is said to carry a current of 1 ampere when charge flows through it with the rate of one coulomb per second.