Physics, asked by biswarupmitra1978, 1 month ago

Define electric current. Write one
mathematical ef expression for
current in terms of charge

Answers

Answered by Anonymous

Answer:

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.

The relationship between current and resistance in an electric circuit. Current is usually denoted by the symbol I. Ohm's law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm's law is I = V/R.

Answered by Ankitsinharaya

$꧁Aɴsᴡᴇʀ ꧂$

➪ What is the Electric Current?

✍︎ 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.

✍︎ Mathematically, this can be represented as:

I = Qt

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= VR

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.

Solved Examples on Electric Current Formula

Q.1: Calculate the electric current passing through the circuit in which the voltage and resistance be 25V and 5 ω respectively?

Solution:

V = 25 V

R = 5ω

Here, we have to apply ohm’s law formula.

The equation for the electric current using Ohm’s law is,

I= VR

Putting the known values, we get

I = 255

I= 5 A

Thus the value of electric current is 5 A.