Question

Calculate the resistance of a conductor if the current flowing through it is 0.2 amperes when the applied potential difference is 0.8 volt.

Answer 1

We are given that :

Given volt , V = 0.8 volt .

Current ,I = 0.2 A

We know very well that according to Ohm's law ,

Volt = Current × Resistance

V = I×R

Using it we can get R (Resistance) :

Resistance = Volt / Current

R = V/I

R = 0.8/0.2 = 4 ohm = 4 Ω

The required resistance = 4 Ω

Who gave Ohm's law ?

=> A German physicist named George Simon Ohm studied the relationship between electric current and potential across the ends of a conductor. He did it in 1826.

He gave a law which states that the electric currentflowing in a conductor is directly proportional to the potential difference across the ends of the conductor provided the temperature and other physical conditions of the conductor remain the same.

Mathematically we can say that :

V = IR

Answer 2

Answer:

Explanation:

Concept:

Ohm's law is one of the most fundamental and crucial laws in electric circuits. If all physical conditions and temperatures stay constant, Ohm's law asserts that the voltage across a conductor is directly proportional to the current flowing through it.

Given:

The value of $V$ is  $0.8 V$,

The value of $I$ is $0.2 A$.

Find:

Let find the value of resistance of a conductor.

Solution:

Lets apply ohms law to get the desired result.

We know that

$V = I R\\or\\R = \frac{V}{I}$

Substitute the values of V and I in the above formula

$R= 0.8 /0.2$

$R=4$Ω

The resistance of a conductor 4Ω.

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