Question

When a 12 volt battery is connected across a unknown resistor there is a current of 2.5 m a in the circuit find the value of the resistance of the resistor

Answer 1

Answer:

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Answer 2

Given :-

• Potential difference (V) = 12 V

• Current (I) = 2.5 mA

• Current (I) = 2.5/1000 A

• Current (I) = 0.0025 A

To find :-

• Resistance (R) = ?

Solution :-

By using Ohm's law :-

we know that,

$\blue{\bigstar}{\underline{\boxed{\bf\pink{\dfrac{V}{I}=R}}}}$

$\rm\longrightarrow\:\dfrac{12}{0.0025}=R$

$\rm\longrightarrow\:R=4800\:\Omega$

or,

$\rm\longrightarrow\:R=4.8\:k{\Omega}$

More information :-

Ohm's law :- According to ohm's law,at any constant temperature,the current flowing through a conductor is directly proportional to the potential difference accross it's end.

$\rm\:I\propto{V}$

or,

$\rm\:V=R\times\:I$