v = Voltage applied across its ends

I = Current flowing through it.

If resistance are connected in series the series resistance is given by

If resistance are connected in parallel the parallel resistance is given by

Where, R_{1}, R_{2}, R_{3} ...... R_{n} are the given resistors. The resistance is measure in ohms ($\Omega$).

**Resistance Formula** is used to calculate the resistance across any given number of resistors in the circuit. It is also used to calculate the resistance in any given body.

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Below areproblems based on resistance which may be helpful for you.

Given: Current I = 2mA,

Potential difference V = 2 V

The resistance is given by R = $\frac{V}{I}$

= $\frac{2}{2 \times 10^{-3}}$

= 1000 $\Omega$.

Given: Resistance R

The parallel resistance is given by

$\frac{1}{R_{p}}$ = $\frac{1}{R_{1}}$ + $\frac{1}{R_{2}}$

Rp = $\frac{R_{1} R_{2}}{R_{1} + R_{2}}$

= $\frac{5 \times 2}{5 + 2}$

= 1.428 $\Omega$.

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