Find the potential difference required to flow a current of 200 mA in a wire of resistance 20 ohm.

$4 V$

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$3 V$

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$2 V$

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$1 V$

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Solution

The correct option is A
$4 V$

Given: Current $I = 200 m A = 200 \times 10^{- 3} A$

Resistance of wire $R = 20 Ω$ .

Let potential difference be $V$ .

According to Ohm's law, $V = I \times R = 200 \times 10^{- 3} \times 20 = 4 V$ .

So, the potential difference required to flow a current of 200 mA in a wire of resistance 20 ohm is $4 V$ .

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Find the potential difference required to flow a current of 200 mA in a wire of resistance 20 ohm.

The correct option is A 4 V Given: Current I=200 mA=200×10−3 A Resistance of wire R=20 Ω. Let potential difference be V. According to Ohm's law, V=I×R=200×10−3×20=4 V. So, the potential difference required to flow a current of 200 mA in a wire of resistance 20 ohm is 4 V.