What is the resistance of the music system? - ICSE Class 10 ...

ICSE Class 10 Physics 2016 Paper

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A music system draws a current of $400\,\mathrm{mA}$ when connected to a $12\,\mathrm{V}$ battery.

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Question : 19 of 73

Marks: +1, -0

What is the resistance of the music system?

Solution:

Given :

I=400 \text{mA}=\;\frac{400}{1000}=0.4 \text{A}

,

V=12 \text{V}

Resistance of the music system

=\;\frac{V}{I}

=\;\frac{12}{0 \cdot 4}=\;\frac{120}{4}=30 \Omega .

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