ICSE Class 10 Physics 2016 Solved Paper

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

Question : 19 of 73

Marks: +1, -0

What is the resistance of the music system?

Solution:

Given :

I=400 {\mA}=\;{400}/{1000}=0.4 {\A}

{\V}=12 {\V}

Resistance of the music system

=\;{ {\V}}/{ {\I}}

=\;{12}/{0 ⋅ 4}=\;{120}/{4}=30 Ω .

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