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ICSE Class 10 Physics 2016 Paper

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A music system draws a current of 400 mA400\,\mathrm{mA} when connected to a 12 V12\,\mathrm{V} battery.
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Question : 20 of 73
Marks: +1, -0
The music system is left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320mA320 \text{mA} . At what battery voltage does the music system stop playing?
Solution:  
Given: I=320mA=3201000=0.32AI=320 \text{mA}=\frac{320}{1000}=0.32 \text{A} ,
Resistance of music system =30Ω=30 \Omega
According to Ohm's law, V = IR
=30×0.32=9.60   volts   =30 \times 0.32=9.60 \;\text{ volts }\;
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