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ICSE Class 10 Physics 2016 Solved Paper

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A music system draws a current of 400‌mA when connected to a 12V battery.
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Question : 20
Total: 73
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 320‌mA . At what battery voltage does the music system stop playing?
Solution:  
Given: I=320‌mA=‌
320
1000
=0.32A ,
Resistance of music system =30Ω
According to Ohm's law, V = IR
=30×0.32=9.60‌ volts ‌
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