ICSE Class 10 Physics 2016 Solved Paper

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

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

320 {\mA}

. At what battery voltage does the music system stop playing?

Solution:

Given:

{\I}=320 {\mA}=\;{320}/{1000}=0.32 {\A}

,
Resistance of music system

=30 Ω

According to Ohm's law, V = IR

=30 × 0.32=9.60 \;\text " volts "\;

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