Question

The music system draws a current of 400 mA when
connected to a 12 V battery.
(2016)
(a) What is the resistance of the music system?
(b) The music system if 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?
​

Answer 1

Answer:

i)Given:i=400mA=400/1000

=0.4A,v=12v

Resistance of music system =v/1

=12/0.4=120/4

=30

ii)Given:i=320mA=320/1000

=0.32A

Resistance of music system =30

According to the ohm's law,

v=ir

30×0.32

=9.60v

Therefore,the music system stops playing at 9.60v..

Explanation:

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