Question

1.3 V
The music system draws a current of 400 mA whenconnected to a 12 V battery.
(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:

Given, I = 400mA, then I = 400/1000  =0.4A,and V = 12V

a) Resistance = V/I = 12/0.4  = 30Ω

b) Here, I = 320mA = 320/1000 = 0.32 A and resistance = 30Ω

Then by Ohm's Law

V = IR

30 X 0.32 = 9.60V