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in Physics by (69.9k points)

A music system draws a current of 400m A when connected to a 12V battery. 

1. What is the resistance of the music system? 

2. The music system f left playing for several hours and finally the battery voltage drops and the music system stops playing when current drops to 320mA. At what voltage the music system stops playing?

1 Answer

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1. (i) Given : I = 400m A = 400 × 10-3

V=12V 

V=IR 

R = v/1 = 12v/400 × 10-3

R- 400× 10-3

R = 30Ω 

2. Current drops to I = 320m A = 320 × 10-3A The music stops playing at 

V = IR 

V = 320 × 10-3 × 30 

V = 9.6V

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