Question

(1) find total resistance
(2) total current
(3) current in 20ohm and 25ohm resistor
(4) potential difference in 25ohm and 10ohm resistor​

Answer 1

Answer:

Explanation:

Total current in ammeter is 0.8 A

Current through 20 ohm resistor is 0.3 A, hence the voltage across it is

V=0.3×20=6V

Current through 15 ohm resistor is  

I=  

R

V

​  

=  

15

6

​  

=0.4A

Hence current through R1 is, I' = 0.8 - (0.3+0.4) = 0.1 A

Therefore,

R1=  

I  

′

 

V

​  

=  

0.1

6

​  

=60Ω