Question

3. A student has to use some value for resistance R2 in the given circuit. The current that she needs in
the entire circuit is exactly 9A.
А
12V
Rl=422
R2
B
Which is the correct option----a) 1 ohm
b) 2 ohm
c) 3 ohm
d) 4 ohm​

Answer 1

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

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Answer 2

Answer:

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