Question

(n W 2A 5 n or 3 R R 1 30V 692 In the above circuit. if the current reading in the ammeter A is 2A, what would be the value of R;?​

Answer 1

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The equivalent resistance for resistors 3 and 6 is R

36

= 3+63×6

=2Ω and voltage across it =IR

36

=2×2=4V.

Thus, voltage across R =6−4=2V and as the current 2 A passes through R so R=V/I=2/2=1 ohm.

Answer 2

Explanation:

Voltage, V=6V

Current, I=2A

Resistor 3 ohms and 6 ohms are in parallel. So,

1/r

= 1/3 + 1/6

r=2Ω

Now, 2 ohms and r are in series, so

R=2+r

Since,

R= V/I

2+r= 6/2

r=1Ω