Consider the three identical light bulbs shown in the circuit. Which one is true

Question

Consider the three identical light bulbs shown in the circuit. Which one is true All three bulbs are equally bright. Bulbs B and C are equally bright, but less bright than bulb A. Bulbs B and C are equally bright, but bulb A is less bright. Bulbs A and B are equally bright, but bulb C is less bright. Only bulb A is illuminated. A total resistance of 3.0 Ohm is to be produced by combining an unknown resistor R with a 12 Ohm resistor. What is the value of R and how is it to be connected to the resistor? 2.4 Ohm, parallel 2.4 Ohm, series 4.0 Ohm, parallel 4.0 Ohm, series 9.0 Ohm, series

Explanation / Answer

Q12.
P = IV = I^2*R

I in A is more than B and C

So, Option B.

Q13.
Req = 3 Ohm

Lets assume parallel combination, because Req is less than R2 which is 12 Ohm.
So,
Req = 1/ (1/R1+1/R2)
=> 3 = 1/(1/R1 + 1/12)
=> R1 = 4 Ohm.

So, Option C.

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