Item 3 The three circuits below contain identical bulbs as well as ideal and ide

ID: 1559293 • Letter: I

Question

Item 3

The three circuits below contain identical bulbs as well as ideal and identical batteries.

Part A

How does the brightness of bulb A compare to the brightness of bulb B?

Part B

How does the brightness of bulb B compare to the brightness of bulb C?

Part C

How does the brightness of bulb D compare to the brightness of bulb E?

Part D

How does the brightness of bulb A compare to the brightness of bulb D?

Part E

How does the brightness of bulb C compare to the brightness of bulb E?

Bulb A is brighter than bulb B. Bulb A is as bright as bulb B. Bulb A is dimmer than bulb B. D COE

(resistance of each bulb is R and voltage across battery is V)
for circuit 1:

I_A = V / R

for circuit 2:

(current will be same as connected in series)

I_B = I_C = V / (R + R) = V / 2 R

for circuit 3:

(potential diff across both bulb will be same as battery connected in parallel)

I_D = V/R

I_E = V / R

(A) through A is more current hence

bulb A is brighter than bulb B.

(B) B and C have same current through them.

Bulb B is as bright as bulb C.

bulb D is as bright as bulb E.

(D) I_E > I_C

Bulb C is dimmer than bulb E.

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