Two identical light bulbs are connected to a battery. Will the light bulbs be br

Question

Two identical light bulbs are connected to a battery. Will the light bulbs be brighter if they are connected to the battery in series or in parallel?

D) There is not enough information to determine an answer

In the given circuit R1 = 6 ?, R2 = 8 ?, R3 = 2 ?, ?1 = 4 V, and ?2 = 14 V. What is the current through R3 if current through R1 is 2/3 A.

Please show work

A) in series B) in parallel C) The brightness will be the same in series and in parallel.

D) There is not enough information to determine an answer

In the given circuit R1 = 6 ?, R2 = 8 ?, R3 = 2 ?, ?1 = 4 V, and ?2 = 14 V. What is the current through R3 if current through R1 is 2/3 A.

Explanation / Answer

1.

In parallel ,because as there is no voltage drop across resistors

2.

Let I1 be the current from battery E1

I2 current from battery E2

Applying KVL in left loop

-E1+I1R1+(I1+I2)R2=0

-4+6I1+(I1+I2)*8=0

14I1+8I2=4

14*(2/3)+8I2=4

I2=-(2/3) A

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