Can someone please help with these 3 questions? 1.) Predict how the current thro

Question

Can someone please help with these 3 questions?

1.) Predict how the current through bulb A will change, if at all, when

circuit 2.9 (a) is changed to 2.9 (b) (when bulb C is added in parallel to bulb B). What

will happen to the brightness of bulb A?

-The current through A will remain the same but switch direction

-The current through A will decrease     

-The current through A will increase

-The current through A will remain the same

-The current through A will be zero

-Impossible to tell without knowing the exact values of bulbs' resistances

2.) Predict how the current through bulb B will change, if at all, when circuit

2.9 (a) is changed to 2.9 (b) (when bulb C is added in parallel to bulb B). What will happen

to the brightness of bulb B?

-The current through B will increase

-The current through B will remain the same  

-Impossible to tell without knowing the exact values of bulbs' resistances

-The current through B will be zero

-The current through B will remain the same but switch direction

-The current through B will decrease

In the figure below, all bulbs and batteries are ideal and identical. Which of the following statement(s) is (are) correct? [Select all that are correct] A. Save B ) C

Explanation / Answer

1. A is in series with equivalent of B and C.

hence A is neither in series or parallel with B or C.

Correct

2. A and B are connected in series.

COrrect

3. A and B are in series so they will have same current.

hence same brightness.

Incorrect

4. B and C are in parallel.

so !/Reff = 1/R + 1/R

R_effective = R/2

Correct

5. B and C are connected in parallel.

Incorrect

6. for b, Req = R+ R/2 = 1.5 R

and for a, Req = R + R = 2 R

Incorrect

7. Correct (as explained in 6)

8. Incorrect (as explained in 1)

9. correct (as explained in 5)

10. incorrect (see 1)

11. Incorrect

12. Incoorect

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