Questions 1 The circuit shown has battery voltage Vo and three identical bulbs.

Question

Questions 1

The circuit shown has battery voltage Vo and three identical bulbs. With the switch open, lamps 1 and 2 are in series, and the ammeter reads current Io.

1 - What will voltmeter V1 and V2 read?

2 - Now you close the switch so that two lamps 2 and 3 are in parallel, and in series with the lamp 1. What will voltmeters V1 and V2 read now?

3 - What current will the ammeter read now?

4 - Write out equations for the power in each lamp before closing the switch in terms of Vo and Io. (P1=?, P2=?)

5 - Write out equations for the power in each lamp after closing the switch in terms of Vo and Io. (P1=?, P2=?, P3?)

6 - Calculate all the above for a 9.0-V battery and an initial current of 0.60 A.

Question 2

Circuit C has battery voltage Vo and four identical resistors R. Initially the switch is closed.

a) What is the current in each resistor?

b) What is the voltage across each resistor?

c) What power does the battery deliver to the circuit?

d) What is the current in each resistor when the switch is open?

e) What is the voltage across each resistor when the switch is open?

f) Calculate results for all of the above for a 12-V battery connected to four identical 1 ohms resistor.

The circuit shown has battery voltage Vo and three identical bulbs. With the switch open, lamps 1 and 2 are in series, and the ammeter reads current Io. What will voltmeter V1 and V2 read? Now you close the switch so that two lamps 2 and 3 are in parallel, and in series with the lamp 1. What will voltmeters V1 and V2 read now? What current will the ammeter read now? Write out equations for the power in each lamp before closing the switch in terms of Vo and Io. (P1=?, P2=?) Write out equations for the power in each lamp after closing the switch in terms of Vo and Io. (P1=?, P2=?, P3?) Calculate all the above for a 9.0-V battery and an initial current of 0.60 A.

Explanation / Answer

1)

a)v1 = V/2 and v2 = V/2

b)v1 = 2V/3 and v2 = V/3

c) i = 2V/3R

d) p1 = p2= I^2*R

e) p1= 4V^2/9R

p2 = V^2/9R

p3 = V^2/9R

f) put V=9 and I = 0.6 and easily get the results..

2)

a)I R1 =2V/5R

I R2 =I R3 = V/5R

I R4 = 2V/5R

b) V R1 =2V/5

V R2 =V R3 = V/5

V R4 = 2V/5

c) P = 2V^2/5R

d) I R1=I R2=I R3 = V/3R

e) V R1 =V R2 =V R3 =V/3

f) put V = 12V and R=1 and get the results...

best of luck..

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