Physics Worksheet Lesson 19 Electric Circuits

嚜燕hysics Worksheet

Electric Circuits

Section:

Name:

Do Now:

Series Circuits

(1) What is electric circuit?

4. Label every component of the circuit; identify each of the

voltage and current.

________________________________________________

(2) Convert the following picture into schematic diagram.

5. Relation among all the currents:

_____________________________________________

6. Relation among all the voltages:

Electric Circuits

_____________________________________________.

1. Electric components are commonly connected in one of

the two ways:

7. Find the equivalent resistance (Req):

_____________________________________________.

8. Write the Ohm＊s law using (a) individual resistance (R1

& R2), and (b) equivalent resistance (R/Req):

____________________

______________________

2. Convert the following picture into schematic diagram.

(a) __________________________________________.

(b) __________________________________________.

9. What will happen to the resistance if the number of series

devices increases?

_____________________________________________.

10. Why is the overall resistance of the circuit increased as

the number of devices increases?

_____________________________________________.

11. Total resistance ________ any individual resistance.

12. Find the total amount of power (P) in terms of

individual power (P1 & P2) consumed by each resistor:

3. Convert the following picture into schematic diagram.

_____________________________________________.

13. Summary of series circuits:

I: __________________________________________.

V: __________________________________________.

R: __________________________________________.

P: __________________________________________.

Mr. Lin

1

Physics Worksheet

Electric Circuits

Section:

Name:

23. If the voltage drop for the 10 次 resistor is 2 V,

calculate the total current I and the voltage V of the cell.

Series Circuits Exercise

14. Three 3-次 resistors placed in series would provide a

10次

resistance which is equivalent to one _____次- resistor.

40次

2V

15. Three resistors with resistance values of 2-次, 4-次, and

I

6-次 are placed in series. These would provide a resistance,

V

which is equivalent to one _____次- resistor.

16. As the number of resistors in a series circuit increases,

24. Calculate and compare V1 and V2.

the overall resistance __________ and the current in the

circuit __________.

10次

40次

V1

V2

17. Three identical light bulbs are connected in series and

connected to a battery. Compare the brightness of them.

10V

25. Calculate the Power P1, P2, and total power P of the

circuit.

18. A circuit has one resistor and the current is 4 A. If we

add another identical resistor into the circuit in series, the

10次

40次

P1

P2

current will become _________ A.

10V

19. A circuit has one resistor and the current is 4 A. If we

add another 3 identical resistors into the circuit in series,

the current will become _________ A.

26. Calculate all the unknown quantities in the diagram.

20. Calculate the total resistance R and total current I.

300次

200次

200次

V1

400次 V2

I1

I2

I

I

3V

4.5V

21. Calculate the equivalent resistance and voltage V of the

cell.

40次

80次

27. What will happen to the circuit if we add a wire to the

circuit?

0.1A

V

22. Calculate the resistance R.

300次

R

28. What is the disadvantage of the series circuits?

0.002A

3V

Mr. Lin

2

Physics Worksheet

Parallel Circuits

Electric Circuits

Section:

Parallel Circuits Exercise

29. Label every component of the circuit; identify each of

the voltage and current.

Name:

39. Three 3-次 resistors placed in parallel would provide a

resistance which is equivalent to one _____次- resistor.

40. Two resistors with resistance values of 20-次 and 40-次

are placed in parallel. These would provide a resistance,

which is equivalent to one _____次- resistor.

41. As more and more resistors are added in parallel to a

30. Relation among all the voltages:

_____________________________________________

31. Relation among all the currents:

circuit,

the

equivalent

resistance

of

the

circuit

____________ and the total current of the circuit

____________.

42. Three identical light bulbs are connected in parallel and

_____________________________________________.

connected to a battery. Compare the brightness of them.

32. Find the equivalent resistance (Req):

_____________________________________________.

33. Write the Ohm＊s law using (a) individual resistance (R1

& R2), and (b) equivalent resistance (R/Req):

(a) __________________________________________.

(b) __________________________________________.

34. What will happen to the resistance if the number of

parallel devices increases?

43. A circuit has one resistor and the current is 2 A. If we

add another identical resistor into the circuit in parallel,

the total current will become _________ A.

44. A circuit has one resistor and the current is 2 A. If we

add another 3 identical resistors into the circuit in

parallel, the current will become _________ A.

45. Calculate the total resistance R and total current I.

10次

_____________________________________________.

20次

35. Why is the overall resistance of the circuit decreased as

the number of parallel branches increases?

I

_____________________________________________.

3.0V

36. Total resistance ________ any individual resistance.

37. Find the total amount of power (P) in terms of

individual power (P1 & P2) consumed by each resistor:

46. Calculate and compare I1 and I2.

I1

40次

I2

I

_____________________________________________.

38. Summary of parallel circuits:

I: __________________________________________.

10次

10V

47. Calculate the equivalent resistance and voltage V of the

cell.

40次

V: __________________________________________.

80次

R: __________________________________________.

P: __________________________________________.

Mr. Lin

0.1A

V

3

Physics Worksheet

Electric Circuits

48. Calculate the resistance R.

Section:

Name:

Compound Circuits

300次

54. What is the equivalent resistance:

R

_____________________________________________.

0.2A

_____________________________________________.

3.0 V

49. If the current for the 10 次 resistor is 2 A, calculate the

voltage V of the cell and the total current I.

10次

_____________________________________________.

55. Formulas for total/equivalent resistance:

2A

R1

R2

Rn

R3

40次

I

Series:

_________________________.

V

_______________-

50. Calculate the Power P1, P2, and total power P of the

circuit.

10次 P1

40次

Rn

R2

R1

P2

Parallel:

_______________________________________.

I

56. Strategy to find the equivalent resistor of a compound

circuit.

10V

51. Calculate all the unknown quantities in the diagram.

V1

I1

400次 V2

I2

200次

R3

R1

R3

R2

I

3V

52. What will happen to the circuit if we cut a wire of the

circuit?

57. Strategy to find the equivalent resistor of a compound

circuit.

R2

R1

R3

53. What is the disadvantage of the parallel circuits?

Mr. Lin

4

Physics Worksheet

Electric Circuits

58. Calculate the equivalent resistance of the following

2次

compound circuit

Section:

Name:

63. Calculate the equivalent resistance R and the total

current I.

2次

4次

3次

3次

2次

I

4V

64. Calculate the the total current I, total voltage V and V2.

59. Calculate the equivalent resistance R and the total

current I

2次

2次 V2

4次

4A

3次

1次

4次

I

7V

V

65. Calculate the R2, and I2 .

60. Calculate the equivalent resistance R and the total

current I

10 次 20 次

20次

24 次

I2

R2

4V

15 次

30 次

6V

66. Calculate the I2 , R3, the total current I.

12V

3次

I1

R3

6次

0.5 A

I

61. Calculate the the total current I and total voltage V.

0.1A 10 次

20 次

15 次

12 V

67. Calculate the the total current I and total voltage V.

0.1A 20 次

40 次

15 次

30 次

I

V

20 次

I

62. If R1 = R2, calculate the R1, I2 , and the total current I.

R1

40 次

I2

R2

4V

10 V

V

68. Use the diagram to calculate a) the total resistance in

the circuit, b) the total current through the circuit, c) the

total power the circuit consume, and d) the current

through R2. (where R1 = 10次, R2 = 30次, R3 = 30次, R4 =

15次, V = 12V)

I2

R2, V2

R1, V1

I3

R4, V4

R3, V3

I

V

Mr. Lin

5

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