Physics Worksheet Lesson 19 Electric Circuits - Eleanor Roosevelt High ...
Physics 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.
Electric Circuits
1. Electric components are commonly connected in one of the two ways:
5. Relation among all the currents:
_____________________________________________ 6. Relation among all the voltages:
_____________________________________________. 7. Find the equivalent resistance (Req):
____________________ ______________________ 2. Convert the following picture into schematic diagram.
3. Convert the following picture into schematic diagram.
Mr. Lin
_____________________________________________. 8. Write the Ohm's law using (a) individual resistance (R1
& R2), and (b) equivalent resistance (R/Req):
(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:
_____________________________________________. 13. Summary of series circuits:
I: __________________________________________.
V: __________________________________________.
R: __________________________________________.
P: __________________________________________. 1
Physics Worksheet Series Circuits Exercise
Electric Circuits
Section: Name:
23. If the voltage drop for the 10 resistor is 2 V,
calculate the total current I and the voltage V of the cell.
14. Three 3- resistors placed in series would provide a resistance which is equivalent to one _____- resistor.
10
40
2V
15. Three resistors with resistance values of 2-, 4-, and 6- are placed in series. These would provide a resistance, which is equivalent to one _____- resistor.
I V
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
10
40
circuit __________.
V1
V2
17. Three identical light bulbs are connected in series and
connected to a battery. Compare the brightness of them.
10V
18. A circuit has one resistor and the current is 4 A. If we add another identical resistor into the circuit in series, the current will become _________ A.
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.
20. Calculate the total resistance R and total current I.
300
200
I 4.5V
25. Calculate the Power P1, P2, and total power P of the
circuit.
10
40
P1
P2
10V
26. Calculate all the unknown quantities in the diagram.
200 V1
400 V2
I1
I2
I
3V
21. Calculate the equivalent resistance and voltage V of the
cell.
40
80
27. What will happen to the circuit if we add a wire to the circuit?
0.1A V
22. Calculate the resistance R.
300
R
0.002A 3V
28. What is the disadvantage of the series circuits?
Mr. Lin
2
Physics Worksheet Parallel Circuits
Electric Circuits
Section: Name:
Parallel Circuits Exercise
29. Label every component of the circuit; identify each of the voltage and current.
39. Three 3- resistors placed in parallel would provide a resistance which is equivalent to one _____- resistor.
40. Two resistors with resistance values of 20- and 40- are placed in parallel. These would provide a resistance, which is equivalent to one _____- resistor.
30. Relation among all the voltages:
_____________________________________________ 31. Relation among all the currents:
_____________________________________________. 32. Find the equivalent resistance (Req):
41. As more and more resistors are added in parallel to a 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.
_____________________________________________. 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? _____________________________________________. 35. Why is the overall resistance of the circuit decreased as the number of parallel branches increases? _____________________________________________. 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:
_____________________________________________. 38. Summary of parallel circuits:
I: __________________________________________.
V: __________________________________________.
R: __________________________________________.
P: __________________________________________.
Mr. Lin
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
20
I
3.0V
46. Calculate and compare I1 and I2.
10 I1
40 I2 I
10V
47. Calculate the equivalent resistance and voltage V of the
cell.
40
80 0.1A
V 3
Physics Worksheet
Electric Circuits
Section: Name:
48. Calculate the resistance R.
300
R
0.2A
3.0 V
49. If the current for the 10 resistor is 2 A, calculate the voltage V of the cell and the total current I. 10 2A
Compound Circuits 54. What is the equivalent resistance:
_____________________________________________.
_____________________________________________.
_____________________________________________.
55. Formulas for total/equivalent resistance:
R1
R2
R3
Rn
40 I
V
50. Calculate the Power P1, P2, and total power P of the
circuit.
10 P1
Series: _________________________.
_______________-
Rn
R3
R2
R1
40 P2 I
10V 51. Calculate all the unknown quantities in the diagram.
200 V1 I1
400 V2 I2 I
Parallel: _______________________________________.
56. Strategy to find the equivalent resistor of a compound circuit.
R1
R3
R2
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.
R1
R2
R3
53. What is the disadvantage of the parallel circuits?
Mr. Lin
4
Physics Worksheet
Electric Circuits
Section: Name:
58. Calculate the equivalent resistance of the following
compound circuit
2
3
2
63. Calculate the equivalent resistance R and the total
current I.
4
2
3
I
59. Calculate the equivalent resistance R and the total
current I
2
1
4
7V
60. Calculate the equivalent resistance R and the total
current I
10 20
15
4V
64. Calculate the the total current I, total voltage V and V2.
4
2 V2
3 4A
I
65. Calculate the R2, and I2 .
20 I2 R2
V
24 4 V 6V
30 12V
61. Calculate the the total current I and total voltage V.
0.1A 10 20 15
30
I
V
66. Calculate the I2 , R3, the total current I.
I1 3 R3
6
0.5 A I
12 V
67. Calculate the the total current I and total voltage V. 0.1A 20 40
15
20
I
V
62. If R1 = R2, calculate the R1, I2 , and the total current I.
R1 40
I2 R2 4 V
10 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, R2 = 30, R3 = 30, R4 =
15, V = 12V)
I2
R1, V1
R2, V2 I3
R4, V4
R3, V3 I
V
Mr. Lin
5
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