# Physics Worksheet Electric Circuits Section: Name: Series Circuits

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1 Do Now: (1) What is electric circuit? (2) Convert the following picture into schematic diagram. Series Circuits 4. Label every component of the circuit; identify each of the voltage and current. 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 (R eq ): 8. Write the Ohm s law using (a) individual resistance ( & ), and (b) equivalent resistance (R/R eq ): 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. 3. Convert the following picture into schematic diagram. 12. Find the total amount of power (P) in terms of individual power (P 1 & P 2 ) consumed by each resistor: 13. Summary of series circuits: :. :. R:. P:. Mr. Lin 1

2 23. f the voltage drop for the 10 Ω resistor is 2, Series Circuits Exercise calculate the total current and the voltage of the cell. 14. Three 3-Ω resistors placed in series would provide a resistance which is equivalent to one Ω- resistor. 15. Three resistors with resistance values of 2-Ω, 4-Ω, and 6-Ω are placed in series. These would provide a resistance, which is equivalent to one Ω- resistor As the number of resistors in a series circuit increases, the overall resistance and the current in the circuit. 24. Calculate and compare 1 and Three identical light bulbs are connected in series and connected to a battery. Compare the brightness of them A circuit has one resistor and the current is 4 A. f 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. f 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. 300Ω 200Ω 25. Calculate the Power P 1, P 2, and total power P of the P 1 P Calculate all the unknown quantities in the diagram. 200Ω 1 400Ω Calculate the equivalent resistance and voltage of the cell. 80Ω 27. What will happen to the circuit if we add a wire to the circuit? 0.1A 22. Calculate the resistance R. 300Ω R 28. What is the disadvantage of the series circuits? 0.002A 3 Mr. Lin 2

3 Parallel Circuits Parallel Circuits Exercise 29. Label every component of the circuit; identify each of the voltage and current. 39. Three 3-Ω resistors placed in parallel would provide a resistance which is equivalent to one Ω- resistor. 40. Two resistors with resistance values of 20-Ω and 40-Ω are placed in parallel. These would provide a resistance, which is equivalent to one Ω- resistor. 30. Relation among all the voltages: 31. Relation among all the currents: 32. Find the equivalent resistance (R eq ): 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 ( & ), and (b) equivalent resistance (R/R eq ): (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. f 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. f 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. 35. Why is the overall resistance of the circuit decreased as the number of parallel branches increases? 20Ω Total resistance any individual resistance. 37. Find the total amount of power (P) in terms of individual power (P 1 & P 2 ) consumed by each resistor: 46. Calculate and compare 1 and Summary of parallel circuits: :. :. R:. P: Calculate the equivalent resistance and voltage of the cell. 80Ω 0.1A Mr. Lin 3

4 48. Calculate the resistance R. 300Ω R 0.2A f the current for the 10 Ω resistor is 2 A, calculate the voltage of the cell and the total current. 2A Compound Circuits 54. What is the equivalent resistance: 55. Formulas for total/equivalent resistance: R n 50. Calculate the Power P 1, P 2, and total power P of the P 1 Series:. R n Calculate all the unknown quantities in the diagram. 200Ω P Parallel:. 56. Strategy to find the equivalent resistor of a compound 400Ω What will happen to the circuit if we cut a wire of the circuit? 57. Strategy to find the equivalent resistor of a compound 53. What is the disadvantage of the parallel circuits? Mr. Lin 4

5 58. Calculate the equivalent resistance of the following compound circuit 63. Calculate the equivalent resistance R and the total current. 4Ω 59. Calculate the equivalent resistance R and the total current 1Ω 4Ω Calculate the the total current, total voltage and 2. 4Ω 2 4A Calculate the, and 2. 20Ω 60. Calculate the equivalent resistance R and the total current 10 Ω 20 Ω Ω 4 30 Ω Calculate the 2,, the total current. 1 3 Ω 6 Ω 61. Calculate the the total current and total voltage. 0.1A 10 Ω 20 Ω 30 Ω 0.5 A Calculate the the total current and total voltage. 0.1A 20 Ω 40 Ω 20 Ω 62. f =, calculate the, 2, and the total current. 40 Ω 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. (where =, = 30Ω, = 30Ω, R 4 = 15Ω, = 12) , 1, 2 3 R 4, 4, 3 Mr. Lin 5

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