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Unit 9 Quiz#2

Equations:

Part 1: Multiple Choice

1. A 100-W and a 60-W light bulb is used in two different lamps in your home. The difference between a 100-W light bulb and a 60-W light bulb is the

  1. voltage drop across the 100-W light bulb is greater than that of the 60-W light bulb.
  2. current flowing through the 60-W light bulb is greater than that of the 100-W light bulb.
  3. the resistance of the 60-W light bulb is greater than that of the 100-W light bulb.
  4. the energy delivered to the 60-W light bulb is greater than that of the 100-W light bulb.
  5. two of the above.

 

2. A 3-Volt battery, a resistor, and an ammeter are connected in series in a circuit. If the 3-Volt battery is replaced by a 6-Volt battery, then

  1. the resistance of the resistor will decrease by a factor of two.
  2. the resistance of the resistor will increase by a factor of two.
  3. the ammeter reading will decrease by a factor of two.
  4. the ammeter reading will increase by a factor of two.
  5. None of the above; both the current and the resistance will remain constant.

 

3. Where do the electrons which flow through the circuit to light your household lamps originate?

  1. The electrons originate at the power plant and travel to our homes through power lines.
  2. The electrons originate in the fuse box of the home.
  3. The electrons were present in the wires of the circuit before the switch was "flipped."
  4. The electrons originate in the switch; when flipped, they flow from the switch to the lamp.
  5. Nonsense ... electrons do not move through the wires; only positive charge flows.

 

4. The speed at which charge flows through electrical circuits is

  1. very small because moving charge is continually colliding with atoms.
  2. very large because the strength of the electric field exerts large forces upon moving charge.
  3. not possible to determine because lights turn on immediately after the switch is "flipped".
  4. sometimes very large and sometimes very small, depending upon the age of the battery.

 

5. Increasing the current in a resistor by a factor of five will increase the heat produced by the resistor by a factor of

  1. 1/5
  2. 1/25
  3. 5
  4. 25

 

6. The resistance in a conducting wire will ___________ as the diameter of that wire is increased.

  1. increase
  2. decrease
  3. remain the same

 

7. The resistance in a conducting wire will ____________ as the length of that wire is increased.

  1. increase
  2. decrease
  3. remain the same

 

8. Which one of the following factors would not allow for the transmission of electric energy over long distances with very little energy losses?

  1. The use of wires with low resistance.
  2. The use of high voltage power lines.
  3. The use of a high current.

 

9. The power loss of a resistor is equal to _____________.

  1. IR2
  2. I/V
  3. I2R
  4. I2 Rt

 

10. The work required to move 2 coulombs of charge through a potential difference of 5 volts is

  1. 10 joules
  2. 2 joules
  3. 25 joules
  4. 50 joules.

 

11. How many coulombs of charge move past point "x" in 10 seconds? (See diagram below)

  1. 0.50
  2. 5.0
  3. 12
  4. 48

12. Current is a measure of

  1. the force that moves a charge past a point.
  2. the resistance to the movement of charge past a point.
  3. the energy used to move a charge past a point.
  4. the amount of charge that moves in a certain time past a point.
  5. the speed that the charge moves past a point.

 

13. One volt is equivalent to

  1. 1 W-s
  2. 1 J/s
  3. 1 J/C
  4. 1 s/J.
  5. 1 C/J.

 

14. A current of 0.80 A flows for 1.0 min. The total electric charge passing a point in this time is

  1. 0.80 C.
  2. 1.3 C.
  3. 48 C.
  4. 75 C
  5. 2.9 x 103 C.

 

15. How much chemical energy will the battery convert to electrical energy in 10 seconds? See diagram at right.

  1. 24 joules
  2. 240 joules
  3. 360 joules
  4. 600 joules

16. A resistor is placed in a circuit with a power supply. A student wishes to measure the current throught the resistor and the voltage drop across the resistor. Which circuit in the diagram below shows the meter(s) connected correctly?

 

Use the circuit diagram at the right to answer the next two questions.

17. The electric current through the light bulb is

  1. 0.67 ampere
  2. 2.0 amperes
  3. 6.0 amperes
  4. 4.0 amperes

18. The resistance of the light bulb is

  1. 1.0 ohm
  2. 0.5 ohm
  3. 0.17 ohm
  4. 23.5 ohms

 

Use the circuit diagram below to answer the next three questions.

19. The potential difference between X and Y is

  1. 24 V
  2. 16 V
  3. 12 V
  4. 8.0 V
  5. 2.0 V

20. The equivalent resistance of the circuit is

  1. 24 ohm
  2. 6.0 ohm
  3. 2.0 ohm
  4. 1.3 ohm
  5. 0.75 ohm

 

21. The current at Y is

  1. 2.0 A.
  2. 2.7 A.
  3. 4.0 A.
  4. 6.0 A.
  5. 1.4 x 103 A.

 

22. Two 10 ohm resistors connected IN SERIES draw a larger current from a battery than a single 10 ohm resistor would draw.

  1. True
  2. False

 

23. As resistors are added in parallel to a circuit, the current in the circuit

  1. decreases
  2. increases
  3. remains the same.

 

24. A 12 ohm resistor is connected in parallel with a 6.0 ohm resistor. The equivalent resistance is

  1. 18 ohm
  2. 12 ohm
  3. 6.0 ohm
  4. 4.0 ohm
  5. 0.25 ohm

 

Use the diagram at the right to answer the next three questions.

25. The potential difference across the ends of resistor R2 is

  1. 0.67 volt
  2. 1.5 volts
  3. 6.0 volts
  4. 28 volts

 

26. Compared to the potential difference across R2, the potential difference across R1 is

  1. one-half as great.
  2. twice as great.
  3. the same.
  4. four times as great.

27. Compared to the rate of heat production in R2, the rate of heat production in R3 is

  1. less
  2. greater
  3. the same.

28. In the diagram at the right, ammeter A reads 5 amperes and ammeter B reads 2 amperes, as shown. The reading of ammeter C is

  1. 1.4 amp
  2. 5 amp.
  3. 3 amp
  4. 7 amp.

     

29. How much energy is consumed when a 60.0 W light bulb is left on for 3.00 h?

  1. 20.0 J
  2. 180 J
  3. 540 J
  4. 10.8 kJ
  5. 648 kJ

 

30. How long must a 100-watt light bulb be used in order to dissipate 1,000 joules of electrical energy?

  1. 10 sec
  2. 100 sec
  3. 1,000 sec
  4. 100,000 sec.

 

Part 2: Short Answer

31. Using conversion factors, convert the quantity 1 kiloWatt x hour to units of Joules. Show all your conversion factors in the space below.

32. The table below lists quantities discussed in the last two units. For each quantity, list the symbol used to represent that quantity and write the full name of the standard metric unit for that quantity.

 

 

Four resistors (A, B, C, and D) are placed in a circuit and connected to a 24-V power supply. Two of the resistors and connected in parallel and two of the resistors are connected in series. Ammeters are placed in the circuit to measure the current passing through each resistor. The measured currents and the known resistances of the four devices are shown below. Use this information to answer the next three questions.

33. Which two resistors are placed in series? ___________ in parallel? ___________

 

34. Construct a circuit diagram of this circuit. Use the appropriate circuit symbols. Label each resistor as A, B, C, and D. Be sure to show the placement of the ammeters in the circuit. Indicate the voltage of the power supply.

 

35. Fill in the remaining column of the data table above, showing the voltage drop across each resistor.

 

 

 

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Last updated on 9/29/98.