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Unit 9 Quiz#1

Equations:

 

Part 1: Multiple Choice

You may write on this quiz. However, place the answers to the following questions on the ScanTron sheet.

1. Electrons are able to move in an electrical circuit because.

  1. they are continually colliding with other electrons
  2. they are continually colliding with atoms of the conducting wires
  3. an electric potential difference is established across the ends of the circuit
  4. the wires which make up the circuit are so thin
  5. none of the above

 

2. The role of the power supply in an electric circuit is to

  1. maintain an electric potential difference between the two ends of the circuit.
  2. act as a charge pump in order to pump charge from the - terminal to the + terminal.
  3. do work upon the charge in order to move it from a location of low potential to high potential.
  4. all of the above
  5. none of the above

The circuit at the right shows a lamp bulb connected to a 12-Volt battery. An experimenter measures 3.0 Coulombs of charge flowing out of the battery at location A every 2.0 seconds. Use this information to answer the next four questions.

3. The current in this circuit is

  1. 1.5 amps
  2. 3.0 amps
  3. 6.0 amps
  4. 18.0 amps
  5. 72.0 amps

4. The amount of charge which flows into the battery at location B is

  1. 1.5 C every 2 sec
  2. 3.0 C every 1 sec
  3. 3.0 C every 2 sec
  4. 4.0 C every 2 sec
  5. Not enough information to tell

 

5. The power delivered to the light bulb is.

  1. 2.0 Watts
  2. 8.0 Watts
  3. 12.0 Watts
  4. 18.0 Watts
  5. 36.0 Watts

 

6. The amount of work done by the battery to move 3.0 Coulombs of charge from terminal B to terminal A is

  1. 4.0 Joules
  2. 8.0 Joules
  3. 12.0 Joules
  4. 18.0 Joules
  5. 36.0 Joules

 

7. A 60 Watt light bulb is connected to a 120 volt plug. What is the current in the light bulb?

  1. 0.25 A
  2. 0.5 A
  3. 2 A
  4. 4 A
  5. more than 4 A

8. The current flow in a conducting wire will _________ as the length of that wire is increased.

  1. increase
  2. decrease
  3. remain the same

 

9. Which one of the following does not represent units of current?

  1. amperes
  2. volt/ohm
  3. C/sec
  4. J/C

 

10. A kilowatt x hour is a unit of

  1. potential
  2. force
  3. current
  4. energy
  5. power

 

11. A device used to measure current is known as the ___________.

  1. voltmeter
  2. ammeter
  3. watthour meter
  4. potentiometer

 

12. Which one of the following symbols represents the schematic circuit symbol of a resistor?

 

13. A circuit consists of a 6-Volt battery and a lamp bulb. The battery does 12 J of work in order to move 2 C of charge through the internal circuit. As the 2 C charge flows through the external circuit, it does _______ of work upon the light bulb.

  1. 1 J
  2. 2 J
  3. 6 J
  4. 12 J
  5. 24 J

 

14. Charge encounters resistance as it flows through circuits because of

  1. collisions with atoms in the conducting elements.
  2. the presence of insulators within the conducting elements.
  3. the rate at which a battery does work is less than the rate at which charge is able to flow.
  4. the inability of humans to produce the extreme voltages required for reducing resistance.

 

A power supply, light bulb, and two ammeters are connected in a circuit as shown below. Use the information in the diagram to answer the following questions.

15. The ammeter at the "bottom" of the diagram will read

  1. more than 0.5 amps
  2. 0.5 amps
  3. less than 0.5 amps
  4. not enough information to tell

 

16. The voltage of the power supply is

  1. 0.5 Volts
  2. 3 Volts
  3. 6 Volts
  4. 12 Volts

 

17. Conventional current will flow through the external circuit from

  1. B to D to C to A
  2. A to C to D to B
  3. A to B
  4. B to A

 

18. The electric potential at A is ____________ the electrical potential at C.

  1. less than
  2. greater than
  3. approximately equal to

 

19. The electric potential at C is ____________ the electrical potential at D.

  1. less than
  2. greater than
  3. approximately equal to

 

20. The amount of energy lost by 1 Coulomb of charge as it flows through the external circuit is

  1. 0.5 Joules
  2. 3 Joules
  3. 6 Joules
  4. 12 Joules

Anna Litical performed an experiment to measure the resistance of three different electrical devices (A, B, and C). Anna set up a circuit and collected voltage-current data for each of the three devices. Anna then constructed graphs of Voltage vs. Current for her data. Her data sets are shown below. Use the data in the tables to answer the next several questions.

 

21. An analysis of Anna's data would indicate that the device with the greatest resistance is

  1. Device A
  2. Device B
  3. Device C
  4. Not enough info to tell

 

22. The device which fails to obey Ohm's law seems to be

  1. Device A
  2. Device B
  3. Device C
  4. Not enough info to tell

 

23. An analysis of the data set for Device C show that one of the pairs of measured data (0.25 V, 0.79 amps) seems to be inconsistent with the other measurements. The best way for Anna to treat this particular data pair is

  1. to change the current measurement to a more consistent value, such as 0.50 amps.
  2. to conclude that the device acts inconsistent at a voltage of 0.25 V.
  3. to repeat the measurement of voltage for a current of 0.79 amps (assuming time permits).
  4. to repeat the measurement of current at the voltage of 0.25 V (assuming time permits).

 

24. An analysis of the data set for Device A shows that the ratio of V/I for each data pair is not exactly constant. The appropriate response to this fact would be to

  1. change certain measured values until the ratio of V/I is constant.
  2. conclude that the V/I ratio should not be constant.
  3. discard the data and repeat the experiment until the ratio of V/I is constant.
  4. blame the lack of a constant V/I ratio upon faulty equipment.
  5. construct a graph with a "regression line", thus averaging errors of mismeasurements

 

25. A voltage vs. current graph of the data for Device A would look like the graph at the right. If the axes were reversed and a graph of current vs. voltage was constructed instead, then the graph would look like.

 

 

 

Part 2: Problem-Solving

For the following problems, show all your work (with units) to receive full or partial credit. The solution to each problem will demand a careful treatment of units, thoughtful reasoning, and the appropriate usage of more than one equation.

 

26. An electric heater provides 2.00 kW of power when connected to a 120-V potential difference. How much energy is used if the heater is on for five hours?

 

27. Eighty percent of the electrical energy used by a sun lamp is converted into thermal energy. When the sun lamp is plugged into a 120-V outlet, it draws 2.00 A. How much thermal energy (heat) is released by this lamp in 30.0 minutes?

 

 

 

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Glenbrook South High School.

Last updated on 9/29/98.