Unit 9 Quiz#1
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.
2. The role of the power supply in an electric circuit is to
5. The power delivered to the light bulb is.
6. The amount of work done by the battery to move 3.0 Coulombs of charge from terminal B to terminal A is
7. A 60 Watt light bulb is connected to a 120 volt plug. What is the current in the light bulb?
8. The current flow in a conducting wire will _________ as the length of that wire is increased.
9. Which one of the following does not represent units of current?
10. A kilowatt x hour is a unit of
11. A device used to measure current is known as the ___________.
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.
14. Charge encounters resistance as it flows through circuits because of
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
16. The voltage of the power supply is
17. Conventional current will flow through the external circuit from
18. The electric potential at A is ____________ the electrical potential at C.
19. The electric potential at C is ____________ the electrical potential at D.
20. The amount of energy lost by 1 Coulomb of charge as it flows through the external circuit is
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
22. The device which fails to obey Ohm's law seems to be
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
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
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?
© Tom Henderson, 1996-1998
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