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Basic Physics Practice Test: DC Circuits
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Kirchhoff's junction rule: At any junction point, the sum of all the currents entering the junction must equal the sum of all the currents leaving the junction.
Kirchhoff's loop rule: The sum of the changes in potential around any closed path of a circuit must be zero.
 

Basic Physics Practice Test: DC Circuits
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25 Questions

1. A 22-A current flows into a parallel combination of a 4.0-W, 6.0-W, and 12-W resistor. What current flows through the 4.0-W resistor?
2. Three identical capacitors are connected in parallel to a battery. If a total charge of Q flows from the battery, how much charge does each capacitor carry?
3. An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across both the resistor and the ammeter. This network is then placed across a battery. If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained
4. If you connect two identical storage batteries together in series ('+' to '-' to '+' to '-'), and place them in a circuit, the combination will provide
5. A galvanometer with a coil resistance of 40.0 W deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V?
6. What is the maximum number of 100-W light bulbs you can connect in parallel in a 120-V circuit without tripping a 20-A circuit breaker?
7. 5.00 mF, 10.0 mF, and 50.0 mF capacitors are connected in series across a 12.0-V battery. How much charge is stored in the 5.00-mF capacitor?
8. The following three appliances are connected to a 120-V circuit: 1200-W toaster, 650-W coffee pot, and 600-W microwave. If all were operated at the same time what total current would they draw?
9. A galvanometer has an internal resistance of 100 W and deflects full-scale at 2.00 mA. What size resistor should be added to it to convert it to a milliammeter capable of reading up to 4.00 mA?
10. Consider three identical resistors, each of resistance R. The maximum power each can dissipate is P. Two of the resistors are connected in series, and a third is connected in parallel with these two. What is the maximum power this network can dissipate?
11. A voltage reading is obtained by placing a voltmeter across a resistor. What happens to the total current flowing in the circuit as a result of this action?
12. A combination of 2.0 W in series with 4.0 W is connected in parallel with 3.0 W. What is the equivalent resistance?
13. If you connect two identical storage batteries together in series ('+' to '-' to '-' to '+'), and place them in a circuit, the combination will provide
14. Three identical resistors are connected in parallel to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
15. When two or more capacitors are connected in series to a battery,
16. As more and more capacitors are connected in parallel, the equivalent capacitance of the combination increases.
17. A 14-A current flows into a series combination of a 3.0-W and a 4.0-W resistor. What is the voltage drop across the 3.0-W resistor?
18. A 4.0-MW resistor is connected in series with a 0.50-mF capacitor. The capacitor is initially uncharged. The RC combination is charged by a 9.0-V battery. What is the change in voltage between t = RC and t = 3RC?
19. A 2.0-mF capacitor is charged through a 50-kW resistor. How long does it take for the capacitor to reach 90% of full charge?
20. The lamps in a string of Christmas tree lights are connected in parallel. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)
21. Two 4.0-W resistors are connected in parallel, and this combination is connected in series with 3.0 W. What is the effective resistance of this combination?
22. Kirchhoff's loop rule is an example of
23. When resistors are connected in series,
24. Two capacitors of 6.00 mF and 8.00 mF are connected in parallel. The combination is then connected in series with a 12.0-V battery and a 14.0-mF capacitor. What is the equivalent capacitance?
25. As more and more capacitors are connected in series, the equivalent capacitance of the combination increases.

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