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PHYSICS
1. Calculate the amount of current flowing through a wire if 20 uC of charge flows past a point in the
wire during a time interval of 20 msce.
2. Calculate the resistance at 60° Cof a 100 meter length of copper wire having a diameter of 2 mm.
3. Calculate the electric conductivity of gold.
4. Calculate the current density in a 10mm diameter copper wire if an electric field of E 200 N/C is
applied along the length of the wire.
5. A voltmeter is attached to the terminals of an "unloaded" or standalone 9 V battery. The meter reads
9.4 V. What is the EMF of this battery? What is the terminal voltage of this battery? How much
current is flowing through the battery?
6.
In the previous problem, a 200 2 resistor is placed across the terminals of the 9 V battery. A
voltmeter reading across the battery terminals shows a voltage of 8.8 V. How much current is
flowing through the resistor? How much current is flowing through the battery?
7. In the previous problems, calculate the internal resistance of the battery
8.
In the previous problem, calculate the current flowing through the circuit if a second 100 o resistor is
placed in series with the first one.
9. In the previous problem, calculate the power dissipated through each one of the resistors attached to
the battery.
FOR PROBLEMS #10 #15, USE THE FOLLOWING RESISTANCE VALUES
R1 80 22
R2 30 22
R3 60 32
R4 30 92
R5 20 92
10. Calculate the equivalent resistance of R1, R2, and R4 all in series
11. In the previous problem, calculate the V2 and I2 assuming that Vab = 28 Volts across the entire circuit.
12. Calculate the equivalent resistance of R2, R3, and R4 all in parallel.
13. In the previous problem, calculate the V2 and I2 assuming that Vab 28 Volts across the entire circuit.
14. Given a circuit in which R1 is in series with R2 and Ra in parallel, which are in series with R4 and Rs
both in series, calculate V2, I2, V4, and I4 assuming that Vsb = 100 Volts across the entire circuit.
15. From the selection of resistors above, what arrangement of four (your choice) resistors will produce
the GREATEST equivalent resistance? The LEAST equivalent resistance? GIVE QUANTITATIVE
ANSWERS.
16. In the following circuit, E1 = 18 V, E2 28 V, " 252 T2 40, R1 = 200 and R2 = Calculate
the currents I1 through the first battery, I2 through the second battery, and I3 through the load resistor.
R,
W
r,
r2
R,
E1
E,
17. In the previous problems, calculate the power dissipated by the load resistor.
18. Repeat the Problem 16 above, but with battery V2 reversed.
19. Six 60W incandescent light bulbs are attached in parallel to a 120 V power source. A) What is the
equivalent resistance, Rea of the circuit? B) What is the resistance of each lightbulb filament? C)
Calculate the amount of current flowing through each bulb. D) Calculate the total current supplied by
the power source. E) What is the total power supplied by the source?
20. A 4 Kf resistor is in series with an initially uncharged 20 uF capacitor. Calculate a) the total charge
and b) the current, c) the voltage across the capacitor and d) the voltage across the resistor 50 msec
after these components are attached in series to a 10 Volt battery. Finally, c) calculate the time to
reach a 99% charge on the capacitor.

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