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Study Guide (AP1)
1. Calculate the equivalent resistance between points A & B
2. Calculate current and voltage for each resistor. R1 = 10; R2 = 2; R3 = 5
3. A light bulb of unknown resistance is connected in series with a 9.0  resistor and a 12.0 V battery. The current
in the bulb is 0.80 A.
a. Sketch the schematic of the circuit.
b. Find the equivalent resistance of the circuit. (15)
c. Find the resistance of the light bulb. (6)
4. The following scenarios all have identical light bulbs and identical, ideal, batteries. First rank each in order of
largest to smallest equivalent resistance. Second, rank each in order of bulb brightness, brightest to dimmest.
a.
c.
b.
d.
5. Explain why birds can sit on power lines safely, even when the wires have no insulation around them, whereas
leaning a metal ladder up against a power line is extremely dangerous.
6. If all you have is a 120 V outlet, would it possible to light several 6 V lamps without burning them out? How?
7. A heavy bus bar is 20 cm long and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along
its length when it carries 4000 A? (the resistivity of copper is 1.69 x 10-8m) (0.0676 V)
8. A 1.5 cm square rod, 4.0 m long, measures 0.040 ohms. What is its resistivity? (2.25 x 10-6m)
9. Using the following circuit:
a. Calculate the total resistance of the following circuit. (8.11 )
b. Calculate the current flowing through the 4  resistor. (8.33A)
10. Three identical light bulbs are shown in a circuit.
a. Rank the light bulbs from brightest to dimmest.
b. Bulb B is now replaced with a short. What happens to the brightness of bulb A and the brightness of
bulb C?
11. A steady current of 2.4 A exists in a wire for 4.0 min.
a. How much total charged passes by a given point in the circuit during those 4.0 min? (580C)
b. How many electrons would this be? (3.6x1021 electrons)
12. Two point charges of -1.0 nC and +2.0 nC are separated by a distance of 0.30 m. What is the electric force on
each particle? (0.20 N)
13. At what separation would the force between a proton and an electron be 1 N? (1.52x10-14 m)
14. Compare and contrast charging by conduction and charging by induction. How are they the same? How are they
different?