Question

1. Suppose you have a 12-V battery, two light bulbs, and some wires that you can use to connect them.

(a) Draw a diagram showing the battery wired to the two light bulbs in the series configuration. Wires can be shown by lines, battery by a rectangle, and light bulb by some simple shape. (5 pts)

(b) Draw a diagram showing the battery wired to the two light bulbs in the parallel configuration. (5 pts)

2. The headlight in a car is connected to a 12 V battery. The light bulb uses 55 W of power.

a. What is the current flowing out of the positive terminal of the battery? (4 pts)

b. What is the current flowing into the negative terminal of the battery? (1 pt) 

3. A battery has a sticker on it that says “This 12V battery contains 50 Amp-hours.” This indicates the (Amps × hours) that the battery can provide, also written as “Ah.” How long can this battery provide 5 amps of current? (5 pts)

4. Find the resistance in ohms of a light bulb that produces 60 W of power when connected to 120 V household voltage. (5 pts)

5. Find the force between acting between two charged spheres separated by a distance of 10 m. One sphere has a charge of +1.0 × 10−3 coulombs, and the second sphere has a charge of −2.0 × 10−6 coulombs. Indicate if the force is attractive, or repulsive. (5 pts)

6. Indicate if the statements below are true or false: (5 pts)

(a) For AC, the voltage is constant

(b) For DC, the voltage is constant

(c) The time dependence of AC voltage follows a “sin” wave with frequency 60 Hz

(d) When several light bulbs are wired in a series combination, if one bulb burns out then the other lights stay on.

(e) When several light bulbs are wired in a parallel combination, if one bulb burns out then the other lights stay on.

Answer 1

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