1. Do opposite charges (+ and -) attract or repel each other?

2. Is voltage impressed across a circuit or does it flow through a circuit?

3. Is electric charge impressed across a circuit or does it flow through a circuit?

4. How is Coulomb's law similar to Newton's law of universal gravitation?

5. How is Coulomb's law different than Newton's law of universal gravitation?

6. If a circuit has steady resistance, what is the effect on current when the voltage doubles?

7. What is the effect on current if both the voltage and resistance are doubled?

8. For a circuit that has two light bulbs connected in series configuration, if the current through one light bulb is 10A, what is the current through the other light bulb?

9. If a mobile phone is connected to a 120V outlet and has an internal resistance of 15 Ohms, what is the current that is drawn by the mobile phone?

10. The three pairs of same-size metal spheres (A, B, C below) have different charges on their surfaces, as indicated. The members of each pair are brought together, allowed to touch, and then separated. Rank, from greatest to least, the total combined amount of charge on each pair of spheres after separation.