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2. An electric current in a metal consists of moving .

3. As the temperature of a metallic conductor increases, its resistance usually .

4. If the diameter of a wire were to increase, its electrical resistance would .

5. If the potential difference across a 30.-ohm resistor is 10. volts, what is the current through the resistor? A

6. If the voltage across a 12-ohm resistor is 4.0 volts, the current throught the resistor is A.

7. Which quantity must be the same for each component in any series circuit?

8. Which quantity must be the same for each component in any parallel circuit?