1. Which of the following are reasons to use an insulator? I. To protect wires from touching each other and causing a short circuit. II. To allow the maximum current to flow in a circuit. III. To protect humans from electric shock.

a. I only

b. III only

c. I and III

d. I, II, and III

6. Which of the following characteristics are true about a series circuit? I. The current that goes through each resistor is the same. II. The drop in the voltage across each resistor is proportional to the resistance of that resistor. III. The current in the circuit is equal to the sum of the currents flowing in each part of the circuit.

a. II only

b. I and III

c. I only

d. I and II

8. A resistor is 20.0 ? and the current is 2.3 A. What is its voltage drop?

a. 106

b. 8.7

c. 46

d. 0.155

15. Dielectrics can help increase capacitance because:

a. None of these reasons are correct.

b. Dipolar molecules in the material align perpendicular to the existing electric field.

c. Dipolar molecules in the material align opposing the existing electric field.

d. Dipolar molecules in the material align with the existing electric field.

V = 12 V R 1 R2 R3 19. In the circuit shown, if R, = 1.0 0, R2 = 20 0, and Ry = 300 0, what is the current, I, flowing back to the battery? 6.3A 12.0 A 12.6 A 5.2A4. According to Kirchoff's First Law, what can be said, specifically, about the currents that meet at point A, and about the currents that meet at point B? A B R1 R2 R3 B i U Font Family10. If you are given a certain material to make a cylindrical resistor, how will the resistance change if you make the resistor longer? How will the resistance change if you increase the diameter of the cylinder? B i U Font Family 11. What is an insulator? Give a practical example of an insulator, and its purpose. B i U Font Family 12. Describe how a capacitor is constructed and the purpose of a capacitor