1.

The number of electrons in aluminum and silver is 13 and 47, respectively. Draw each atom if aluminum has an atomic mass of 27, and silver has an atomic mass of 108. Explain why each is a good conductor.

2.

Determine the charge possessed by 19x10¹³ electrons. Determine the current if these electrons traveled 1mm in 2.3ms. (ANS: 30.4 mCoulombs, 13.2mA)

3.

An electrically neutral material (a cat) acquires a negative charge of 47mC. How many electrons were added to the cat? What current would pass through your body if the static charge was in contact with you for 16.7ms. (ANS: 2.93x10¹⁴ electrons, 2.81A)

4.

The charge passing through a wire is given by Q = 10t + 4, where Q is in coulombs and t is in seconds;
(a) How much charge has passed in 5s? (ANS: 54 Coulombs)
(b) How much charge has passed in 8s? (ANS: 84 Coulombs)
(c) What is the current flow in the above two parts? (ANS: 10.8A, 10.5A)

5.

A 10kW potentiometer has its wiper (terminal c) initially at the bottom terminal, b. Determine the resistance R_ac, between terminals a and c, and R_cb, between terminals c and b, if the wiper is:
(a) At terminal b; (ANS: 10kW, 0W)
(b) 1/5 the way around the resistive surface; (ANS: 8kW, 2kW)
(c) 3/5 the way around the resistive surface; (ANS: 4kW, 6kW)
(d) At terminal a. (ANS: 0W, 10kW)

6.

Determine the color codes for the following resistors:
(a) 33kW±5%
(b) 820W±10%
(c) 15W±20%
(d) 2.7MW±5%

7.

Determine the following resistors from the color code:
(a) Brown-Green-Yellow-Silver
(b) Red-Gray-Gold-Gold
(c) Yellow-Violet-Blue-Gold
(d) Orange-White-Black-Gold