1. What are the units for EPE, voltage, and current?

2. You often hear the expression "a wire with a current". What would you see in the wire if you could "see" a current with a wire?

3. When an electron moves through a wire, it collides with atoms in the wire.

What is the energy conversion/transformation during a collision? Give both the starting and ending energy?

What is the energy conversion/transformation between collisions? Give both the starting and ending energy.

4. A friend of yours asks you to explain how currents can start electrical fires. How would you answer in terms of energy conversion?

5. An electron is moving inside a wire. For this problem, remember that energy (the sum of the KE and EPE) is conserved. This means if you lose one type of energy you must gain another type of energy, and vice versa.

Case 1: The electron slows down.

(a) Does it gain or lose KE?

(b) Does it gain or lose EPE?

(c) What is the energy conversion/transformation?

Case 2: The electron gains EPE,

(d) Does it gain or lose KE?

(e) Is the electron speeding up or slowing down?

(f) What is the energy transformation?

Case 3: The electron collides with an atom.

(g) During the collision, what is the energy conversion?