Section 3 Review
**Bonus mark for completion – share it to your teacher**
1. Describe each of the kinds of energy:
a. Mechanical/Chemical
b. Electrical
c. Thermal
d. Light
e. Sound
f. Chemical
2. What is a thermocouple? What kind of energy conversion happens in a thermocouple?
3. Draw a picture of a basic motor, with labels.
4. What does each of the following do for a motor?
a. Commutator
b. Brushes
c. Magnets
d. Battery
e. Armature
5. How does a generator make electricity?
6. What is a transformer?
7. Describe the difference between step-up and step-down transformers.
8. Describe the meaning, and the difference, between AC and DC current.
9. What is efficiency, and how can you increase it?
10. What amount of current does a 200W toaster use in a 120V plug?
11. How much power is produced when a blow dryer is plugged into 120V and uses 6A of current?
12. Calculate the resistance of a 15 V lamp which uses 5 A of current.
13. A certain large wind turbine is able to transform 1,500,000 J of mechanical energy into
1,000,000J of electrical energy every second. Calculate the % efficiency.
14. If a 60 W light bulb is on for 3 hours (not seconds) and produces 360 000J of useful energy, what
is the efficiency of the light bulb?
15. Analyze the label below.