Download Audio 217 System Set Up and Maintenance

A217
Assignment 2 – Electronics I
Name:
Date:
1. What is meant by direct current as opposed to alternating current? Give an example of
each.
2. Give the 3 forms of Ohm’s law relating E, I and R.
3. Why does higher applied voltage with the same resistance result in more current? Draw a
graph showing the proportional relationship between E and I. (you do not have to put
numerical values on the graph, just label the axes)
4. Why does more resistance with the same applied voltage result in less current? Draw a
graph showing the inverse relationship between R and I. (you do not have to put
numerical values on the graph, just label the axes)
5. Whith 10 V across 5 ohms resistance, the current I is ______________
6. When 10 V produces 2.5 A, R is ______________
7. The resistance of 500,000 ohms is _________M ohms
8. With 10 V across 5000 ohms the current I is __________ mA
9. A vacuum tube has .3 A of current with 6.3 V applied. Draw the schematic showing the
tube as a resistance. How much is the resistance of the tube?
10. How much current is needed for a 600 W, 120-V amplifier?
11. How much is the resistance of a 600 W, 120-V amplifier?
12. How much current is needed for a 24-ohm resistor that dissipates 600 W?