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Homework exercises on Direct Current Electricity for a Physical Science course. Also refer to physics, static electricity, AC, DC, magnetism, Edison, courseware, Ron Kurtus, School for Champions. Copyright © Restrictions
DC Electricity - Homework Answers
After you have completed the DC Electricity Homework, you can refer to these answers. Although it is better to have known the answer from your reading, the process of writing the correct answer on your homework sheet will help you remember the concepts.
1. What determines if an atom has a negative charge? A positive charge?
If there are more electrons in orbit than the atomic number, the charge is negative. If there are missing electrons, the charge is positive.
2. Name a good insulator of electricity. Name a good conductor of electricity.
.Rubber, plastic and wood are good insulators. Any metal is a good conductor of electricity.
3. Comparing electric current to the flow of water in a hose, what is a volt equivalent to in the water hose? How could you increase the "voltage" in a hose?
A volt is like the pressure. To increase the pressure, you open up the faucet more.
4. What is an ampere equivalent to in the hose? How could you increase the "amps" in a hose?
Ampere is like the amount of water flowing out the hose. You could get more water by having a bigger hose. (Note that if the water pressure increased, the water would come out faster. That is where this analogy breaks down, to a degree.).
5. How do you increase the resistance in a wire?
Increase the length or decrease the diameter..
6. What is the relationship between current, voltage and resistance in a simple electric current?
Voltage = Current x Resistance (V = IR).
7. If a 9 volt battery lights a bulb of 4.5 ohms, how much current flows through the bulb?
2 amps.
8. Why are Christmas lights in a parallel circuit better than in a series circuit?
So if one goes out, they all don't go out.
9. What is the most common source of direct current?
A battery.
10. What device could you use to measure voltage?
Voltmeter.
Where can you go from here?