Homework 3-1 Solution

Lab 1-1: Fundamentals of Electricity

 

Definitions

 

1. Atom: Smallest basic unit of matter

2: Mater: Anything that occupies space

3: Element: Basic building block of nature

4: Compound: Combination of two or more elements

5: Proton: Positively charged particle in the nucleus of the atom

6: Electron: Negative charge in orbit around the nucleus of an atom

7: Valence shell: The outer electron shell of an atom

8: Ionization: The process of gaining or losing electrons

9: Coulomb: Unit of electrical charge - represents the charge of 6.24x10¹⁸ electrons

10: Difference of potential: The force that moves electrons in a conductor

11: Electromotive force: Another name for difference of potential

12: Voltage: Another name for difference of potential

13: Resistance: Opposition to electron flow in a circuit

14: Conductor: A material that contains a large number of free electrons

15: Insulator: A material that has few free electrons

16: Ohm: Unit of resistance

 

Questions

 

1. Symbols used to represent

    Current: I

    Voltage: V or E

    Resistance: R

 

2. What unit is applied to the following measurements

    Current: Ampere

    Voltage: Volt

    Resistance:  Ohm

 

3. What symbol is used to represent the unit of

    Current:  A

    Voltage:  V

    Resistance: W

 

Lab 1-2: Current

 

Definitions

 

1. Coulomb: Unit of electrical charge - represents the charge of 6.24x10¹⁸ electrons

2. Current: Slow drift of electrons

3: Ampere: Measure of current flow

4: Hole: Absence of an electron. Flows opposite of electron flow

5: Scientific notation: Use of powers of ten to express large and small numbers.

6: Milliampere: 1-thousandth of an ampere

7: Microampere: 1-millionth of an ampere

 

Questions

 

1. What letter symbol is used to represent current: I

2. What is the unit of current: Ampere

3: The unit of current is represented by what symbol: A

4: What does I_T represent: Total current

 

Lab 1-5: Unit Conversions

 

Convert the following values to the unit indicated: Show all work.

 

1. 1 A    1000 mA        

2. 2.2 kW    2200 W

3. 1.2 MW  1200 kW

4. 5,600 W    5.6 kW

5. 1,000 mW    1 W

6. 1.2 mA    1200 mA

7. 150 mA    0.150 A

8. 10,000 V    10 kV

9. 1 MV    1000 kV

10. 0.47 kW    470 W

11. 0.010 kW    10W

12. 15.5 mA    0.0155 A

13. 575 mA    0.000575 A

14. 4.2 MW    4,200,000 W

15. 205 mA    0.205 mA

16. 2.1 W    2100 mW

17. 3 mV    0.000003 V

18. 1.2 MV    1,200,000 V

19. 470 W    0.47 kW

20. 0.12 kV    120 V