Electrical Midterm Review (updated)
questions n answers
1. Is silicon a good conductor? Explain your answer - correct answer ✔✔ • Silicon is made up
mostly of glass and although it can conduct electricity it does not do it as well as copper wiring
or aluminum. Valence shells with 3 or less electrons make good conductors. 4 or more electrons
in outer shell are not good conductor
Why is aluminum a good conductor? - correct answer ✔✔ • Aluminum allows for electrons to
freely move through out. 3 or less electrons on outer shell move freely.
What "law" is represented by E = I x R? - correct answer ✔✔ • Ohm's Law.
1. If power is constant, how is amperage affected by an increase in voltage in the power
formula? - correct answer ✔✔ • Amperage decreases for P=E*I
1. Define electricity. - correct answer ✔✔ • Movement of electrons
1. Which of these is the best conductor of electricity; aluminum foil, lego block, rubber ball,
toothpick? - correct answer ✔✔ • Aluminum foil
1. Define current. - correct answer ✔✔ • Flow of electrons in a circuit
1. How many 90W exhaust fans can you put on a 20- amp, 120-volt, circuit if you load it to 80%?
- correct answer ✔✔ 21.33 Fans
1. What is the current at each fan in question 9? - correct answer ✔✔ 0.75A
questions n answers
1. Is silicon a good conductor? Explain your answer - correct answer ✔✔ • Silicon is made up
mostly of glass and although it can conduct electricity it does not do it as well as copper wiring
or aluminum. Valence shells with 3 or less electrons make good conductors. 4 or more electrons
in outer shell are not good conductor
Why is aluminum a good conductor? - correct answer ✔✔ • Aluminum allows for electrons to
freely move through out. 3 or less electrons on outer shell move freely.
What "law" is represented by E = I x R? - correct answer ✔✔ • Ohm's Law.
1. If power is constant, how is amperage affected by an increase in voltage in the power
formula? - correct answer ✔✔ • Amperage decreases for P=E*I
1. Define electricity. - correct answer ✔✔ • Movement of electrons
1. Which of these is the best conductor of electricity; aluminum foil, lego block, rubber ball,
toothpick? - correct answer ✔✔ • Aluminum foil
1. Define current. - correct answer ✔✔ • Flow of electrons in a circuit
1. How many 90W exhaust fans can you put on a 20- amp, 120-volt, circuit if you load it to 80%?
- correct answer ✔✔ 21.33 Fans
1. What is the current at each fan in question 9? - correct answer ✔✔ 0.75A
