SMT FINAL EXAM QUESTIONS AND ANSWERS
M. Faraday told us about electromagnetic induction in 1831. What is electromagnetic
induction and what is it used for and how does it work? - Answers- it is an electric motor
generator and whole new concept of energy. It changes in magnetic field per time is
proportional to electric power
Clausius told us about the second law of thermodynamics and entropy. Later Maxwell
explained entropy as ___. - Answers- disorder (randomness)
Why is efficient communication necessary to insure rapid improvements in technology -
Answers- rate of change is proportional to rate of information exchange
How did Thomas Edison demonstrate the dangers of using alternating current (AC)? -
Answers- Electoculed animals w/ AC to demonstrate its dangers
What is mathematic equation relating power (watts), volts, and current (amperes)? -
Answers- Power= current x voltage or Pi= i x v)
What is AC? - Answers- is generated at the power plant
What is DC? - Answers- comes from a batter, fuel cell or solar cell and does not
fluctuate
Why is AC the preferred form of electricity for our electrical power grid? - Answers-
Large electrical generators happens to generate AC, it is easier to change AC to DC but
difficult and costly to change DC to AC
Since power = current x voltage, if power is 1000 watts and the voltage is 100 volts then
what must be amperes - Answers- 10 amps
If power is 1000 watts and amperes is 1 amp then what is the voltage? - Answers- 1000
volts
Why is electricity transported from from the power station at high voltage - Answers-
high voltage gets lower current thus less power loss through the power grid.
How does an AC transformer work? - Answers- Primary coils 5 turns, secondary coils
10 turns, input voltage 110 v, output voltage 220v.
What are the 8 technological developments according to James Burke? - Answers-
Nuclear power, telecommunication, computer, assembly line, jet engine/air transport,
plastic /synthetic polymers, liquid fuel rocket.
M. Faraday told us about electromagnetic induction in 1831. What is electromagnetic
induction and what is it used for and how does it work? - Answers- it is an electric motor
generator and whole new concept of energy. It changes in magnetic field per time is
proportional to electric power
Clausius told us about the second law of thermodynamics and entropy. Later Maxwell
explained entropy as ___. - Answers- disorder (randomness)
Why is efficient communication necessary to insure rapid improvements in technology -
Answers- rate of change is proportional to rate of information exchange
How did Thomas Edison demonstrate the dangers of using alternating current (AC)? -
Answers- Electoculed animals w/ AC to demonstrate its dangers
What is mathematic equation relating power (watts), volts, and current (amperes)? -
Answers- Power= current x voltage or Pi= i x v)
What is AC? - Answers- is generated at the power plant
What is DC? - Answers- comes from a batter, fuel cell or solar cell and does not
fluctuate
Why is AC the preferred form of electricity for our electrical power grid? - Answers-
Large electrical generators happens to generate AC, it is easier to change AC to DC but
difficult and costly to change DC to AC
Since power = current x voltage, if power is 1000 watts and the voltage is 100 volts then
what must be amperes - Answers- 10 amps
If power is 1000 watts and amperes is 1 amp then what is the voltage? - Answers- 1000
volts
Why is electricity transported from from the power station at high voltage - Answers-
high voltage gets lower current thus less power loss through the power grid.
How does an AC transformer work? - Answers- Primary coils 5 turns, secondary coils
10 turns, input voltage 110 v, output voltage 220v.
What are the 8 technological developments according to James Burke? - Answers-
Nuclear power, telecommunication, computer, assembly line, jet engine/air transport,
plastic /synthetic polymers, liquid fuel rocket.
