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Flashcards in Lecture 1 Deck (9)
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0
Q

Ac advantages

A

Sustained at high voltages for long distances. Stepped up or down using transformer. 120V or 240V

1
Q

Difference between ac and dc current

A

Dc:flow of charge in one direction, fixed polarity, can be steady or vary in magnitude. Loses power over a mile due to decreased voltage drop.

Ac: polarity reverses or alternates, varies in magnitude between polarity reversals

2
Q

Reynolds number

A

Re= (mean velocity x density x diameter)/viscosity under 2000 is laminar over 2500 is turbulent

3
Q

Electrocution are the blank most common in U.S.

A

5th

4
Q

Amount of people that die each year from electrical accident

A

700

5
Q

Amount of residential fires each year from elec.

A

40000

6
Q

Amount lost on property damage each year

A

2 billion

7
Q

Hospital patients electrocuted in 1972

A

1200

8
Q

Injuries and death in hospital in 1971

A

1600 injuries and 100 deaths