Electrical Safety Quiz

mickeyco

Found this question with these answers on a different site.

If an electrical appliance falls into the the water, the first thing to do is:

A. Unplug it, then take it to a service center.

B. Call 911, then take it to a service center.

C. Take it out quickly, and take it to a service center.

ABLE1

Ok, I will be the first to bite.

I would say that depending on the device, toaster, hair dryer, modem, vcr, cellphone, x-box, tv remote, or cell phone and if the GFCI would have killed the power then answer A or C would apply but never B.

I think these types of questions have a serious lacking of effective information to make a logical answer. It does make you think, which is always a good thing.

I am now waiting for others to get in here and explain their answer to a level that will only confuse the masses.

Les

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ABLE1

CE1

Throw it in the trash and buy another one. It will cost you more to fix than it would to buy another one. Also DO NOT try this at home. DAQ IMHO

JamesNLA

I'll just ASSume you got this question from some sort of service center website?

CE1

Lets all play Jeopardy!
The answer is: 746 watts

(MD you cannot play)

mickeyco

The correct answer is: (According to UL)
Unplug it, then take it to a service center.

The quiz is from Underwriters Laboratories website, it's question #3, I was thinking make sure the power/breaker is off, then unplug, throw it out or have it fixed.

http://www.ul.com/consumers/quiz/Quiz.html

DAVIS081404

What is 1 HP?

Sparky Joe

What is one single phase horse power, Alex?

Teetorbilt

3.86

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You can't solve you're problems with the same level of thinking that created the problems.

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mdshunk

Joe... were you thinking a horsepower would consume less energy with three pushes per rotation (3 phase)? Not. Watts is watts, regardless of the source. You could measure the power of a water wheel in watts or the power of a runner or bicyclist in watts if you wanted to. 746 watts will still be one horsepower, no matter the source.

DAVIS081404

Single phase Horse Power??????

DAVIS081404

Single phase Horse Power??????



Thanks MD

Sparky Joe

Hmmm........searching.......searching........

I know I have the formula in one of these books.

But to find 3 phase horsepower somewhere in the formula is the 1.73(3 phase equvalent to single phase) and also the efficiency.

Got a question for yall now; Why does my shaop vac though plugged into a 15 amp receptacle advertise 5 horsepower, when obviously that would equal over 30 amps?

mdshunk

Because consumer products are rated in peak horsepower or surge amps or surge watts as a way of fooling the consumer. Look at actual data plate amp draw and do the math for yourself for the real scoop.

mickeyco

It probably says 5 "developed" horsepower, and it's a crock.

mdshunk

amps will change, but not the watts. Else, the whole world would be on 3 phase or 10 phase or zillion phase or whatever. Heck, get enought phases, and we'll all have free power.

Teetorbilt

Wasn't Tesla working on that?

__________________
You can't solve you're problems with the same level of thinking that created the problems.

Albert Einstein

mdshunk

I'm not sure how much he worked on and how much he just posed, catering to his own mental illness.

Sparky Joe

Tesla a nut or a genius. I claim genius.

Heard in school he had his coils above the ceiling in his lab, then simply had flourescent tubes supended from the ceiling with no fixture connected to them. Don't know how efficient that would be, but we have one at school and just get a tube withing 2 feet and it lights up.

I understand what you say about watts being watts MD. But you get 73 percent more watts out of the same volts and amps versus single phase. If not (directly what you said above) why wouldn't everything be single phase? Do we just enjoy running all that extra wire because we are electricians?

Fact is it was deemed long ago by the military that 3 wires compared to running 4 or a zillion(phases), was the most effective and efficient(closest to DC). I think (though don't quote me on this), as most electrical phenomena there is a curve where each step only gives a gain of 63%, in which even with a zillion increses you'd never reach 1, but at three steps we get 73% which is good enough.

Sparky Joe

In fact just look at Table 430.248 and 430.250;

single phase, 230 volt, 1 horse = 8 amps (1840 watts)

three phase, 230 volt, 1 horse = 4.2 amps (966 watts)

Now that I look at it, don't know it's claimed that 746watts equals 1 horse if the code doesn't see it that way.