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FAQ

I just heard tapping noises coming from the back door. The back door leads to the laundry room and multiple storage rooms. There is also all the heating and electrical equipment down there. The leak is coming from a pipe at the ceiling in a storage one, the room beside all the electrical equipment. The floor is soaked and the water is leaking a lot. Am I in danger?

Are you in danger only if the water comes in contact with electrical wires yes have the pipe repaired call a plumber don't wait til Monday when it will be cheaper because it won't when the ceiling collapses some one may get hit with plaster board and the. You wind up with an even bigger hole . The longer you wait the more it will cost. Especially if a fire were to start remember water and electricity don't play well together some one can be electricuted

Hey Guys !I just finished High school and I'm quite certain that Engineering is my first choice, however, I'm still a little bit hesitant. I'm choosing between electrical or mechanical! I think I like both majors and as far as I know Mechanical is the science of moving objects where you can get more hands-on experience , while electrical engineering is more imaginative. You can't really see electricity , thus it's more challenging ! To be honest , I like challenges but I don't want to end up regretting any decisions! Can anyone give me any insights , advices or opinions on both of majors ! What I'm going to study , what can I do , anything that could practically help me decide ! Thanks in advance

Mechanical engineers have more opportunities.

during line to ground fault, is there really a current that will flow in the ground, how will the grounding rod help if there is no connection back to the source? please explain how grounding aids tripping of C.B's

The earth really is a conductor. In the US homes, power is fed from the grid as single phase voltage the voltage between the two power conductors is approximately 220 volts AC. At the power plant one conductor is connected to the earth (called grounding in the US, and earthing in some countries). At the residential service connection there are three terminals. The center terminal is connected to a ground rod. Because the earth is a conductor, this provides a path back to the generating plant. The power wires are connected to the other two terminals. Voltage measured between the outer terminals shows 220 volts. Voltage measured between either outer terminal and the center one shows 110 volts. Three wires are run to a branch circuit panel containing circuit breakers. A wire (called hot) feeds 110 volts from a circuit breaker to points of use. Another wire, (called neutral) returns current to the branch circuit panel. A third wire (ground) also goes back to the branch circuit panel. At the point of use, this third wire is connected to conductive parts of appliances, such as a metal kitchen stove. It is a safety feature. If a bare hot conductor were to make contact with the metal, enough current would flow to trip the circuit breaker, removing voltage from the circuit. Imagine this. By its nature plumbing is connected to ground. In this case there is no third wire. A hot wire in a toaster accidentally touches the housing on a toaster. There is no ground connection so no current flows. But there is 110 volts on the toaster housing. The homeowner has one hand on a faucet handle, and reaches over to wipe the toaster. He could be killed. Check out the link for more info.

Also, do students studying to become either one of these need to study things like how to program an java and stuff?

electrical engineer deals with electrical equipments(like motor,drive,plc),automation process etc and a mechanical engineer deals with mechanical equipments (like compressor, refregeration,air conditioning engine etc) both of the engineers need to know programming language. but it is not necessary to learn java

Are you taught job skills required to work for a company? or are you trained to specifically do a job like they trust your knowledge and teach you specifics?

Simply put: You are expected to know all the ways the job can be done. They will tell you which way they want it done.

I have a garage full of my dad's old equipment from oscilloscopes, amplifiers, circuit board materials, etc. that I don't know what they are/or are worth, or how to go about selling. Does anyone have any suggestions other than listing everything individually (there is a lot) on OKorder or CraigsList? I'm leaning towards hiring someone to come in and auction it all off for me, but need suggestions.Thanks!

You might be able to list on OKorder (or CraigsList) as a LOT. Sell all for a set price, with pictures and text til you get tired of doing it. I expect you would not get so much money, but it might be easier. Since the stuff is related, some single bidder might be interested in several of the pieces. You might also offer something like winning bid gets pick of any seven single items or some such intermediate solution. You might also find a Radio Amatuer or Ham. They have 'hamfests' where they sell and trade such things.

A company specializes in manufacturing electrical equipment. Recently, several long-time customers have complained about the quality of the equipment. It seems there are several damaged goods. The defective equipment should have been caught when the boxes were packed. The manager is wondering which of the three packers is not doing the job properly. Clerk 1 packs 40% of the boxes and usually has a 2% defective rate. Clerk 2 packs 30% with a 2.5% defective rate. Clerk 3 boxes 30% of the boxes and her defective rate is 1.5%. Which clerk is most likely responsible for the boxes that raised the complaints?

clerk 1; 0.4(0.020) 0.0080 clerk 2; 0.3(0.025) 0.0075 clerk 3; 0.3(0.015) 0.0045 answer: clerk 1

for an electrical class.

Proper PPE Proper use of tools Proper work practices on energized gear Proper lockout/tagout How to verify equipment is deenergized Body's resistance to current in different situations amount of current required to kill someone Arc Flash safety