0

# Where can you find answers to tpc training systems tests?

In the training manual. One has to read it and possibly reread it, highlight it, take notes on it.

where can I get a john deere 4300 wiring diagram

# How do you identify start and run windings of a motor?

The run winding of a single phase capacitor start motor has a lower resistance than the start winding.

# What do you do if your cell phone screen has gone blue?

i am 6 grade and long ago i dropped my phone in a cup of water. it did not work for a long time so i put it away for like months. well i wanted to use it again so i got it and put it in the frezzer for like 4 or 5 minutes chargerd it and now it works even better. put it in the frezzer if water damanged if worked for me.

# Why is a fiber optic cable connection faster than a twisted pair cable connection?

In the twisted pair cable connection, the communication occurs over wires which offer resistance that make the connection slow. However, the fiber optic connection uses cylindrical glass that does not have any resistance making it the fastest connection channel.

# How do Convert ton to watts?

When talking about refrigeration, a ton is a unit of power. To quote wikipedia:

"In North America, a standard ton of refrigeration is 12,000 BTU/h = 200 BTU/min ≈ 3,517 W. This is approximately the power required to melt one short ton (2,000 lb) of ice at 0 °C in 24 hours, thus representing the delivery of 1 ton of ice per day." (http://en.wikipedia.org/wiki/Ton)

# How do you find kva?

k is 1000

V is volts

A is amps

basic algebra kVA = (V * A)/1000

120 Volt with 20 Amp would be: (120 * 20)/1000 = 2.4 kVA

# What does t1 stand for in electrical terms?

On a schematic for an electronic circuit it usually means a transformer. T1 is the 1st transformer, T2 is the second etc. Some ferrite core wire wound inductors with more than one winding may be designated as T1.

# What DMV voltage range do you use to measure house current voltage 110V or 120V?

You must set the range so that the maximum value is greater than the conventional voltage levels in your house. Like, in the United States, the common voltage level is 120 volts RMS, although many homes are equipped with 240-volt service, to accommodate certain appliances, like clothes dryers. (The 240-volt service is really two 120-volt legs.) It's a good idea to set the range higher than expected initially.

# Where is the heating element in a dryer?

If the element has failed you will still have 240V going to the element itself: it just won't be causing the element to heat up.

Make sure the dryer is unplugged!

Then take the back off the dryer and pull the element out - it's usually held by just a few screws.

BEFORE YOU UN-CLIP THE WIRES FROM THE ELEMENT write down which wires for the element go where. The wires have clips that will slide right off the element.

Take it to your local hardware or appliance store with the dryer's make, model number and serial number. (That information can be copied from the appliance's rating plate which is may be on the back panel and/or may be fixed just inside the front door.)

Buy a new element which is an exact replacement for the old one and put it back into the dryer in the reverse order that you took out the old one.

<><><>

As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

# Why is a plug live wire brown?

I've been trying to find a satisfactory answer to this through a casual search on the web and nothing jumps out at me immediately which amazes me!

What idiot sitting on some "standards committee" somewhere thought that brown would be a good colour for a live wire?

For starters brown is the colour of earth, so anyone knowing nothing about electricity would assume that brown is earth and that live must be that fancy coloured green and yellow wire with fatal consequences no doubt.

Nature gives us natural warning and danger colours and they are typically vivid colours or unnatural contrasts - such as green and yellow in snakes! Red is also a classic danger colour and means "stop" on traffic lights etc. So...why is the live wire not red ?

From my dim and distant past I can vaguely recall messing around with plugs and wires and in those days I remember the live wire in the UK as being red. So...what caused the change? I suspect some crazy dictate from faceless bureaucrats at the so called European Union lol.

The only reason I can think of for this madness is that major circuits which feed directly into the mains, tend to have live as red and neutral as black (earth is green or green and yellow I think). As a means of distinguishing between the two, brown was chosen as a "shade" of red to mean live - though why not choose vivid orange? Why do we need to distinguish between the two types of circuits anyway?

Unfortunately, I suspect that the real answer lies in some legal case where an idiot was working in building somewhere and mixed up the old style red live of a lighting circuit with a red live straight from the mains and frizzled themselves to death. The family sued because they were short of cash and the legal precendent was set that wiring should be re-labeled in colour (because - displaying warning signs near every electrical outlet was deemed unpractical...doh!)

Comment

I think you're probably correct in assuming that it was dreamt up by some idiot in the European Union of Socialist Republics!

# How can definitely we say a capacitor is faulty?

You need a multimeter that is capable of testing micro Farads (uF). The capacitor is normally stamped with this rating. Should get a reading within +/- 5% of the rated value. Some Caps. are polarity sensitive so make sure your +/- leads from your meter are correct

# What is a ground loop isolator?

Ground loop isolators are used to break the DC circuit path for the audio shield ground circuit. It removes ground loops from the system, which are unwanted.

# What does 24vac 50va equal to in amps?

In 50 VA the V stands for volts and the A is for amps.

Hence the formula you are looking for is 50/240 = Amps.

# Will a 208 volt rated appliance work on a 240 volt feed?

No, there is over a 15% difference in voltage supplies. This means that the current supplied to the 208 volt equipment will also be 15% higher. Take a 4000 watt range. I = W/E 4000/240 = 16.6 amps. 4000/208 = 19.2 amps. A 240 volt appliance will run on 208 volts but as you can see from above equation the range elements will not get as hot at the lower voltage.

<><><>

To get a the answer you have to reckon with the resistance of the appliance. A 4000 watt appliance running on 208 volts takes 19.2 amps, so from Ohm's Law R = E/I, its resistance must be 208/19.2 = 10.83 ohms.

Again using Ohm's Law I = E/R, the current that resistance takes at 240 volts must be 240/10.83 = 22.16 amps. So the power drawn will be 22.16 x 240 = 5,318 watts.

If it is a cooking ring or a heater, that power may cause the temperature to rise so much that its element could glow dangerously white hot and, at best, it may then melt or burn away with lots of smoke and heat. If it was some other appliance it may well overheat so much that it simply catches on fire. So the real risk here is that, if left unattended, the higher voltage could cause a house fire.

<><><>

As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

# What does L1 L2 and N mean in electrical terms?

L1 and L2 stand for "Line 1 and Line 2". These are the two incoming hot legs of a single phase, 220V electrical supply as is typical for residences.

The N stands for the neutral or grounded conductor. This is the white wire in a residential system.

Since L in electricity stands for inductance, L1 and L2 could also possibly be inductor 1 and inductor 2. And the N in electricity means Number of Turns (of the copper wire into a coil). Therefore, it could be about residential wiring or inductors.

# Why does one end of the battery have a negative symbol on it?

because batteries works on the principle of electron charge and an electron can have either a more positive or negative charge but the electron wants to have an equal amount of pos. and neg. charge so when batteries are simply they pull the positive charge to one side and negative to the other side and when they come together with a conductor(wire) it creates a current which does the "work" for you. The voltage of the battery pretty much lets you know how strongly the battery wants to create equality between each side thus more current.

# How much voltage does it take to injure someone?

That is difficult to answer because there is no fixed answer. As an experiment put both terminals of a 9V battery on you tongue. It will not hurt you but you will surely feel it. Now put your thumb across the terminals of that same battery. Two things should now be obvious to you: 1) that even low voltages can "hurt" you under the right conditions, and 2) voltage is not the only factor that determines how harmful.

# Which is the positive wire between solid black and black with white stripe?

White is neutral in home wiring. Red is sometimes used in 3-way switches and dimmer applications, so it is likely red is hot in your application if it pertains to home wiring. The term positive would just apply to DC wiring since AC goes positive and negative. For example your car battery has Red as Positive and Black as Negative.

# How can you supply 220v machine to 208v supply?

Most 220 volt equipment will work on 208 volt supply. If the machine has a resistive load then the watts output will be lower than if supplied from a 220 volt source. If it is a motor load you will find that the equipment may run a bit slower but most motors will take the lower voltage. If the machine is a plug in device, install the appropriate receptacle to match the pin configuration and plug it in. If it is a hard wire installation this should be done by a qualified person.

# How electric tester works?

There are many types of electric testers in use. One kind is a two contacts tester where there will be two connecting leads and one or more neon lamps to indicated the presence and approximate magnitude of test voltage. Here one contact is placed on the wire to be tested and the other lead is placed on the reference level like ground or other circuit parts.

Another kind is a one contact tester which usually is in the form of a screw driver. The end portion is placed in contact with the wire to be tested and the back of the tester is touched by a body part. A neon lamp inside the transparent tester body will glow if the wire is live. The lamp needs only very little electric current to glow that, it uses the capacitance and resistance of the human body to complete the circuit by making a current flow to the ground.

# How many ground rods are needed for a 100 amp service?

If you're asking this, you shouldn't be installing an electrical service. --- This type of question usually means you aren't ready to do this yourself. Study some electrical material and the National Electrical Code and work this answer out for yourself, or call a professional electrician. If I were to give you an answer, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or their life.