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Electrical Engineering

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

23,056 Questions

Why are moving iron test instruments not used with DC although they can work in DC?

For moving-iron instrument magnetic field is caused when the current (voltage) passes the fixed circle. When the current (voltage) passes the fixed circle,the two iron plates are magnetized ,rotational torque is resulted, the deflection angle indicate measured current. Because the magnetized polarity is same for AC or DC, moving-iron instrument can be used in AC and DC circuit. For permanent-magnet moving-coil instrument magnetic field is caused by the permanent-magnet, When the DC current passes the moving coil, rotational torque is resulted,so the deflection angle indicate measured DC current. As AC current passes the moving coil ,because inertia of moving parts of meter the deflection angle indicate rotational torque average, but rotational torque average is zero in cycle, moving parts of meter is´t deflec,so permanent-magnet moving-coil instrument only is used in DC circuit.

What can you do if you have a chronic illness that has limited the amount of time you can work and you have fallen behind on your payments?

You need to make arrangements for other transportation. A car in default wont be with you long. Im not being mean, just stating facts. Practical.

Where is the starter motor for a 2000 Toyota Tacoma?

Everyone should have a manual for their vehicle, and a professional shop manual should be available at your local library for diagnostic procedures etc, just make copies of the right pages, as they are usually REFERENCE only...read up and good luck :) You can find the starter on the passenger side of most tacomas through the fender which you would have to remove the rubber or plastic cover going across the fender. Its not hard to remove that it only has locks that pop out. Now to replace the starter is a whole different story. It should be easier on a 2wd than a 4wd. Now I replaced one on a 4wd v6 3.4L tacoma. There is only two bolts holding the starter in place which are pretty difficult to get to on this model. I had take off the top off the transmission fluid dipstick and loosen (take the nut and washer off) the 10 inch bolt that runs across the top of the coil spring and drive the end with the nut almost all the way to where you can't see it. Now if you do this you MUST tighten it to the required foot pounds with a torque wrench and I STRONGLY recommend you use the blue lock tight compound as well as as putting it to the right ft. pounds. Now I THINK (not too sure but I would check a manual in the specifications section for reassurance) it was like 88 ft. pounds. Now If you do have to change it in this fashion ALWAYS keep an eye on that nut and washer because it is a fine threaded metric nut with a special designed washer that will cost $10 from the dealer (cheaper IF you can find one at a junk yard to snatch up. If you ever hear a pop that you can feel a little vibration in the steering wheel or just a loud pop that aounds like you left a socket under the hood and it fellout. Its not a socket its that nut working loose but if you tighten it up right with lock tight as well you shouldn't have any problem but I still check cause when that nut was missing that was real scary. Oh and don't get the idea of taking part of the exhaust off because then you might have to rethread nuts and possibly cause an exhaust leak. If I was you though I would have a manual handy because its a big job that wouldn't be fun to do with out some reference. Though a book won't say to loosen that piece that was something I figured out on my own. Though you shouldn't have to do that an a 2wd model. I hope this helps a bit more than that first explaination. If not post a question on it and Maybe i will see it and respond. Oh if your wondering what the difference id in blue and red lock tight. Red needs heat to loosen again and blue just needs a good wrench.

Can you run a disc man off of an AC DC adapter that puts out more power than is needed?

Hi,

IF the voltage rating is the same, the output in current (most likely in milliamps or ma) of the adapter is relatively inconsequential as long as it's at least what the Discman originally required, or a bit higher.

For instance, if the Discman requires 6 volts at 250 milliamps (250 ma) and you have a 6 volt adapter that has 475 ma. available, you should be able to run your Discman off of it with very little problem.

Also be sure that the different adapter has the same polarity at the plug as the original though, or it could be catastrophic.

Hope this helps,

Cubby

What is saturation in current transformer?

When the curent Is in the secundary for the highervalues Ip in the primary coil are not equal proportional than for the lower curent. Is/Ip for lower values is for exemple 100 Is/Ip for higher values are for exemple 70

The reason is the magnetique flux saturation in the closed iron core.

Roger

What do you mean by integer multiples of frequency?

These are called harmonics. If you have a signal at 60 Hz, then there may be harmonic signals (typically of lesser intensity) at 2x, 3x, 4x, etc. of the base frequency. So these would be at 120 Hz, 180 Hz, 240 Hz, etc.

Difference between tubular battery and lead acid cell?

Well, tubular tells you that it's tube shaped, like a section of pipe. Batterytells you that it has more than one cell.

Lead acid tells you that what chemistry it is - lead-acid - and cell tells you that there's only one section to it. Knowing the number of celss and the chemistry means that you can figure out which voltage it should have when fully charged etc.

Now, to make things maybe a bit more complicated, you could use lead-acid cells to build a tubular battery.

What the BDV stands for the transformer oil?

Blowdown Valves

In case of Transformer oil the meaning of BDV is break down voltage. It refers to the one of the tests of the oil.

Effect of q factor on maxwell inductance bridge?

the bridge is preferably balanced by capacitor parallel attached resistance value. so, q factor of the inductor is given by w L / C at balance condition. q-value is low prefer

What is the aftercare for a ventricular shunt operation?

To avoid infections at the shunt site, the area should be kept clean. Cerebrospinal fluid should be checked periodically by the doctor

Where is Volvo 850 horn relay?

towards the front left end of the fuse box it should be fuse number 12.

Why capacitor behave as open circuit against alternating current?

Capacitors store electrical charge.

Imagine we have a capacitor. At time 0 seconds we connect a DC voltage across the capacitor - immediately as the voltage is connected the capacitor is at 0 volts and the maximum current (relative to the circuit resistance) flows. At this extreme the capacitor can be treated as a short circuit, so for high frequency AC volts we should treat a capacitor as being a short circuit.

As time passes the current in the circuit will go down and the voltage of the capacitor will go up - this is because as the capacitor gains more charge it gains more voltage, lowering the voltage across any resistance in the circuit consequently lowering the current in the circuit. When the capacitor is virtually full no current will flow at all and the voltage across the capacitor will equal the DC source voltage. At this extreme the capacitor can be treated as an open circuit, so for low frequency AC (allowing the capacitor to fill up before the current alternates) we can treat the capacitor as being an open circuit.

Technically, it is not an open/closed circuit when it comes to AC because the capacitance will results in a signal lag or lead. However, if the frequency is low/high enough the lag/lead is often negligable.

If you use 1000 kwh in a month what size solar panel system do you need?

It depends on where you live. You want to know how much Sun you get (solar hours). If you live in Southern California or Arizona, you might get 6 hours per day. If you live in Northern CA or Oregon, it might be closer to 4.

First, you take your 1,000 kWh/mo and divide that by 30 to get your kWh/day.

1,000 / 30 = 33.3 kWh/day

Then you divide this by the number of solar hours per day your area gets. Let's say 5.

33.3 / 5 = 6.67 kW

Last you need to adjust for real world inefficiencies. A good rule of thumb is to suppose approximately 75% - 80% inefficiencies. So increase your system a little.

6.67 kW / 0.75 = 8.9 kW.

This is a fairly large residential system, but you can reasonably expect it to cover 100% of your electricity needs if you use 1,000 kWh per month.

Want to know how much an 8.9 kW solar system might cost? Go to and play the solar calculator in the related link below. (Yes, it's free.)

Does anyone produce a linear alternator of around 1 to 1.5 kW commercially?

QDrive is the only company I know which manufactures commercial linear alternators. Visit www.qdrive.com for details. They manufacture linear alternators upto 10 kW. But I guess they are very heavy!

The Umbra Group (www.umbragroup.it) also manufactures linear alternators from 700 Watts to +50 kW. These linear alternators take advantage of the back-drivable nature of ball-screws to amplify the linear input velocity into higher rotary output velocity which is harnessed for electrical power production. Consequently, these units are much smaller and lighter than competing designs.

What is the direction of the magnetic lines of force relative to the direction of electric current?

A: It is called rule of thumb using the right end grab a wire the thumb pointing on the current flow the fingers will point to the direction of flux

What does AC-DC conversion and battery charging mean?

The voltage in your house is AC. It is in the form of a sine wave that goes positive and negative 60 times a second. To charge a battery you need DC so you do an AC to DC conversion and then apply the DC to the battery charging circuit that applies the correct charging current to the battery and checks on the state of the charge.