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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
What does AC DC stand for in science?
AC or Alternating current, DC or Direct Current.
DC is relative to most battery voltage systems, cars, pocket radios, so on. Alternating Current mainly relates to your household electric.
Each differs in the way the electric is passed through the system, or battery.
Unless your talking about the Rock Group, then I do not know there meaning or definition. Groups have there own language for things like that.
It does not stand for After Christ / Devil Comes.
What is piecewise linear model?
A piecewise linear (PWL) model can be used to simplify a problem, by replacing a complex model with on that is made up of simpler (linear) pieces. For example, the IV curve for a diode is Id = Is( exp(Vd/n*Vt) - 1). Quite messy. We can instead represent the curve by two pieces. One where the current is zero from 0V, to arround 0.5-0.7V. From here, we approximate the exponential curve with a linear relationship. This linear region is typically fixed on a point on the exponential curve known as the operating point, Q. See link.
If your stove has a power rating of 2000 watts how much current does it draw from 200 volts source?
Remember I = W/E
The frequency or rate of precession of the nuclear magnetic moment (spins) and is proportional to the magnetic field strength. Radio waves of the Larmor frequency are used to produce RF pulses. here is the link where I got this information. www.elp.manchester.ac.uk/pub_projects/2000/mmmr7gjw/glossary.htm then select the L letter
How do you troubleshoot generator that fails to supply ac voltage?
You first use the schematic diagram in the equipment service manual to understand the flow of the power and signals in the generator.
The first thing to check is all of the power supply voltages. If one is missing, the generator can fail in such a way as to produce no output.
Then you can use an oscilloscope to trace the problem backwards, from the output connector of the generator to to the source of the signal generation.
State principle of moving coil galvanometer?
Principle of Working:
A Moving Coil Galvanometer works on the Electromagnetic effect of current carrying coil (free to move) being placed in an air-gap between the soft iron core and the strong pole pieces of the magnet.
The current following in the moving coil which is the specimen to be sensed or measured results in a generation of a Magnetic Field which is opposite to that of the fixed magnetic pole pieces. And as like poles attract each other results in a generation of small deflecting torque which further deflects the pointer or the mirror attached to the axis of the coil.
Construction:
Moving Coil:
The Moving coil which is free to move is being suspended from a soft metallic (non-magnetic) strip carrying the current specimen which is to be sensed or measured. The Moving coil is being suspended in the air-gap available between the fixed Soft Iron-Core and the fixed pole pieces of the magnet.
The Soft Iron Core is used to provide a path of low reluctance so as to focus the magnetic field generated by the fixed magnetic pole pieces towards the moving coil. The use of low reluctance Soft Iron-Core helps to increase the sensitivity of the Galvanometer as well.
In many of the Moving Coil Galvanometer Construction Soft Iron-Core pieces are removed and this results in the reduction of the sensitivity of the Galvanometer as a whole. In absence of the soft fixed iron core in the middle of the coil the coil then is narrowed in order to reduce the free air space, this narrowing of the coil results in the reduction of the Moment of Inertia(MI) of the moving coil arrangement. This results in having a good near to critical damping with very less oscillations.
The Moving coil consists of a large number of turns wounded on a former which can either be in rectangular or circular in shape. The current carrying coil is made up of a thin non magnetic metal so as to have low resistance and less mass.
Damping:
Damping in Moving Coil Galvanometer is provided by an Eddy current damping mechanism. The damping is made as such to have a nearly critical damping by setting the device to be between under-damped and critical damped case.
Controlling Torque:
Spring Control mechanism is largely utilized to provide the suitable controlling torque.
Which Capacitor should be connected in one direction?
The electrolytic capacitor should be connected in only one direction.
Calculate the power loss when the voltage is 120 volts and has a resistance of 230 ohms?
By Ohm's law, 120 volts across 230 ohms is 0.522 amps. By the power law, that translates to 62.6 watts. You ask about power loss. In order to answer that, you need to provide more information, such as some change in configuration, or some other component. Please review and restate your question.
The current in a wire is determined by what?
an ammeter can be used to measure current flow, either direct insertion type, where the circuit must be opened and the meter is inserted in series with the load, or a clamp on type.
What are the disadvantages of a K Type Thermocouple?
As it is K type has no disadvantages. It has a larger range. Use it with in that range
Why is a dual line braking circuit used in preferance to single line system?
A dual line system is a safety item. If a brake line/brake hose lets go you will still have brakes on one axle, you may not stop on a dime but it will stop you. A single line system will leave you with out any brakes at all if one brake line/hose lets go. American made cars have had a dual line systems since 1968.
How much does a drill press cost?
A small bench drill press often costs less than $90. The larger floor models with a thicker column and wider throat are about 400.
What is the substitution of variables using the ohm's law?
Using the equation for the power dissipated by a resistor and Ohm's Law V=IR find the expression for power that involves only current and voltage.
using the method of substitution of variables, find a solution to the problem statement above
What are an alternative set of units that could also be used to express power.
Intelligent stepper motor controller with RS232 or CAN 2.0?
UIrobot featured Stepper Motor Controllers size only 42.3mm*42.3mm*13.5mm which include Parallel, Serial and CAN Protocol type Stepper Controllers for directly mounting onto size 42/57/86/110 and so on stepper motors. Super compact volume, high performance, standalone or integral usage, easy wiring, strong driving force are the feature of our products. Till now on, UIM stepper controller can use 10V-40V DC supply and drive 8 amps. High voltage supply to 80V and 32, 64 microstepping is coming to the market very shortly.
in series
How is power factor improved in fluorescent lamps?
the old ones with transformers you can correct with capacitors
incandescent lamps have unity power factor
the newer florescent ballasts are closer to unity but tend more towards capacitance
How can you have 3 devices that run on 2400 watts each on a 10 amp circuit?
Watts = Volts x Current x Power Factor. Power Factor is one for resistive loads and less than one for reactive loads. If you assume 80% load factor on your 10 amp circuit that is 8 amps. So each of three devices would have to operate on 2.66 amps. To do this the applied voltage for each device would have to be 900 volts.
At no load, the speed of a series motor rises to a run-away condition if the full voltage is applied because the applied voltage appears directly at the terminals of the motor and drives it to a run-away condition since speed is proportional to the voltage.
we need vacuum to remove moisture from tank
WhVuvbreutpirhete iuat types of parallel circuits are there?
There is one type of parallel circuit. An example of this type of circuit is the electrical wiring in a house. These circuits are generally very complex and have a single power source.
What are the benefits of a Stair Stepper?
Exercising with a stair stepper is a very physically demanding activity. It will definitely tone your legs and make them a great deal stronger, and will make you much more energetic.
Why electrolytic capacitors are used for frequency response of BJT as amplifier?
It can take a lot of capacitance to present a low impedance to a low frequency. Electrolytics offer lots of capacitance for a low price.
How do you set up a PlayStation 3 to play games step by step?
Buy a PS3 and take it home
If you have an HDTV Buy a HDMI Cable also
If you want internet and have an internet service buy a router with or without wireless and one (WiFi connection) or two ethernet cables (ethernet connection)
If you do not have internet service and want the internet Sign up with a Cable or DSL ISP ( Internet Service Provider)
The PS3 can go next to or under your TV if you want it to stand up because of space you also need to buy a vertical stand.
The A/V cable that comes with the PS3 is for 480i or standard connection with two audio and one video plugs that connect to the back of all TVs with RCA plug connections which are color coded and the HDMI goes into the PS3. For HDTVs that you want the best connection and 1080P or any HDTV reception plug an HDMI cable that you purchased into the PS3 and the HDTV.
Plug the PS3 power cord in both locations and you may have to turn the TV or HDTV to the location the PS3 was plugged into with the A/V or HDMI cable.
Plug your Controller into the cable for charging the controller and into the USB port on the front of the PS3. It will work without being charged as long as it is plugged in. You can use the controller to move about the screen that should be on your TV for the PS3
There is a button to push for the game or disc drawer to open and a game can be inserted and will close automatically after you give it a little nudge. Games are expensive and should not be left out of the drawer or there cases. There are also a number of settings you may decide to adjust and it is just too much for me to try to tell all the different conditions. You should go to setting and have your controller shut off with the PS3 or it will just stay on and discharge. The PS3 will not charge your controller while it is off.
How do I connect the PlayStation 3 computer entertainment system to the Internet? has been added for the related link for an internet connection if you are going to have one. It is recommended as the PS3 and it's games were designed for an internet connection but will work without it.
The related link has a video for signing in to the Playstation Network account if you have an online connection How do I create a new PlayStation®Network Master account?
