Electrical Engineering

An AND circuit is a circuit that takes two or more inputs, and generates an output that is the boolean AND function of those inputs. Two light switches in series, for instance, is an AND circuit because both switches have to be on for the light to be on. If the switches were wired in parallel to each other, and then in series with the light, that would be an OR circuit.

If you mean Christmas lights; that was before. Nowadays Christmas lights are connected in parallel.

Which shows a isomer of the molecule below

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The voltage drop should be as close to zero as would be readable by a typical volt meter. If it is measurable you likely have a problem with corrosion or oxidation in switch that is increasing resistance. If you can measure a voltage drop across a closed switch contact, replace the switch.

Or the switch is open, try flipping the switch!

A well designed circuit should be able to operate over a range of voltages, not just at one voltage. Especially a circuit which is intended to be powered by a battery. As the battery starts to get used up, and the voltage drops, you want the circuit to operate as planned.

Whole house generators are used to provide power to the home during power outages. A 200 Amp generator is sufficient to power a whole home, including power intensive things such as Central Air. If you do not care about cooling, you can get by with a less powerful generator.

No, the voltage of 500 volts is too high to operate a 380 volt motor.

Restricted earth fault protection is used to protect a specific zone, and should not trip for a fault outside of that zone (usually limited to a transformer, and possibly extending to lowside, highside, and tertiary breakers).

Stand by earth fault protection is a term I am not very familiar with, but I believe this would be protection that is meant for a specific zone as backup, and can operate for faults outside of this zone. An example might be a highside time overcurrent relay set looking into a transformer, where the transformer is protected by a differential (primary protection), and there is a lowside feeder with relays (primary protection). The highside overcurrent acts as a backup (secondary protection) for the transformer and the feeder, and is delayed due to the nature of a time overcurrent relay.

depends on what you want to test it for. best way is with a multimeter. Radioshack or an electronics parts store will have them I'm replacing a ceiling light fixture attached to 2 3-way switches. Original question clarified: After replacing the switches with the breaker off, I turned it on and checked the wires in the ceiling box. Using a Radioshack Micronta Range Doubler on the AC side, The switches seemed to function normally with each switch capable to turn on and off the circuit from either side. However when both switches are turned off, their is a small current detected in the wires in the box.



The other wiring I have discovered is that the common wiring in the 2nd 3-way switch is also connected to the common wiring of an adjacent unipolar switch (on another circuit and light) in the same box.

inductive reactance= XL= 2*pi*.1*60=12pi ohm

There is no such thing as a 'phase-to-phase' voltage. The correct term is 'line-to-line' voltage or 'line voltage'.

For a star (wye) connected system, the line voltage is 1.732 times the phase voltage, where the phase voltage is measured between any line and neutral.

Category: Equipment for Production of Electronic Components & assembli. This machine is used for making the briquette from the sawdust, straw, hulls, ...

1. Maybe you are using more than you think. Hair dryers really suck a lot of juice. 2. You may have a low-amp breaker with a lot of outlets wired to it. 3. It really depends on how many amps are being pulled vs how many amps the breaker can handle. What you need to do is identify every light and outlet that is wired to that breaker. Next time the breaker trips, leave it off and start figuring this out. Identify every light that is no longer working. Then carry a lamp (better yet, a night-light) around your house and try it in every outlet, identifying the ones that don't work. Before you flip the breaker switch, look at the switch. It should tell you how many amps it can handle before it trips. Overhead light fixture generally suck about 2-3 amps. A celing fan another 2-3 (a combination ceiling fan with light kit, around 5). Add up all the fixtures you identified as being on that circuit, and that's how many amps you are pulling, even when nothing is plugged into an outlet on that circuit. Now, a general rule in electrical wiring is that you're not supposed to have fixtures and outlets on the same circuit. I don't think there's any real danger in doing that, but it just kind of makes it easier to keep everything organized. So it may or may not be true in your house. So you may not have any fixtures at all on the circuit. If you don't, then ignore the lights and ceiling fans. Your load on that circuit is whatever appliances you have plugged in and running at the time. If you DO have fixtures on the circuit, then you can add the amps from those fixtures. Growing up, I lived in a house where the kitchen, bathroom, and laundry room were all on the same circuit. That circuit must have been a huge number of amps to support all that. But nevertheless, if you turned on the hair dryer while the clothes dryer and bathroom vent were both on, it tripped the breaker every time. And the lights went out in all three rooms. Solutions? Well, if turning on your hair dryer is what causes the breaker to trip, you can try drying your hair when other things on that circuit are not operating. Or just plug your hair dryer in to an outlet that is not on that breaker. That's the easiest thing to do. You might also think about putting a bigger (more amps) breaker on that circuit in your breaker box (I suggest you don't do this yourself - hire an electrician). Another option is to change some of the outlets and/or fixtures to another circuit, one that doesnt have as much load on it. This will require some re-wiring, which, with a little bit of knowledge, you can do yourself. But if you are not comfortable with that, then again, hire an electrician. Overhead fixtures aren't so bad because the wiring is usually up in your attic. You just need to identify which wires are on which circuits and divert another circuit to include your fixtures. Also, you need to make sure that the old circuit is still continuous (if there was a fixture in between the breaker and an outlet, or between two outlets, and you took that fixture off the circuit, then you have to complete the circuit between the breaker and outlet, or between the two outlets, directly - make sense?). The thing that you have to keep in mind is that, while you are decreasing the load on one circuit, you are increasing the load on the other circuit, and you don't want to put so much on the other circuit that it starts to trip. Oh one warning. Anything that draw a LOT of amps, like a hair dryer or clothes dryer or chop saw, should never be plugged into any outlet that is on the same circuit with electronic devices (TVs, stereos, computers, DVD players). Even if it doesn't trip the breaker (a potential disaster for some electronics), the current change created by turning the high-amp appliance on and off can damage the sensitive components of such electronics. So-called "surge protectors" are not sufficient for protecting your electronic equipment from this - they only protect against minor fluctuations caused by slight changes in the current coming into your house.

Methane is commonly burned at landfills. It is not siphoned; it is a byproduct of decomposing materials inside the landfill. Since methane is lighter than air, it rises from the ground. Burning it keeps the landfill safe and is a great source of energy.

EMF is induced in a coil when it is rotated in magnetic field. The magnetic field is obtained in the space between N Pole and S Pole of a magnet. coil is kept on shaft and it is rotated. To take out the current from the coil, two slip rings made of brass are kept on the shaft. The slip rings are insulated from each other and from the shaft. Carbon brushes are placed on the slip ring. EMF is available across these brushes. Load is connected across the brushes.

This is called single phase type alternator or AC Generator. In practice three phase type alternator is used.

In alternator, used in power stations, armature is kept stationary and field is rotated.

in some cases we need a desired speed, like in cassette stereo system we need the proper speed so that we can listen the song in a proper manner so we need to control the speed of motor.

more example-lift,elevator

The rule of thumb for fusing the motor is 300% of the full load amps. To answer this question a voltage value for the motor is needed.

That would depend on the type of electricity used and the type of motor. The answer will be different for DC, single phase AC, two phase AC, and three phase.

There are many types of motors as well: split-phase, brush less, squirrel cage, synchronous, etc. Each one has different characteristics.

How the freaking heck should I know I ask you! Stupid site. Don't use it! Just go anyway!

The most common unit of energy in Biology is calories. A calorie is a unit of energy, require to raise 1 kilogram of water to 4.1868 joules.

electromagnetic? Yes, it is if the motor is electric...

Hafnium (Hf)

Atomic # 72

Atomic Mass 178.5

Protons 72

Electrons 72

Neutrons 106

Melting Point 2230 C

Boiling Point 4600 C

Normal Phase

It's A Solid Metal And Belongs Into The Transition Metals.

Since it the rate at which the flux is cutting the conductor determines the (EMF) electromotive force which is the voltage, the best way to control voltage is to adjust the speed of the engine through the governor, coupled with an automatic voltage regulator.

millivoltmeter has more ressistance.By ohm's law V=IR. if we assume that I is constant then V proportional to R as the millivoltmeter has more voltage as compared to micro-voltmeter , the milli voltmeter has greater resistance

Draw three phasors (vectors) at 120o with each other, with each the same length. Now, vectorially add those phasors graphically -you will see that they cancel.