Electrical Engineering

Well the purpose of the transformer in an amplifier is impedance matching. Lets say the transformer is on the input of a audio amp. Now the amp circuitry has an input impedance (this is important because matching the impedance gives us maximum power transferred from the input signal source to the amp circuit, and that increases performance) and a microphone has an output impedance. So if the microphone is 10,000 ohms and the amp circuit is 500 ohms then the transformer is designed to transform 10,000 ohms to 500 ohms for better signal transfer. If the trans former is on the output of an amplifier the trans former transforms the output impedance of the of the power amp circuit to the input impedance of the load. If the output is a speaker (usually 8 ohms ) and the output impedance of the amp circuit is 1000 ohms then for maximum power transfer the transformer trans forms 1000 ohms to 8 ohms. This was the case using electron tubes. Now with transistors, amplifier circuits can be built with lower output impedances (common collector circuit in a class B power amp) so the costly transformer can be eliminated. Also Audio transformers are made slightly different in design than power transformers. Ausio transformers are designed with higher resistance in the windings to enable a wider frequency response where as power transformers are designed with much lower resistance to keep heating minimized while passing only one power frequency (60 hertz) at large amounts of power. Roger nsc@psu.edu

Fuses blow, in any application, when the current in the circuit exceeds the limit preset by the fuse selection. It is also possible, if the fuse terminals are corroded, for heat to be generated, causing the fuse to melt, giving the appearance of having blown.

There are several types of censors:

1 Acoustic, sound, vibration

2 Automotive, transportation

3 Chemical

4 Electric current, electric potential, magnetic, radio

5 Environment, weather

6 Flow

7 Ionising radiation, subatomic particles

8 Navigation instruments

9 Position, angle, displacement, distance, speed, acceleration

10 Optical, light, imaging

11 Pressure, force, density, level

12 Thermal, heat, temperature

13 Proximity, presence

Designed for industrial facilities, these fully shielded and insulated plug-in terminations connect underground cables to transformers, switchgears and junctions with load-break bushings.

* 3 phase motors * resistance heaters

Much higher.

Very unlikely. Its 3 phase for a reason, it needs a large voltage/current to power it, single phase won't provide that.

The question is moot, here's why: First of all, the replacement must supply the correct voltage. This cannot change. You always replace a 12V supply with a 12V supply. If the replacement supply has the correct amperage, it will also have the correct volt-amperes, since (by our definition) the voltage is the same. Say the old supply was 12V, 2A. This is a 24VA supply (12 X 2 = 24). The new supply also must be 12V, so which is more important, amperes, or VA? As you can see, if we make sure the new supply is 2A, it will also mean it supplies 24VA (12 X 2 = 24). If we make sure the new supply is 24 VA it will obviously supply 2A (24/12 = 2). So, assuming the voltage stays the same, matching either VA or amperes automatically means the other value is correct.

It's where electronics begin. You cannot have any electronic device without having a chip inside it, and without the heroes of this industry we would be far behind where we are in the digital world of today.

At 1200 kWh per month, you are using an average of 1600 watts. A 600 watt wind generator might seem to be a good buy, because it could supply one third of your energy.

You do have to consider total cost, including maintenance, and the storage and conversion system that would be needed to capture the wind energy when you are not actually using that amount of load.

You then estimate the potential savings. 1200 kWh, depending on your local electric rates, may be around $200US. Saving one third of that might take a long time to recoup the cost of the generator installation.

To auto synchronize an alternator with grid, consider the manual method first... 1. Adjust RPM so that frequency is slightly higher than the grid
2. Adjust excitation current so that voltage is slightly higher than the grid
3. Just before phase angle of zero is encountered, close the breaker
4. Immediately adjust input power (close steam bypass valves) and adjust excitation current to achieve desired watts and vars
5. Monitor and trim as needed So, to do this automatically, build a controller that does this. A computer, perhaps?

which year was the circuit breaker invented? was it year 1924 or year 1925?

Pelton wheel could be used to lift water from a lower source (lake or something) to pour into a high place. Another use, it could be used to dig into the earth, the wheel have the shape of a milling cutter, it can open channels in the ground or something. It could also be used to measure the speed of a fluid, if connected to a dynamo meter, the speed of flow could be read via voltage. These are some applications.

BY:

FAISAL RAFIQUE

Doubling the voltage in a circuit does not double the propagation speed in that circuit. It only doubles the available energy (volts is joules per coulomb), which doubles the current (amperes is coulombs per second), and quadruples the power (watts is joules per second).

Well for one, it would be a dry cell without it... But to explain the other side, it is the chemical reaction that causes the electricity to flow. There is quite a bit out there on what happens at an actomic, level, and how the electron flows as part of the chemical reaction.

The largest 120V motor generally available is 3hp. A 3hp, 120V motor draws about 30 amperes. All true 5hp motors I have seen are 230V or higher.

Note that some motors, such as compressors and vacuum cleaners, use artificially high hp numbers to entice you to buy their unit (they will use terms like peak-developed hp, etc.). These ratings are not true hp, and you just have to go by the nameplate rating on the unit.

For instance, I have a Sanborn Air Compressor that claims 4 PEAK horsepower, yet only draws 17 amperes at 120V. Its really closer to a 2hp motor.

Most likely a defective phase winding in the motor or even a missing phase in your power input.

transformer consists of polychlorinated biphenyls,...etc

1.Due to the heat and environment conditions.

2.proper protection not provided.

3.loose connections.

4.short circuit.etc...

Prevention.cooling the capacitor

proper maintenance and take care.

The rating of 450 amp-hours in a battery bank means that the battery can supply 450 amperes for one hour, so to speak. In reality, these ratings are normalized to an eight hour rate, which means that this battery can supply about 56 amperes for eight hours. Actual run time at 450 amperes would be somewhat less than an hour.

A Cathode Ray Tube is a specially constructed vacuum tube in which an electron beam controlled by electric or magnetic fields generates a visual display of input electrical signals on a fluorscent screen. It consists of three important parts, namely, an electron gun, a deflection system and a fluorscent screen.

Higher than normal demand will cause more electrons to flow through the load. This will cause the amperage to increase, thereby causing power to increase. A lightning strike on the primary line will cause this condition.

An ammeter is a amp meter put into a circuit in series. There is virtually no voltage drop or resistance in an ammeter so two in series would be redundant. If you have one in a circuit it will tell you the amps that circuit is generating, two would both give virtually the same result.