Electrical Engineering

In a series circuit, resistances can be added directly whereas if they were wired in paralell you would add their inductances denoted by G instead of R and then take the reciprocal 1/Gtotal to find equivalent resistance. G = 1/R.

Series Ex.

23 ohms + 5 ohms = 28 ohms. and due to Ohms law V (volts) = I (amps) * R (ohms)

so I = V/R = 44/28 = 1.57 amps

Paralell ex.

Rtotal = 1/((1/23)+(1/5)) = 1/(.0435+.2) = 1/.2435 =4.1 ohms

therefore=> I = V/R = 44/4.1 = 10.7 amps.

Note this is the total current drawn from the power supply. In reality each resistor draws its portion of current where the lower resistance draws higher current and vice versa.

500 miles long

A parallel circuit will not effect the other bulb. If the bulbs are in a series circuit the other bulb will not turn on.

The voltage is gained by multiplying the current and resistance together, i.e.. 50 x 500 = 25000

Imagine the three as a triangle with the voltage at the top, and the current and resistance at the bottom-

V

.

----

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I x R

The voltage divided by the current is the resistance and the voltage divided by the resistance is the current. Therefore the current times the resistance is equal to the voltage. Having any two of these figures allows you to find the third.

The simplest form of control of an electric motor is a switch. In most applications a motor may be allowed to run continuously for lengthy periods, for example, in a fan. However, if a motor is being used to power a crane or to lift a large door it must be made to shut off when the object it is moving reaches a limiting point, whether or not a human operator notices that the limit has been reached. Shutting off an electric motor under this type of condition is the function of a limit switch.

In many cases the object being moved makes more or less direct contact with the switch or it does so via some form of lever. However, there are cases where the object might be moving either too fast or too slow to properly operate a switch. In these cases a geared limit switch will be used. The gears in the switch transform the movement of the object being moved to match the needs of the switch. I have mentioned speed of movement. There are other possibilities too. It might be necessary to convert rotational movement to up-and-down movement to control the switch, or various other kinds of movement. Clearly the exact nature of the gears inside the limit switch will vary depending on the transformation required.

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The master is a more precise frequency source which other less precise oscillators in a system can synchronize with.

Modern terminology replaces Master/Slave with Primary/Secondary, same function.

P/S relationships are most visible in today's radio clocks which sync with WWV time standard by radio signals when they can, but can maintain acceptable accuracy, usually during the day when there is no skywave activity.

In the LORAN system there is a similar P/S relationship where all the secondaries sync their oscillators with Primary, and can run with acceptable accuracy when they lose Primary for short periods of time.

Likewise GPS recievers have oscillators which sync with the satelites which sync with ground stations.

On a three phase system you have incorporated into it a potential of three single phase systems. A-B, B-C, C-A. Any two legs of a three phase system can be used as a single phase load. On a three phase system, be it a motor or a service, if one of the legs drops out for what ever reason, the remaining two legs are known as single phase. This is how the terminology became single phasing. As a side note a motor will run in a single phase condition, it just will not start. In motor control, a single phase condition is prevented by the use of overload heaters on all three voltage legs.

A generator, alternator, or dynamo is a (usually)rotating machine that converts mechanical energy into electrical energy.

This is the principle behind electrical generation with the windmill, hydroelectric generator, crank generator. Ocean wave generators take advantage of the vertical motion of rising and falling water to achieve the same effect.

The speed of an induction motor depend on the frequency of the supply voltage 60Hz in the USA and 50Hz in most other country's and the speed can only be controlled by varying the frequency, the way to do it is to rectify the AC to DC and convert it back to AC but with another frequency. I'm planing to post a project on my website soon, so look out for it at http://www.patenttrade.net

central america

The transformer should provide 144-0-144 v to have a no-load voltage of 500 v dc in a voltage-doubler using two diodes.

You need a divider that is 10 to 1. You could use 10 megohms in the feedback and 1 megohm in the bottom leg. Since you are probably talking about an operational amplifier, you need this in both legs.

In a very simple, laboratory-type, a.c. generator -yes. In practical generators, the output (armature) windings are part of the stator, so do not rotate and, so, don't require slip rings.

This depends on the source. If you're using a function generator, it will be whatever the function generator is rated for. For AC power transmission, some countries operate at 50Hz, and some at 60Hz. The actual range that is allowable may be 1-2 Hz above or below the generally operated frequency. Some power plants may be very limitted so they have tripping points at say 59 and 61Hz; others may have a larger range. This is strongly dependent on the type of power plant, and the design.

No it will not run

Convolution is particularly useful in signal analysis. See related link.

The formula you are looking for is E = W/I.

You probably have one in your computer - any spinning disk uses a motor to spin (hard drives, DVD/CD drives, Floppy drives, etc.).

If you have a phone that has that can vibrate, it has a small motor (the motor's rotor, or the center part that spins, has a small weight on it that is off-center - this is what causes the vibrations).

Most fans are electric motors (air conditioning/heating fan in your car, etc.).

The answer is that it depends upon the

a. efficiency (to determine its input power).

b. supply voltage.

c. nature of the supply (single-phase, three-phase, d.c., etc.)

The answer depends on whether the cross sectional radius/diameter are doubles or the cross sectional area is doubled.

A midget with a black belt in karate. ANT - CAN CARRY LOAD 50X ITS WEIGHT BUT ELEPHANT CANNOT CARRY EQUIVALENT ITS WEIGHT

A leaky capacitor will act like a load therefore decreasing the DC and increasing ripple eventually the capacitor it will self destruct because of heating probaly taking out the rectifiers as well.