Electrical Engineering

The bulb will shine as long as it is still part of a complete circuit. You probably have a diagram for such a circuit. See if you can still trace a path through the battery and one of the bulbs without passing through the other bulb. For comparison, try the same thing with a diagram of a series circuit.

ac is used as it can travel farther in most conditions losing less energy making it more

efficient to travel to different houses, although most high power appliances like computers convert dc because it is more condensed energy

1500

oppen circuit

That means that there´s a switch which protects the motor of overheating. For instance if on the nameplates is a marking: IsoKl. F it means that the motor is protected up to 155°C. There´s a Thermoswitch on every phase (3) to protect the insulation. The two cables are a little bit thinner than the others.

the ugly"s book is a good reference.from the contactor /overload relay you need 3 wires and L1 is always your STOP.need a jumper wire which is always the lowest number on your contactor. on a siemens that would be #2. different manufactors have different numbers,your start would be #3 on a siemens contactor or the terminal on the left side of L1. jumper is needed to bring the power to your stop/start. hope this helps!! always consult the experts if not sure. start is no,stop is nc jumper is auxilary contact

No, commutator motors as used in vaccum cleaners for example do not use a starting winding. Single-phase induction motors need a starting winding without which they will start in either direction if given an initial twist.

Yes, of course.

A single-phase load is connected between any two lines of a three-phase, three-wire, system, or between any two lines or between any one line and the neutral of a three-phase, four-wire, system. It's important, of course, that the resulting voltage matches the requirements of the load.

You can't in any simple way. You must have three phase electrical supply from the local power company to install a three phase panel and employ three phase power. Virtually all residences in the U.S. have single phase power supply only. (Even if you have 220/240 V service that's still single phase.) The primary advantage to three phase power is it's ability to run electric motors more efficiently and provide them a longer life. That's why it's only supplied to commercial properties. If you need three phase power from a single phase panel then that can be done. It is said money can make anything happen. Depending on the amount of money you want to spend to make this happen there is a device on the market called a VFD ( Variable Frequency Drive). On the three phase input terminals you apply your single phase voltage. On the output terminals you connect your three phase motor. When run in this configuration there is an internal switch that has to be changed to let the VFD know that it should be looking for only two lines on the input to be hot. Other wise the VFD thinks that there is a line loss on the three phase input terminals and the unit will not start.

Next time on the roads, don't scoff at the speed-breakers. They could actually light up small villages off the highway.

An amateur innovator in Guwahati has developed a simple contraption that can generate power when a vehicle passes over a speed breaker. Kanak Gogoi, a small time businessman, has developed a mechanism to generate power by converting the potential energy generated by a vehicle going up on a speed breaker into kinetic energy. The innovation has caught the eye of the Indian Institute of Technology (iit), Guwahati, which will fund a pilot project to generate electricity from speed-breakers.

The idea is basic physics. Gogoi has welded five-metre-long metal plates into the speed-breaker instead of the conventional bitumen-and-stone-chip rumble strip. The plates are movable and inclined with the help of a spring-loaded hydraulic system. The fulcrum-attached plates are pushed down when a vehicle moves over them and bounce back to original position as it passes.

"When the vehicle moves over the inclined plates, it gains height resulting in increase in potential energy, which is wasted in a conventional rumble strip," Gogoi says. "When the plates come down, they crank a lever fitted to a ratchet-wheel type mechanism. This in turn rotates a geared shaft loaded with recoil springs. The output of this shaft is coupled to a dynamo to convert kinetic energy into electricity," he explains.

iit Guwahati has evaluated the machine and recommended it to the Assam ministry of power for large scale funding. A K Das, a professor at iit's design department says it is a 'very viable proposition' to harness thousands of mega watts of electricity untapped across the country every day.

"A vehicle weighing 1,000 kg going up a height of 10 cm on such a rumble strip produces approximately 0.98 kilowatt power. So one such speed-breaker on a busy highway, where about 100 vehicles pass every minute, about one kilo watt of electricity can be produced every single minute. The figure will be huge at the end of the day," he said.

The Assam power ministry is expected to back the iit pilot project.

Das says a storage module like an inverter will have to be fitted to each such rumble strip to store this electricity. The cost of electricity generation and storage per mega watt from speed-breakers will be nearly Rs 1 crore as opposed to about Rs 8 crore in thermal or hydro power stations

If you add a second resistor, the resistance of series circuit will increase.

a diode in the exciter has blown or leaking current back and forth, test diodes with a multi meter continuity test.

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It sounds like the field excitation voltage has been lost. Check that the field potentiometer has not been turned down to the off position. Check at the F1 and F2 outputs of the voltage regulator for any DC voltage.

You connect a galvanometer in series with the circuit being measured, because the galvanometer is a form of ammeter, although an extremely sensitive one, and ammeters measure the current in a series circuit.

The wire size and the circuit breaker for a 125 hp motor must consider the length of lead wire to the motor (essentially the distance of the motor from the supply).

125 hp is a VERY large motor and would be used only in industrial applications. You will need to consult a technician for proper advice, but the general answer to your question follows:

The current draw on such a large motor would be approximately 300 amps. That is very large, and would require a wire size of 0000 AWG or 750M. 0000 AWG is 0.46 inches (11.68 mm) in diameter. As you can see, the wire is very large. It is not something you could install yourself.

negative - on battaery 1 goes to ground positive + on battery 1 goes to negative - on battery 2 positive + on battery 2 goes to your power requirment can be done in any case senario e.g 2-6volts to get one 12 and 1-12 24 or 4-6volts 12-volts 4 12volts any case senario negative - on battaery 1 goes to ground positive + on battery 1 goes to negative - on battery 2 positive + on battery 2 goes to your power requirment can be done in any case senario e.g 2-6volts to get one 12 and 1-12 24 or 4-6volts 12-volts 4 12volts any case senario

In a INTERNAL COMBUSTION ENGINE,fuel is MIXED and METERED in the device CARBURETTOR.for usual normal running,its almost need a 16 fuel, to 100 air,by value,but in cold starting it need a 20, 22 fuel to 100 air by volume.more exactly, we need more fuel to a particular air volume for cold starting while mixing within the CARBURETTOR.but as engine warms up,its no need to feed RICH mixture, in to combustion chamber, so to accomplish this, we use two independent CHANNELS,to feed the fuel in to the engine.first and basic one is VENTURI DRAUGHT, is fuel is entered in to combustion chamber, because of the suction of the reciprocating PISTON.but to cold start,it employs a second channel, is CHOKE.when we operate CHOKE, an additional line is opened temporarily,thus feeds the engine more rich fuel mixture.it acts until you releases the actuating lever.when engine reaches its normal operating temperature you must release the CHOKE, if not, it will run with more fuel, and can damage all engine parts , inc spark plugs, crown of the piston, piston rings , crank bearings etc...and the FRONT BRAKE in a two wheeler is far important, as the front wheel provides more than 60% OF TOTAL STOPING POWER !!!!...so USE BOTH BRAKES SIMULTANEOUSLY..because,while we braking the entire force is shifted towards the front of the bike, in relation with NEWTON'S LAW OF MOTION..SO YOU MUST USE GOOD TYRES AT FRONT SIDE THAN REAR....a PRO ARM also increases the stability of a bike while braking....

750 watts per horse power

20 x 750 = 15,000 watts / 220V = 68A

68 amps at 220 volts

The change over time will vary with the type of motor, size of motor and the connected load to the motor. The time should be adjusted so that the motor is up to speed and stabilized at the star speed. It is at this point that the change to delta should take place. One thing to note is, do not leave the motor running is the star position any longer that it needs to.

A polarized plug allows connection in only one direction. This ensures that electrical components with a higher risk of user contact, such as the shell of a lamp socket, as opposed to the center pin, is connected to neutral, and thus not presenting an electrocution hazard.

A phase converter converts single-phase, alternating current power to three-phase power. There are two general types, static converters and rotary phase converters. A basic form of rotary phase converter is a single-phase electrical motor with its shaft coupled to a three-phase alternator.

A static phase converter converts single-phase power to three-phase power by using electronic switching. They typically convert the single-phase, alternating current to direct current and then electronically synthesize three phase power output for use with three-phase equipment.

A reverse current relay senses Power in (uses both voltage and current, and looks at the phase angle between these), and operates if power is flowing in the reverse direction, and the current is above a set point. An overcurrent relay looks at only current, and operates if it is above a set point regardless of power flow direction. Reverse current relays are often referred to as reverse power relays.

No

A synchronous motor is not self starting.However when it is provided with some prime mover ,which rotates it up to 80% of sync. speed,then it continues to rotate at sync.speed even after prime mover is removed.It happens so because rotor poles are locked with rotating magnetic field and hence the speed is always synchronous.