Electrical Engineering

240 volts alternating current (240vac)

Yes. Actually they should be run in the same conduit. You don't ever want to run parallel separately.

When you close an inductive circuit, since an inductor resists a change in current, the initial reaction of the load is to look like a high resistance. As current builds, the resistance falls. With a theoretical source and inductor, current would eventually reach infinity, that is after infinite time, but practical sources and inductors will reach a plateau current.

When you open an inductive circuit, again, since an inductor resists a change in current, the inductor attempts to maintain that current, but there is no conductivity for that current so, the inductor presents a high voltage spike in the reverse direction it was initially "charged" with. With a theoretical inductor, and theoretical infinite impedance, the voltage spike would be infinite. Again, practical inductors have a maximum voltage spike, but this spike can still be quite high, even thousands of volts, which can damage the circuit, so it is important to maintain a conduction path for the collapsing field, often a diode, or a resistor/capacitor filter.

Voltage Grade of cables specifies the safe voltages which the insulation of the cable can withstand.

absent

fixed value, stepped or tapped, variable

Internal resistance is approximately equal to 94.667

This can be calculate quite simply using the following steps.

First calculate the power loss (as heat energy) from the iron using the relationship:

P= I2R, P is power in Watts,

I is current in Amps,

R is resistance in Ohms.

In this case P = 102 x 10

= 1000 W

Next convert 4 hours into the standard time unit, seconds.

4 hours = 60 seconds per minute * 60 minutes per hour * 4 hours

= 14400s

Finally calculate how much heat energy is produced during this time using the relationship:

E = Pt, P is power in Watts,

E is energy in Joules,

t is time in seconds.

In this case E = 1000 x 14400

= 14400000 J

Or more appropriately 14.4 MJ (megajoules).

Hope this helps,

Tom

Yes, North American Breaker is the market leader in providing new material for all industrial, commercial, and residential applications.

2003 Ohms.

R = (R1 x R2)/( R1 + R2)

Where R = 667 and R1 = 1000 then R2 = 2003

this is called time period of the wave. it is also the inverse of frequency of wave.

residential wiring are called single phase because the 2 phases coming in are one is neutral and the other is line.the neutral has a potential zero with ground and it is to provide a closed path for the current to flow through..the line is having a potential of 230V with the ground and a line together with a neutral is called a phase

You are posing a question from a textbook or similar, but you don't give all the info about the configuration or starting condition

Too much load for the generator, the generator began to under speed / overspeed, the governor / part of the generator went into failure, the generator capability was not up to the requirements placed by the system (needing to push out/pull in too many VARs), etc.

there are many reasons for a generator to drop a load. Because a load dropped, this does not infer that the generator was the cause either (fault on the system, system instability limits reached, system protection tripped - non-generator related protection).

Conversion of electrical energy into mechanical energy

A parallel circuit is used when the current through several components needs to be independent of each other. The simplest example is that of lights in a home. The lights with their switches are wired in parallel. Turning on one light does not affect any others and similarly, turning a light off does not turn off any others. Each light is supplied with the same voltage which does not change even if other lights are turned on or off.

A series circuit is one where the current flows through one component and then through a second component and so on. If the current flow through one component is changed, it is also changed in all the others in the series circuit. A string of Christmas lights is a good example. Removing one bulb from the string of lights will stop all the others operating because there is no current flowing through any of them.

A grounded neutral will be at earth potential. A floating neutral will be at a voltage dependent upon the voltage imbalance between phases, and the design of the transformer.

You have to follow the lines. Could be blown fuse or any number of other things. Follow it back to the service.

it depands on switching overvoltage or lightening overvoltage.

The best way to charge a battery from an AC source is to use a high-quality commercial battery charger that is of the correct voltage and charging profile for your battery. By "charging profile," I mean a charger that is matched to the battery's chemistry and amp-hour capacity. WARNING: Not every type of battery is rechargeable, and even rechargeable batteries can do nasty things if they are not charged properly. If you are not sure you have the right charger, please ask someone for help.

If you want to make your own charger, the answer to "how" depends upon the AC source, the kind of battery, and how "good" a charger you want to make.

At a minimum, you need some kind of rectification of your AC power. Your battery will tend to discharge during the part of the cycle where it is not reverse-biased, so you will need something like a diode to make sure the battery can't drain itself back into the charging circuit. Cheap chargers for car batteries, for example, are sometimes nothing more than a transformer (to convert the mains voltage down to something suitable for the battery) and a rectifier (two or four diodes).

More sophisticated charger circuits are used to maximize battery life (heat from recharging can damage batteries, so charging circuits use various strategies to control the heat) and to provide the appropriate charging profile for the battery chemistry. You'll see a pretty dramatic shortening of the life of your batteries if you don't use a specialized circuit to charge some kinds of batteries. For this reason, you may want to use a commercial charger. If you really want to build a charger, try to get a kit or build from a known-good circuit.

the electric fusible disconnect EDF switches

Yes, the more voltage you put in the more you get out. If the transformer is a 2 - 1 ratio and you put 240 in you get 120 out and when you put 480 in you get 240 out. Magnetic field strength and voltage have a direct relationship.

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The field strength is actually a function of current, although as you say, increasing the voltage will increase the current hence the magnetic field.

it is usually provided by a battery or generator.