Electrical Engineering

This seems like a question from an electrical course, and is probably best answered by your course materials. It's your test question, not ours, and there won't always be someone to ask the answer of. Earn your diploma.

Resistance load it means there is passive load to impede current flow. Inductive load means there is a coil as a load while still a passive it has its own characteristics which differs from a resistive load which is linear while inductive is not linear load

The only relevant number is the kw. Then you just divide by the power factor to get the KVA. 0.8 is a pretty typical PF, so that would give you a KVA of about 9.4. But motors can take up to 5 times their rated current on start-up, so you need to make sure you have a generator that will handle that instantaneous current.

Resistance of a conductor is defined by the specific resistivity, area of cross section and the length of the conductor. R = rL/A, where R is resistance in OHMs, r is specific resistance, L length in mm, A is area of cross section in sq mm

If you apply a DC voltage to an inductor (AC or DC, it does not matter) the current through the inductor will increase with a rate proportional to voltage and inversely proportional to inductance. di/dt = V/L In the ideal case, current would continue to rise to infinity. Since there are no ideal voltage sources, inductors, or conductors, current would rise to the limit of the voltage source's current capacity or to the voltage divided by the resistance of the circuit, whichever comes first. Note that an inductor is essentially a short circuit to a DC voltage. You need series resistance in order for the circuit to remain stable.

Because that is the accepted convention.

The triangle is the symbol for an amplifier, be it a differential amplifier with two inputs, such as an op-amp, or be it single ended, such as a simple transistor.

The triangle symbol is used to show a block diagram of something that might have multiple things inside it, which the op-amp does. It is not generally used to represent a simple transistor, unless you were showing a block diagram.

The triangle symbol is also used in digital logic diagrams, to indicate buffers (again, amplifiers), or inverters.

Kirchof's Law - the voltages are measured between the same starting-point and end-point.

You may get some sound out of the unit but not at the fidelity that the manufacturer designed the speaker to produce.

An induction motor relies on low-frequency currents induced in the rotor by the difference in speed between the rotor and the rotating magnetic field. At sychronous speed the induced current is zero therefore the torque is also zero.

There are several advantages of 3-phase power over single phase power. First, with 3-phase power, more power can be transferred with the same amount of wire (meaning the amount of copper used in all of the conductors transferring that power) as with single or 2-phase power. Also, power is transferred more "evenly" with 3-phase power because the "next peak" is closer than it is with single and 2-phase power. The 3-phase motors run more smoothly than those run on fewer phases. Also, there are motor design considerations (one being control of the direction of rotation) regarding the motor that make 3-phase power more attractive. Use the link to the Wikipedia article on 3-phase power and skim it. It isn't long and it is quite readable.

Three phase electricity, per watt delivered, is cheaper than single phase. This is because you can deliver the power to an electrical appliance over three "power lines" instead of one. For example, if you tried to operate a 5 hp ac electric motor on single phase it would require 3730 watts for continuous operation and quite a bit more for start up. A 12 gauge standard wire is only rated for 2700 watts. The more current that runs thru a wire the hotter it gets. The hotter it gets the more the resistance (ohms) goes up. Resistance in a wire is pure waste in terms of electrical cost since you are paying to convert electricity to heat. The same motor run on 12 gauge 3-phase wiring would only deliver 1243 watts per electric line to run the 5 hp motor. Also for motor use, three phase is much smoother and "torquier" than single phase since the power pulses to the field magnets is matched far better than in the single phase. For a visual on this see the website description below: = Wikipedia: Three-phase electric power =

Depends on the resistance of whatever you're trying to run the current through. This is given by P=(I^2)*R

Where P is the power in Watts, I is the current in Amps and R is the resistance in Ohms.

For more info go here:

http://en.wikipedia.org/wiki/Electric_power

ammeter

"mega-" = one million, so 1 megawatt = 1 000 000 watts. So 10 mW = 10 000 000 W.

An Ohmmeter is a device that is used for the measurement of Electrical Resistance.

An ideal Ohmmeter consists of an electronic circuit having a constant current [I] passing through a resistance [R] & another circuit that measures the voltage[V].

Thus from Ohm's Law

R= V/I.

Micrommeter(or) Microohmmeter : To measure Smaller Resistances.

Megohmeters (or) Megaohmeter (or) Megger : To measure Larger Resistances. e.g. Insulation Resistance of Electrical Cables.

Locked rotor amperage is the amperage the motor draws when the voltage is first applied to the motor and the rotor has not started to turn. This amperage is usually up to 300% of the motors running amperage. Once the rotor starts to turn the motor generates a back EMF (electro motive force) that opposes the high inrush current. This back EMF drives the amperage down until the motor gets up to its rated speed at which time the motor amperage will be at its run amperage.

The advantage is lower wire usage and lower power losses. 3-phase power has some other advantages such as 3-phase motors being superior in performance.

A bulk power system (BPS) is a large interconnected electrical system made up of generation and transmission facilities and their control systems. A BPS does not include facilities used in the local distribution of electric energy. If a bulk power system is disrupted, the effects are felt in more than one location. In the United States, bulk power systems are overseen by the North American Electric Reliability Corporation

whose resistance is zero.but it is practically not possible. there is something resistance present in the wire

When a current in a coil increases or decreases, there is a change in magnetic flux linking the coil,an e.m.f. is induced. This is called self induced e.m.f. and the process is called self induction.

23,000 gallons

Voltage (volts) is equal to the current (amps) times the resistance (ohms):

V = I*R

Thus, the current I = V/R = 12 V / 3 Ohm = 4 A.