Electrical Engineering

Inductor impedance is given by jwL, where w=2*pi*frequency. Therefore as the frequency increases the impedance of the inductor increases, causing a larger current flow and a larger power dissipation across the inductor

This from the "Induction motor" article in Wikipedia: "In principle, any AC electrical generator can be called an alternator." The only difference between an AC motor and an AC generator is whether one has electrical energy put in to get mechanical energy out, or whether one has mechanical energy put in to get electrical energy out. That means the answer to your question is basically, "There is no physical difference between an AC motor and an alternator." The unit in question can be used in either way, and assumes a name based on which way it is used.

My mobile phone (an Alcatel) charger will supply 500 mA at 5 V. So the maximum continuous power it is capable of supplying will be the product of these two -i.e. 2.5 W. Of course, it won't necessarily ever reach that value in practise.

Have a look at AuroraGenerators.com

If it is diesel your looking at about 1 gallon per hour however likely you are not running at full load. You can expect to be using on average 0.5 gallons per hour on an Aurora Diesel Generator

There's no such thing as a 'negative voltage' in the 'polarity' sense, only in the 'direction' sense. So what exactly are you asking?

Few electric motors have a heat related shutoff, or fuse.

If the motor's bearings overheat - usually through drying out because of no lubrication (grease or oil) - they will eventually seize up so that the motor is overloaded and draws too much current. In that condition the circuit protective device (circuit breaker or fuse) should act to stop supplying the motor with current.

***Original answer***

Many electric motors have an internal thermal shut-off to protect against overheating.

Overloading will cause a motor to overheat and shut off. Check the amp draw and the condition of the bearings.

Open end credit is when a borrower can continue to borrow and pay off in various amounts, such as a credit card.

Closed end is when the lender tells the borrower how much they can borrow and a fee schedule is set up which the borrower will pay until the debt is paid off, such as a car loan.

No. Motors can be run in either direction, clockwise or counter clockwise.

However, mechanically spinning an electric motor will generate electric power.

If you add another resistor or just increase the resistance the current will decrease. I think the statement you are talking about means that whatever the current is in the series circuit it will be the same everywhere in that circuit, on both sides of the resistance. The resistance lowers the current in the entire circuit, not just after the resistance.

The question you pose doesn't make a lot of sense. An RPM is a unit of rotation and an amp is unit of electrical current. You can't convert these units just willy-nilly. Now if you were wondering about the correlation of RPMs in an electrical dynamo and the current produced, that would make more sense... I'm just not sure what you're asking.

A transient voltage is a time varying voltage value. Transient says that the voltage value changes, especially from a steady state, to a new value, then back again.

yes ,they can be connected ,then they both will drive the current through that resistance ,the current through that resistance will be the sum of currents due to each individual source taking only one at a time (use superpositon theorem)

Voltage attempts to make a current flow, and current will flow if the circuit is complete. It is possible to have voltage without current, but current cannot flow without voltage. The answer is "yes",voltage remains the same as current moves through the circuit.As the voltage remains constant, current increases in the circuit.

The formula you are looking for is Watts/1000 x hours in the day x cost per kWh.so it is 1,500

When 60 hertz current is used, current flows in one direction for half a second. This is because for 60 Hz frequency, polarity changes 60 times in a second, meaning it flows in either direction for 500 Ms.

"Clem Motor"

It does not matter to the motor, just as long as the three phase voltage is what the motor specification requires.

HOWEVER..... While the motor will run in either star or delta, it will draw 3 times as much current in delta as it does in star, and will develop 3 times more torque (and power) in delta compared to star.

3 phase motors are often started in star, as it draws less current and is less likely to blow fuses, damage contacts and upset the supply system due to voltage drops. When the motor is near full speed, the motor is switched to delta connection for full power. This is called star-delta starting, and is suitable for light, low inertia loads such as fans or pumps. Because of the motor's reduced startup torque, it shouldn't be used for compressors, machines with heavy flywheels, or machines that come onto load before they reach full speed. Motors designed for star-delta starting will have 6 live terminals in their connection box.

Let's get a little bit technical. In star, each winding has L-N voltage across it (about 58% of the L-L voltage applied when in delta) - in Australia, our voltage from the active (live wire) to the neutral (return wire) is 230 volts, and the voltage from one active to another active is 400 volts. (230 / 400 is about 0.58, or 58%. and 400 / 230 is 1.73 or 173%). Connecting a motor in star puts 230 volts across each winding, and connects ONE winding to each supply phase. when running, it draws (say) 10 amps, and develops about 6 kW / 8HP. In delta, each winding has 400 volts across it, and each supply line powers 2 windings, so the current increases by 1.73 (400 volts compared to 230 volts) and again by 1.73 (2 windings on a 3 phase system draw 1.73 times more current than one winding.) 1.73 squared is 3 - so in delta, the motor draws 3 times more current (30 amps), and delivers 3 times more power (18kW / 24HP).

Some motors are designed to be operated ONLY in star - they may have a label advising you of this, or they may have only one value of voltage and current on the nameplate. They will also usually have only 3 terminals inside the connection box. If you suspect that the motor is 'star only', but want to make sure, connect the motor in delta, and check the running current as soon as the motor is up to speed; if it is drawing more than the nameplate current, or the motor is noisy in delta, but not in star, stop the motor immediately and reconnect it in star, or the motor WILL burn out very quickly.

mechanical,electrical engineering

The v in vdc stands for volts. The dc stands for direct current. This is a voltage that you find in batteries and is not to be confused with AC which is alternating current which is the electricity in the utility grid that feeds your home electricity.

They will not be very different.

KVA is the unit for the apparent power i.e it's the vector sum of the true power in KW and the reactive power in reactive volt-amperage. So, to get the value of the KVA for the 30KW,just divide the active power(30kw) with the power factor of that load.

You need to know the amperage requirement of the pump and then you can calculate the wire size.