Electrical Engineering

The most typical three-phase voltage used in China is 380 V.

Motion of a fluid (liquid or gas) caused by density changes caused by temperature changes.

No longer than 46 feet. Longer than that switch to #12 on a 20 amp breaker.

When the number of rotor and stator poles are equal in the motor and if these rotor poles have opposite polarity with respect to the stator poles magnetic locking occurs.

This magnetic locking is know as "Cogging" in 3 phase squirrel cage induction motor.

In order to avoid this problem, the rotor slots housing the conductors are skewed by an angle of 5 degrees over the surface.

One horsepower = 746 watts or .746kW. Run the motor for an hour and this will equal .746 kWh.

Because copper is a very good conductor of electricity. Most other metals aren't as good, and would cause more resistance, resulting in the bus bar heating up.

Most simple incandescent light bulbs are made of a thin section of tungsten through which the current flows.

This section of tungsten is called a "filament".

The tungsten filament has electrical resistance and so is a resistor.

As a resistor it develops a voltage drop. This voltage drop multiplied by the amperage passing through it equals the wattage of the bulb.

The heated tungsten gets to thousands of degrees above room temperature and becomes hot enough to produce yellow-white visible light.

As a resistor, the tungsten light bulb has a positive resistance coefficient.

This means that the electrical resistance goes up when the filament becomes hot.

For example, a 100 watt light bulb operated at 120 volts - it does not matter if it is AC or DC for this calculation - will have a resistance of 144 ohms when hot and draw .833 ampere.

When cold the filament typically has a resistance of only 10 ohms which increases as the filament heats up.

Yes, there a difference between three phase and single phase electrical supply services.

Amps ain't nothing really until you cut on a light switch in your house. It's a term of electricity measurement of which is being used in a circuit. Say you have an unlit 50 watt light bulb in your den plugged into the 110 volt outlet. The 110 volts is there ready to operate the lamp. Cut it on and the electron flow is called current. Replace the bulb with a 100 watt bulb and the current flow will double. Cut off all the lights and the power meter on your house will run slower and you use less current and will have a lower electric bill next month.

Effective resistance in electrical circuits is determined by the arrangement of components and their resistance values. Key factors include the total resistance in series (sum of individual resistances) and parallel (inverse of the sum of the inverses of individual resistances). Additionally, posture constants such as temperature can influence resistance, as most materials have a temperature coefficient that affects their resistivity. Understanding these principles allows for accurate predictions of current flow and voltage drop in circuits.

It is not the "opposite" but the major alternative to parallel, which is a series circuit. In parallel circuits, each component has its own circuit path (input to output), while in series the components are connected to one another in a line.

Dc shunt motor is a constant flux and constant speed motor . So that it is used in centrifugal pumps ,machine tools ,blowers and fans etc.

415V 3 phase is the line to line voltage. The line to neutral of this supply is 230V single phase. Therefore you use one of the phases and the neutral.

3-phase is used to transmit power over distance because less wire is needed for a given amount of power. 3-phase induction motors produce a steady torque and don't need a starting coil to make them start rotating the right way.

how much energy is lost in converting dc energy to ac energy

A horsepower is equal to 746 watts, so 10 x 746 = 7,460 watts.

in a series RC circuit phase angle is directly proportional to the capacitance

Dangerous occurrences are those conditions or actions which have the potential to cause hazardous malfunctions. Hazardous malfunctions are failures of objects or assemblies which potentially may cause injury to operators or bystanders.

I assume your question relates to the need for a disconnect switch. To meet code you need a disconnect switch in the proximity of the motor so that should the need arise the motor can be disconnected for safe maintenance or in an emergency. The motor will work directly connected, but you will create a safety issue.

There is only two test you can do measure on the Ohm scale the resistance at the power connection if there is a reading then it means it's not open but that's not an indication that the motor is Ok, then measure on the MOhm scale between the body of the motor and any of the power connections if there is a reading then the motor have a internal short, the best is to open the motor and inspect it for black spots on the coils your nose is the best test smell it

The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave or triangle wave.

If the input is a square wave, the output is DC.

If the input is a sawtooth wave, the output is a triangle wave of the same frequency.

Induction motor is nothing but rotating transformer it works on principle of mutual induction , mainly induction motor consists of rotor and stator,stator is excited by three phase supply and rotor is shorted through resistances and slip rings. When ever stator is excited by three phase supply a rotating magnetic field running at synchronous speed is produced which in turn cuts the rotor winding causes flowing of current results in production of magnetic fields in rotor which having less than synchronous speed (slip speed), then the interaction of these stator and rotor magnetic fields produces a twisting moment in the rotor called synchronous speed

no idea at all....

Otherwise you'd have known it by now !!!

Sorry.

It depends on how the capacitor is connected and whether the supply voltage is a.c. or d.c. Assuming you are talking about a power-factor improvement capacitor (connected in parallel with an inductive load, supplied with a.c.), then the supply current will reduce.