Electrical Engineering

Yes the circuit needs to have no breaks or have the switch open to let the electrons pass through.

1st is in a.c there is frequency say 50 hz in d.c. it is zero means a.c. produces 50 cycles per second . n d.c. is steady current. 2nd is in a.c inductance comes into picture. but when it is d.c. inductance is zero. 3rd is in a.c skin effect is there. due to this its resistance is high in a.c. as compared to when d.c. current is flowing. 4th is in a.c ,we can quench the arc when fault occurs very easily rather then d.c. current. 5th and major difference is that when we have a.c. quantity we are able to step up or step down the voltages but in d.c. its not possible to get. i hope everybody can understand. bye.

An LED is a diode that emits light; diodes allow current to flow only one direction. The voltage applied to the diode attempts to force current to flow in a specific direction. If the voltage polarity is reversed, and current was flowing before (so there was a small voltage drop across the diode), current will cease to flow (assuming the voltage is not too high for the diode to handle), and (almost) all the voltage will be dropped across the diode (a small leakage current may flow, which means some of the voltage will not be dropped across the diode, but this is in the milli or micro range).

I would never define a diode as a "voltage controller" or "current controller". It could be either or both, from the above description.

This type of circuit is called a series circuit. Each bulb becomes a part of the circuit and if one burns out or is removed the circuit is open and electricity no longer flows through it.

If you draw a circle and mark an 'x' on its rim and call that the power source. The electricity flows out and through each light and back to the source. If you erase a part of the circle, to represent a blown bulb, the circuit is broken and the electricity does not flow.

Some examples of single-phase motors include split-phase, capacitor-start, shaded pole, and permanent split capacitor (PSC) motors. Each type has its own unique design and application, offering different characteristics and performance capabilities.

No, a voltmeter measures voltage in a circuit but cannot increase it. It is a passive device that is simply used to read the voltage at a specific point in the circuit.

You can install a 220V single-phase transformer to step down the 440V three-phase supply to a 220V single-phase output. Connect the transformer's primary winding to the 440V three-phase source using the three poles and four wires. Then, connect the secondary winding to your 220V single-phase load using the two poles and three wires. Make sure to follow local electrical codes and regulations when performing this setup.

In three phase:

I = (three phase VA) / (sqrt(3) x (phase to phase voltage))

for single phase:

I = (single phase VA) / ((phase to neutral voltage))

keep in mine three phase VA = 3 x (single phase VA),

and phase to phase voltage = 1.732 x (phase to neutral voltage)

Therefore the single phase and three phase currents are the same (ie, the three phase currents are the same in all three phases, or balanced).

But don't get available current and available power confused (KVA is not the same as KW).

4.7mA * 1/1000mA

The mA cancel and then divide the 4.7 by 1000.

voila 4.7mA = .0047A

In the Bahamas they use 120/240 and 120/208 voltage at 60 Hertz.

Ground can be a confusing term, as it can have two separate meanings.

Here's one way: Conventionally, the ground of a circuit is the return line for the current. If you have a battery hooked up to a resistor, then the "positive" side of the battery terminal, the side that carries positive voltage, is the "hot" side, and the other side that completes the circuit back to the negative terminal of the batter is "ground." That said, ground is technically anywhere in the circuit you want it to be. Ground is what the designer of the circuit decides is 0 volts, and every other voltage is relative to ground.

Another use for the term "ground" is the safety measure built into our electrical system, now. It's a short circuit to the Earth so that if something in your circuit breaks down, the extra, potentially dangerous current, can flow directly to the Earth, and not build up dangerous charges in the machine, etc. The bottom hole of your wall outlets is this safety ground.

But, to restate what I said above: In terms of the circuit, ground is technically what you define to be 0 volts.

To construct a working simple circuit, you will need a power source (such as a battery), a load (such as a light bulb or a motor), conductive pathways (wires) for the electricity to flow, and a switch to control the flow of electricity.

A neutral wire is essential in a three-phase star (or wye) connected system supplying an unbalanced three-phase load. Without a neutral, the voltage across each of the loads may become unbalanced, too.

23 volts across 470 ohms will dissipate about 1.1 watts.

Power equals voltage squared divided by resistance.

You do not need ohm's law to relate power to current and voltage. Power is current times voltage. If you know current and voltage, you do not need to know resistance.

The formula to calculate the rotor speed (N_r) of a cage rotor induction motor is given by: N_r = (120 * f) / P, where f is the supply frequency in Hz and P is the number of poles in the motor. This formula assumes the motor is running at near synchronous speed and neglects slip.

The main advantage offered by an HRC fuse is that, when a fault current condition occurs, a tremendous amount of heat is created within the fuse. That heat melts the silica sand filling of the fuse into glass. Glass, being an insulator, suppresses any arc-over and breaks the circuit instantaneously. This behavior minimizes the possibility of a continuing - and dangerous - "high arc current" situation from developing, which is what happens if a normal fuse fails to break a heavy fault current.

Compared to normal, "non-HRC" fuses, the main disadvantage of using an HRC fuse is that they cost a lot more to make - and to buy - because of the extra materials they contain. But choosing to use an HRC fuse instead of a normal fuse makes very good sense if the equipment that needs to be protected - or other equipment nearby - would be very expensive to replace if it all went up in smoke just because of a fuse which was not capable of stopping a high fault current flowing.

So, if some expensive electrical equipment was supplied with one or more HRC fuses installed to protect it, you would be very foolish indeed to replace them with normal "non-HRC" fuses.

Having more electrons typically means that the current will be higher, as current is the flow of electrons. Voltage, on the other hand, is a measure of the electric potential difference between two points and is not directly related to the number of electrons present.

Having 180 volts on a phase in a house could indicate an issue with the electrical system, such as a loose connection, faulty wiring, or a problem with the transformer. It is important to have a licensed electrician inspect and resolve the problem to prevent any safety hazards or damage to appliances.

Unbalance. Large amounts of unbalanced current can cause negative sequence and ground relays to operate. There are many problems that result from "too much" unbalance. Understand that no system is perfectly balanced, though.

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If the load is balanced there will be no current flowing in the neutral. For that reason a neutral wire is sometimes not connected to a balanced three phase load. An unbalanced load will cause neutral current to flow, if a neutral is connected.

due to unbalanced load ,some current will flow through the neutral wire.hence due to I^2R losses voltage drop will occur in neutral.so the voltage regulation will decrease.

To calculate the voltage across a 600-ohm resistor, you also need to know the current passing through it. Using Ohm's Law (V = I * R), where V is the voltage, I is the current, and R is the resistance, you can determine the voltage.