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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
Why does the resistance in a series resonant circuit have no bearing on the resonant frequency?
Series resonance occurs when a circuit's inductive reactance is equal to its capacitive reactance. The resistance of the circuit is irrelevant.WebRep
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Generically, it's an 'overcurrent'; specifically, it's a 'short-circuit current'.
Automatic Switch Interface (ASI)
The CAIRS OSS ASI module is a multiple switching platform provisioning tool that increases the power and accuracy of the CAIRS system substantially. Working in either a single or multiple switch environment, the ASI module is a cross platform scripting language that can communicate to any switch that utilizes ASCII, Binary, XML file configuration commands (i.e. Nortel, Avaya, Lucent, Siemens & Redcom). Although the ASI module carries the complexities of a programming language, all of the hard work is done behind the scenes. When CAIRS users open a work order that requires a switch assignment, CAIRS writes a change request to the ASI sub-folder in the CAIRS database. Watching the CAIRS database real time for new work orders requests, the ASI module interprets each new work order to determine the assignment type. Once the ASI module has successfully programmed the switch it returns an assignment summary to the CAIRS users. The assignment summary notifies the CAIRS user that the assignment has been completed successfully.
A high current flows through a short circuit even if there is no voltage change because the resistance across the short circuit is zero.
Current-carrying capacity of 1000 mcm 5kv rated wire?
The UK wire tables for 1.0 mm2 three-core domestic cable
(live/neutral/earth) specify a limit of 10 amps.
Which devices have characteristics very close to that of an ideal current source?
Most sources attempt to provide a specific voltage by design. An ideal current source does not do this, and thus there are not very many good examples. A current transformer, like what is used for relaying and metering in the power system, is an ideal current source - it provides a direct reflection of the amount of current flowing in the primary side to th secondary side, regardless of voltage in the secondary (up to saturation of the transformer).
A transistor amplifier may be set up as a current source as well. As in the above example, if the output resistance becomes too large, saturation of the transistor will occur causing it's characteristic output to be nonlinear.
A battery is an ideal voltage source in series with a variable resistance (the internal resistance of the battery). A charged capacitor can be thought of the same, without the internal resistance (since this is extremely small compared to the capacitance, it can be ignored in many cases).
A generator could be considered either a constant current source or voltage source, depending on how it is run. In some instances, a constant current will cause output voltage to increase or decrease. This variance can be controlled (to an extent) with external devices (capacitor and inductor banks, switching in and out specific lines, etc.). A generator can also be set up to provide a specific output voltage.
Is current is drop when it flowing through the resistor?
Current flows in loops, voltage drops across elements. With relation to current, what flows in, must flow out, so no, current is not dropped across a resistor, it flows through a resistor and voltage is dropped across the resistor.
Sounds more like you're trying to measure resistance...
What are magnetic shading coils and what do they do in a magnetic motor Starter?
Shading coils provide a phase shift between the magnetic field of the rotor and stator, which is necessary to get the motor spinning.
What is the formula for the series-parallel connection?
/t=/t1=/t2=/t3...
vt=v1+v2+v3...
rt=r1+r2+r3...
series formula....
What are the type of current boosters?
Current boosters are devices that enhance the electrical current in a circuit and can be categorized into several types: voltage boosters, which increase the voltage level; current amplifiers, which increase the current output; and DC-DC converters, which adjust voltage and current between different levels while maintaining power efficiency. Additionally, there are linear and switching voltage regulators, each with distinct operating principles and applications. These boosters are commonly used in power supply systems, renewable energy applications, and electronic devices to ensure stable and adequate power delivery.
What is an example of a circuit that doesnt obey Ohms Law?
The easiest circuit that does not obey Ohm's law is a circuit that has a resistance that depends on temperature. For example, if you take a light bulb and draw a current-vs-voltage, you see that in the beginning (under low voltage) the graph is NOT a straight line, but under high voltage the graph is linear. This is because the resistance depends on temperature. the equation V=IR isn't consistent with the graph's shape.
What cause earth fault in a motor?
The Rotor Protection relay is used in synchronous motors and generators to identify the presence of an earth fault in the rotor winding. While the winding in the rotor is insulated from the ground during normal operation, the Rotor is subjected to stresses due to vibration, heat, etc. These stresses can cause the winding to give way in a particular place and the winding can get earthed.
While a single earthing in the winding is not immediately damaging. It sets the stage for damage if a second failure should occur. The second earthing can cause a short-circuit through the rotor causing extensive damage to the rotor and the winding.
The currents produced during a rotor earth fault can cause excessive vibration and disturb the magnetic balance inside the alternator. These forces can cause the rotor shaft to become eccentric and in extreme cases cause bearing failure.
Hence, it is necessary that any earthing in the rotor is detected at the earliest.
In slip ring rotors, carbon deposits on the slip rings may compromise the insulation resistance of the rotor. Hence, the slip rings need to be inspected for any deposits.
The Rotor Earth Fault Protection Device consists of a current injection device which applies an AC voltage to the rotor winding by means of a slip ring fitted on the rotor. The current is applied to the rotor through a coupling capacitor. In the normal condition, the system is floating and the current flowing through the device is zero as the resistance is high.
When a fault occurs, the current increases causing the relay to operate. The relay can be configured for alarm or trip depending on the criticality.
What ohm value or what combenation of resistors are needed to draw 20amps at 120v?
ohms = volts/amperes
6 ohms = 120 volts / 20 amperes
Why the relays setting for ocef 5 amp?
The relays setting for OCEF (Overcurrent Earth Fault Relay) at 5 amps is typically chosen to provide effective protection for low-current systems, ensuring that any earth fault or overcurrent condition is detected promptly. This setting helps to minimize damage to equipment and reduces the risk of safety hazards by ensuring that the relay trips quickly in case of fault conditions. Additionally, a lower setting can help in accurately monitoring small leakage currents, which is essential for maintaining system integrity.
What are electrical conductors used for?
Conductors are wires that carry the volts and current to and from a device that needs electricity to run.
Other answers
Conductors are the transport media for free electrons to travel along in the form of a current.
The use of a conductor is to carry electricity. For example, a length of copper wire is called a conductor when it is used to carry electricity.
How do I untwist multiple strands of wire?
The easiest way to untwist multiple strands of wire is to hold all the wires in one hand and let them dangle. If the wires are too long to do this, then perhaps a crochet hook will help pull out the knots and untwist it.
How do you work out the numerator of a transfer function?
G(s)= 60Ka / s(s+2)(s+6)
what is the numerator you have to use in MATLAB?
Twin moose acsr for 220 kv ehv line current carrying capacity?
220 KV lines used in Kerala have a capacity of 880 Amps
How to wire the Phase Linear UV7i?
Wire what?...please be more specific. I really want to help you but the question is too vague.
