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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
EFF 1 is an abreviated name to classify a specific type of engine believed to be more energy efficient!
What is the voltage at which a super grid operates?
The voltage at which a super grid operates can vary depending on the specific grid and its design. Generally, super grids operate at very high voltages, typically in the range of hundreds of kilovolts (kV) to several hundreds of kilovolts (kV), or even higher. These high voltages are necessary to transmit large amounts of electricity over long distances with minimal losses.
Since E=BLV (Equation for a moving conductor) Solve the equation for V to get V = (E/BL) E = EMF given, which in this case is 110. Convert it to Volts. E = .11 volts
V = .11volts / (.98 T * .132 M) = .850 m/sec
What is the difference between the voltages in the coils A and B in three phase generator?
I assume that you are referring to phase A and phase B? So what happened to phase C, in that case?
The answer is that the magnitudes are the same, but phase B (and phase C) are displaced by 120o. The normal phase sequence (the order in which each voltage would reach its peak value) would be A-B-C.
Why do you neglect iron loss in transformer during short circuit test?
in short circuit test we apply rated current with the LV side shorted.so the applied voltage will be very low. iron loss depends on the applied voltage.so it is neglected
How is current controlled in welding transformer?
in welding machine, the transformer used is basically a current transforrmer. so by changing the tap of secondary side of transformer, we can increase or decrease the current in the transformer.
Is the sum of the potential differences equal to the voltage applied across them?
Yes for a closed circuit
Thevenin's theorem is applicable to a network of?
thevenins theorem is applicable to network which is linear ,bilateral
Why is millman's theorem called parallel generator theorem?
Because millman's is used in parallel ckt of impedances and voltage sources
What is formula for calculate size of cable?
CABLE and WIRE are not the same thing.
Cables are sized by the diameter of the longest side (romex isn't round, it's an oval, compared to CAT 5, which is round)
Wires are sized based on the type of insulation and gauge of copper.
Then you take that info to the code book. A chart tells you the answer. BEWARE: multiple cables or wires in a conduit changes the equation.
Whether or not more will fit, the only correct way to size cables or wires is to use the Code Book.
For UK InstallationsThis topic is covered in Appendix 5 of the On-Site Guide supplement to BS 7671:2008 Requirements for Electrical Installations (the 'IEE Wiring Regulations'), although this Appendix only relates to the ease with which cables can be drawn in, and does not take into account the effect of 'grouping' (i.e. the effect that the temperature of each conductor will have on the rest). The number of cables permitted depends upon (1) the total cross-sectional area of all the cables drawn in, (2) the length of run, and (3) the presence of bends.
The effect of 'grouping' is to reduce the number of cables actually allowed within a conduit (or other enclosure), because, as the number of circuits increases, the current-carrying capacity of the cables reduces. Guidance on this is provided through 'space factor', which is the ratio of the (total csa of all the cables) to (the internal csa of the conduit), expressed as a percentage, with the maximum permissible space factor being 40%. The remaining 60% space is required to allow the dissipation of heat from the cables. (As the first answer indicates, the csa of a flat cable is based on the maximum width of that cable).
How do you improve my arms power?
To improve your arm power, focus on strength training exercises such as push-ups, pull-ups, and weightlifting that target the biceps, triceps, and shoulders. Incorporate explosive movements like medicine ball throws or kettlebell swings to enhance power. Additionally, ensure you maintain proper form and gradually increase the weight or resistance to promote muscle growth. Lastly, don’t forget to include rest and recovery in your routine to allow your muscles to repair and strengthen.
What size motor does proform 595le have?
The ProForm 595LE treadmill is equipped with a 2.0 continuous horsepower (CHP) motor. This motor is designed to provide a smooth and durable performance for walking and light jogging. It's suitable for home use, offering a balance of power and efficiency for users at various fitness levels.
No, you should not get a shock if you touch the earth wire!
If you do get a shock then something has been hooked-up wrongly or has become disconnected, in which case, if you do not really know enough about electricity to fix it yourself, you would need to call in a professional electrician urgently to correct the fault before someone gets electrocuted!
The type of "multiple earthed neutral" mentioned in this question, also known as PME (for Permanent Multiple Earth) is commonly used in many countries nowadays to provide electrical safety earthing. The reason for using it is that it has been proved to be much more reliable than the "old-fashioned" method which, at each property, uses a separate earthing rod or the water pipes. (Using only an incoming water pipe coming from the ground at a property can be veryunreliable from an electrical safety point of view!)
The Neutral is simply a "return" wire: under normal circumstances it carries current back to the power station after it has been fed to appliances by the "hot" or "live" wire.
More information about these topics is contained in the answer to the Related Question shown below.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS KIND OF
WORK SAFELY AND COMPETENTLY
ALWAYS REFER THIS WORK TO QUALIFIED PROFESSIONALS.
Can you wire the load side of a transformer to operate the line side and get higher voltage?
Yes, it is called back-feeding and should only be done by a qualified electrician who has actual experience with this type of installation. Look up buck and boost transformer connections.
What is the minimam distance of IS cable and non IS cable in same tray or trench?
It should add a divider between this different type cable to prevent the interference Type your answer here...
Why does my TO-220 LM7805 regulator need an insulator before a heat sink?
The case of the TO-220 LM7805 regulator is device ground. If the heatsink is also ground, you do not need an insulator. If the heatsink is not ground, or if you need to maintain distinct grounds, or if the LM7805 ground is something else besides ground, you need an insulator. Its up to you, since you are responsible for system and circuit design.
How a person can earth a conductor?
Inside a building, you connect the conductor to the AC outlet ground (the circular hole in the wall outlet). Outside the building, the conductor can be connected (soldered, for example) to a copper pipe which has more than six feet underground in soil.
Warning: never work with electricity, no matter that it is just for a second, unless you have taken safety classes and basic lessons in electricity. People go to school to be an electrician.
Why not ultrasonic be produced by passing high frequency alternating current through speaker?
The ability of a speaker to produce ultrasonic output when driven with high frequency AC depends on the design (intent) of the speaker. Typical audio speakers are not designed to go ultrasonic - the cone's mass and resonate frequency just won't support it. Also, the coil reactance is too high for ultrasonic waves so they cannot be produced.
What is neutral negetive sequence current?
Negative sequence current is defined as 3I2 = (phase 1)*(1angle 0) + (phase 2)*(1angle 240) + (phase 3)*(1angle 120)
Negative sequence current is seen in three phase power systems due to natural system imbalance. Also during unbalanced fault conditions such as line to line, Line to ground, and line to line to ground faults. It is not seen in purely balanced three phase faults.
