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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
This is a common misconception. A standard 240 utility feed, common in the US, and a 120/240 feed are one in the same, the exact same thing. It is called (historically) an Edison connection.
If you have a 240 volt single-phase supply, with two hot conductors, a neutral, and a ground wire, then you already have 120/240 service.
If you do not understand the terms above, then hire a qualified electrician to make the connection for you.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do this work yourself, always turn off the powerat the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator
to insure the circuit is, in fact, de-energized.
Will overcharging cellphone cause electrical short circuit?
No, overcharging cellphone will not cause an electrical short circuit.
Which dielectric in this world has highest dielectric constant?
Strontium Titanate has a dielectric constant of 233.
TDK in Japan makes Ultra-high Voltage Ceramic Capacitors using this as the dielectric material.
Compared to distilled water at 76.7 - 78.2 (lowers as temperature rises).
Types of glass can vary between 4 and 10.
Assume the rating of 100W refers to operation on a supply of 117 volts.
Power = (voltage) x (current)
Current = (power) / (voltage) = 100/117 = 0.855 ampere (rounded)
Power = (voltage)2 / (resistance)
Resistance = (voltage)2 / (power) = (117)2 / 100 = 136.89 ohms
Engineers that I have worked with state in their specifications that all meggered wires must have a reading of 5 Meg ohms or higher. If the reading is lower that this benchmark start checking splices especially if it is an underground installation. Water usually accumulates in underground conduit systems and when the wires are pulled in there is a certain amount of conductor scraping. This starts the downward spiral from infinity. Check termination points close to the exit point of the conduit. A certain amount of evaporation from the conduit condensates on the terminal points.
For linear supplies, the straightforward answer is: THE VOLTAGE GOES DOWN.
For regulated unipolar switching supplies (all bets are off), it is likely that your pulse width will increase until you are at the regulated voltage set at the chip. Not all DC supplies behave the same way.
What is a dedicated logic circuit used for?
A dedicated logic circuit is generally used to perform one task. Not usually programmable. Say for example a lift (elevator) control; where inputs are received from the lift position, door position, floor etc and logic outputs to motors etc from the logic performed.
How many volts to run a 48 Volt club car electric motor?
If a 48 Volt club car electric motor requires 48 volts, then it should be given a 48 volt power source, or something close to it. Too many more volts and it may burn out; not enough volts and it may not run or it will try to draw too much power and burn out the power supply.
What is the Measurement of power energy power factor?
Power - Watt. Energy - Watt Hour. Power factor - no unit. just number less than or equal to 1.
What is the 10 hour rating of a battery?
It is the discharge rate of the battery rated in ampere hours. Yours could be any combination from 10 amps for 1 hour up to 1 amp for 10 hours. eg. 5 amps for 2 hours, 2.5 amps for 4 hours.
Will transformer operate if a battery is used for the input voltage across the primary?
Transformers only work on a.c. This is because it's necessary to have a changing primary current in order to induce a voltage into the secondary winding.
If you connect a battery across a transformer, it will not work. Furthermore, if the voltage of the battery matches that of the rated primary voltage, the resulting very large d.c. current is likely to overheat the primary windings and even burn it out.
You can buy tester's that will do it for you. Try ebay.
What is voltage in rotor of 11 KV AC generator?
Star (or 'wye') connected alternators have a phase voltage of 6.35 kV, and a line voltage of 11 kV. Incidentally, it's 'kV', not 'KV'.
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How slip ring generate ac and dc currents?
A rotating loop within a fixed magnetic field naturally produces an alternating voltage. Slip rings and brushes are used to connect that rotating coil to a fixed external circuit and, so, provide an alternating voltage to that external circuit.
To provide a direct voltage, a split-ring commutator and brushes are required, which is a rotating switch which reverses the polarity of the coil's output every half cycle.
What is the difference between brushless RC motors and brush RC motors?
Brushless are 10x more powerful than brushed and use 3 wires instead of 2. And most brushless motors are outrunners, meaning the spinning part is outside not inside.
Substations may contain uninsulated high-voltage lines, busbars, and other equipment. Although this live equipment is mounted at a safe distance from trained personnel, those unaware of the hazards may approach the live equipment without realising that the voltages are high enough to break down the insulation of the air if they should approach within the safe distance limits, with lethal results.
How much voltage does a transformer reduce for home use?
IT depends on the voltage that is at the powerlines. Ibelieve the common residential powerline voltage is 2160v and your house is 120/240v
A device that protects a circuit from current overload is called?
Fuses or circuit breakers are termed 'overcurrent protection devices', which protect circuits from either an overload current or a short-circuit current.
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What is the power voltage required for a Bose Lifestyle 5 audio system?
The system has a dual power system. It can be used with either 120 volts in the US or 220 volts in other countries that use that voltage. It is recommended that you purchase the system in the place where it is to be used for the best quality output.
What is the purpose of a gland in electrical installation?
Glands in the electrical trade are used to make a seal between two electrical components. For an example; a cable coming into a weather proof junction box requires a sealing gland connector to keep the integrity of the junction box's weather proof rating where the cable enters into the box.
Gland also used to ensure that the metallic armor is in contact with the cabinet on which it gets fitted. But these days where plastic boxes and plastic glands are being common this practice is rarely applied nowadays.(In India)
Gland ensures that there is no unnecessary pressure, stress on the cable conductor, but firmly holding it on to while providing a reliable entry of the cable into the box.
In North America any cable holding device that is not water proof is called a cable connector.
a bowl of cereal
amps 'an electrical measure of current.'
An ammeter is an instrument used to measure current (amperes), you dont measure ammeters!
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