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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
What is the use of SPST in experiment?
A single pole single throw switch (SPST) is used to open or close a contact to a single wire. It can be used as an on/off switch for an appliance or for a light bulb.
How can you say diode is gone in generator bridge rectifier?
The most straightforward and unbiased way is to remove the diode from the circuit and check it with a diode tester. Alternatively, if the diode is shorted, the bridged will measure shorted. If it is open, running the generator and monitoring the output with an oscilloscope will reveal a missing phase.
One example of an open diode problem in an automobile alternator application is that the alternator will put out enough current to keep the system fail light off, but not put out enough current to meet rated output load.
What are the types of plans that organizations can use?
Plans commit individuals, departments, organizations, and the resources of each to specific actions for the future. Effectively designed organizational goals fit into a hierarchy so that the achievement of goals at low levels permits the attainment of high-level goals. This process is called a means-ends chain because low-level goals lead to accomplishment of high-level goals.
An operational plan is one that a manager uses to accomplish his or her job responsibilities.
A tactical plan is concerned with what the lower level units within each division must do, how they must do it, and who is in charge at each level.
A strategic plan is an outline of steps designed with the goals of the entire organization as a whole in mind, rather than with the goals of specific divisions or departments. Strategic planning begins with an organization's mission.
Contingency planning involves identifying alternative courses of action that can be implemented if and when the original plan proves inadequate because of changing circumstances.
It's true, but only for a constant applied voltage. It turns out that the current in that wire is also proportional to the voltage applied to the circuit. Here's how it works.
For a given applied voltage, current is (inversely) proportional to resistance. More resistance (for that same applied voltage) makes for less current will flow. Less resistance (for that same applied voltage) means more current will flow. We say that current and resistance are proportional because for a given voltage, when one goes up by "X" amount, the other goes down by the same proportion. Double the resistance, current is cut in half. Ten times the resistance will allow only one tenth the current. And we say inversely, because the change is in the "other" direction. When current goes up, resistance must have gone down (for that same applied voltage). Here's the other half of the idea with current and voltage and a given value of resistance.
In a circuit with a fixed resistance, more voltage will drive more current. Less voltage will drive less current. They're directly proportional. That means if you double the voltage, you'll get double the current (through the same resistor). If you cut the voltage by a factor or ten (one tenth the applied voltage), you'll end up reducing current by a factor of ten (one tenth the current) for that same resistor. We usually think of circuits this way, but we can also think of them in other ways according to Ohm's law. Let's summarize.
Voltage (E) is expressed in volts (V), and current (I) is expressed in amps (A), and resistance (R) is expressed in ohms (upper case omega).
E = I x R (E equals I times R)
R = E / I (R equals E divided by I)
I = E / R (I equals E divided by R)
AnswerFalse. Ohm's Law, in essence, states that the ratio of voltage to current is constant for variations in voltage. No mention of resistance whatsoever! However, for those materials that obey Ohm's Law ('linear' or 'ohmic'), raising a conductor's resistance will cause the current to fall (assuming the voltage is fixed). so the current must be INVERSELY proportional (not proportional) to the resistance!It's a unit of power. MW- Mega Watt and 1MW= 10^6 Watt (or 1000 kW).
How long can you keep Corona beer if it's not open?
If the cap is secure, you can keep it indefinitely!
Practically, one summer.
If it smells "off' or musty, Discard!
What does alternating current mean?
An alternating current (AC) is an electrical current whose magnitude and direction vary cyclically, as opposed to direct current, whose direction remains constant.
The word 'alternating' itself means "changing of direction of flow".
The usual waveform of an AC power circuit is very close to a sine wave because this is the way the electricity is generated in the power plants. It also allows us to efficiently transmit the energy by transforming it to higher and lower voltages.
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AC, or Alternating Current, does exactly what the name implies. In USA, Canada - and in other countries which use the same service frequency - the direction of the current changes 60 times a second (also called a frequency of 60 Hertz) within the 'Hot' wire (also known as the 'Live') - often colored Black - and the Return or Common wire (technically known as the 'Neutral'), which is usually colored White.
In Europe and many other areas of the world, the service frequency is 50 times a second (50 Hertz) within the 'Live' wire which is colored Brown (but on older systems it is colored Black) and the Return or Common wire (technically known as the 'Neutral'), which is colored Blue (but on older systems it is colored Black).
It is the service frequency which makes the typical "humming" sound you hear from transformers or electric AC motors when they are running.
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During just one cycle of a single-phase alternating supply, the "live" or "hot" wire of an alternating voltage (or current) supply goes from zero to its positive peak, then back to zero, then continues on to its negative peak and back to zero again.
These positive- and negative-going parts of each cycle are always voltages (or currents) relative to the "neutral" wire. A neutral wire is necessary to allow the currents to return to the alternator.
In a 60 hertz supply there are 60 such cycles in each and every second. Similarly, there are 50 such cycles in each and every second in a 50 hertz supply.
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The good link below "AC, DC and Electrical Signals" gives a lot more information about the difference between alternating current and direct current.
What happens if power factor crosses unity in electrical system?
wire will be heated with out any load
AnswerNothing. It simply means that the current becomes leading if it was lagging, or vice-versa.
What is top oil temperature in transformers?
Power transformers are partially filled with a specialized mineral oil that serves as both electrical insulation and a cooling medium. Heat generated in the transformer windings and core is dissipated into the oil which is moved through heat exchangers (radiators - much like your car) either by simple convection or pumps.
The term "top oil temperature" is simply meant to represent the temperature of the oil as measured near the upper surface. Since heat rises, this point of measure is considered a good indication of the general performance of the transformer cooling system. In addition to "top oil" many large transformers are equipped with a "winding temperature" indication. Because the heat originates in the windings, a specialized oil temperature estimate is created that is weighted by current flowing through the windings. Winding temperature provides an early indication of the heat the oil will subsequently be required to dissipate.
After which scientists was the unit ampere named after?
André-Marie Ampère (20 January 1775 - 10 June 1836)
You want to know about the voltage selector circuit using transformer?
the voltage selector circuit is used for converting input electrical energy through the voltage selection circuit,which is arranged within the transformer body with its two ends electric allay connected to an input port and an output voltage connection device must be plugged in a socket portion on the transformer body to initalize a micro control unit through feedback to change a volatage value sent to a voltage transformer unit and in turn change the voltage of output electrical energy until a display device displays an ideal output voltage value. Then, the user removes the connection device, and the voltage value of the input electrical energy is converted into corresponding to the selected
What is the definition of audio-frequency transformer?
An audio frequency transformer is a transformer designed to operate in the range of frequencies audible to the average human. This range is generally accepted to be from 20 Hz to 20,000 Hz. The usual purpose of an audio transformer is to match impedances between circuit sections. For example: between a microphone and the input of an amplifier, (input transformer), or between the output of an amplifier and the loud speaker. (output transformer).
What is the use of diodes in doubler voltage?
A: The purpose it to block the capacitor from discharging to the source
What happens when a bulb fuses?
It's not widely realised that incandescent lamps have a fuse element in series with the lamp base and the filament. This fuse is designed to prevent the lamp exploding in the event of a failure of the filament which results in it being short circuited.
Is three phase induction motor used for hoisting device?
ya three phase squirrel cage induction motor used to hoist travel application in industrial cranes
Do individual lines in a parallel circuit have different currents flowing through them?
They can.
The current in each "line" (correctly, *branch*) depends on (i) the applied voltage and (ii) the individual resistance in each branch.
If the branch resistances are different, the branch currents will be different.
Ohm's Law will let you calculate the individual currents.
One is just as safe as the other. The deciding factor here is what supply voltage do you have at your establishment to operate the welder a single phase or three phase service.
In bathroom design what two electrical safety features must always be followed?
First off all electrical switches have to be out of reach from the bath tub/shower. Secondly all electrical wire or cords should be out of reach from the shower or tub
