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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 Meaning of turn down ratio on a pressure transmitter?
This is a number that indicates what range the transmitter will work correctly. This will depend on how strong the transmitter is.
How many milli ohms in 0.15 ohms?
Since "milli" means "thousandth", there are 150 milliohms in 0.15 ohms.
You need to remove everything connected to the breaker and see if it still trips. If it does it is in the wiring or possibly a bad breaker. Disconnect load from breaker and see if it still trips. If so replace the breaker. If it still trips and is not the breaker then you will have to start pulling each outlet from wall and checking after disconnecting each outlet.
I = E/R = 10/20 = 0.5 Ampere
What does the design of decision support depend upon?
Decision support depends on how structured a particular problem that needs solving is.
What is most important in dc power -volts-watts or amps?
You didn't define "importance" so it is hard to tell. They are all related by the formula Watts = Volts x Power Factor. Power Factor varies from zero to one. One thing that is often done in an application is to try to reduce the current and proportionally increase the voltage to obtain the needed wattage. That is why most electric stoves run at 240 volts rather than 120 volts, because 1/2 the current is required at the higher voltage; and you can use smaller wire and connect to a lower amperage breaker.
What is better to brake a motor control braking or dynamic braking?
There are three type of electrical brakes that can be applied to motors.
Regenerative
Plugging in
Dynamic
"control braking" does not mean a correct description.
Dynamic braking is better.
What is the weight of 1meter copper bus bar size 150 10mm?
150×10=1500
1500×8.96=13440
÷1000
kg/meter 13.440
Neutral current is the vector sum of the phase currents. You should be able to add up the phase currents from their polar quantities.
a. the current and voltage in phase
What happens when an ammeter is connected in parallel with a circuit?
SMOKE!!! Yiii-haaaa! An ammeter is always as low a resistance as possible. That way, the current that you measure in a circuit using the meter will be the same as if the meter were not there. So putting an ammeter in parallel with a circuit means that you just short circuited the circuit you were intending to measure. Poof! There goes your ammeter!
An ammeter has a very low internal resistance. So, if it is connected in parallel with a load, it will short-out that load. The resulting high current flowing through the ammeter may severely damage the meter (and possible harm the user), although most are fitted with fuses to protect them.
Yes, the magnet force will cause the motor rotate through a full rotation. So the friend who claims to have built a motor by attaching a shaft to the core of a galvanometer and removing the spring is correct.
CommentDid your friend mention how he managed to manufacture the tiny commutator and brushes that would be necessary for this to work? Or did he explain how he changed the flux concentrator to an armature in order to give the coil some momentum? Because without these additional features, the galvanometer would be completely incapable of rotating more than 180 degrees!
How does a check spring on sewing machine work?
The purpose of the check spring is to maintain tension on the thread as the thread take up arm returns to the top of the stroke pulling the thread back out of the cloth.
The take-up arm follows the needle. As the needle leaves the cloth, the friction between the thread and the cloth forms a loop that the hook inside the machine catches, pulls around the lower/bobbin thread forming the locked stitch. As the take up arm returns to the top of the stroke the thread between the tensioner and the take up arm becomes slack. The check spring pulls on this slack to keep the thread taut.
Proper stitches can not be formed if the check spring is not set with sufficient "snap-back" or tension on the spring. Setting the "snap-back" is by feel. Adjust it from loose to tighter to get good stitches. It is a three way balance between the upper thread tensioner, the check spring and the bobbin tension.
EOT crane:
Overhead crane moves the heavy object from one place to another place in an accurate manner because of crane remote control. And all the heavy objects progress above the head and the heavy objects are lifted through the machine called Hoist. This crane moves in a side to side and backward & forward direction also called a rectangular direction.
The overhead crane operated by a particular device called a radio remote control for EOT cranes. This EOT crane remote control comes in various types and designs. Some of them are 8 buttons and some of them are 12 buttons remote controls. The 8 buttons and 12 buttons hoist crane wireless remote control have their specifications. 12 buttons remote control system has more options than the 8 buttons.
It typically consists of a transmitter device that radiates data in the form of a radio wave in free space with the help of an antenna towards the receiver. The receiver then picks up this signal with an antenna and decodes the data. Radio remote controls are completely wireless systems that can transmit and receive data over very long distances.
How does remote control crane works?
Crane remote control works on the principle of radio waves. When we push the button on the remote control crane then it transmits the signal from the device and the receiver gets the signal. As soon as the receiver gets the data, it decodes and decrypts the data and switches on an assigned relay which activates the desired switch in the EOT Crane Control Panel. The communication between Anand Transmitter and Anand Receiver happens more than 10 times in a second. The transmitter can continuously monitor many parameters of the communication link such as the number of attempts for successful transmission, received signal strength, Link Quality Indication, missed packets, etc. Anand Transmitters and Receivers use the Automatic Frequency Hopping technique to continuously change the transmission frequency to avoid interference from undesired radio signals and increase the safety of the crane.
Where to find industrial crane remote control system?
The best radio remote control for EOT cranes in India are manufactured by Anand Systems Engineering Private Limited. Anand Radio remotes are not only reliable but also customizable according to the customer needs. These wireless remote control for overhead cranes uses 2.4 GHz band. Anand crane wireless remote control can transmit and receive at a range of more than 200 meters line of sight at full power. Software programmed to have a custom range from 10 meters up to 200 meters according to user requirement without changing any hardware. Anand Remotes have been designed from the ground up to transmit signals over long distances at the lowest power possible.
Is there Cable sizing calculator for a copper cable?
Here is a fine Wire Size Calculator. Scroll down to related links and look at "Wire Size Calculator".
What is one source of constant electric current?
Cells and batteries.
A more detailed answer
In general, most power supply sources - including cells and batteries - cannot supply either a truly constant current or voltage.
Because most load devices are designed to require a nearly constant voltage - and not a specific constant current. - most power supplies - including cells and batteries - are designed to supply a given output voltage whatever the current that is being drawn, provided of course that the current stays within a pre-determined designed range of output current values.
One definition of "constant current source" is that it has zero output resistance, which in practice cannot exist.
However, a transistor can act as a constant current source if biased and used in that manner. This can also be done using one of the several standard "voltage regulator" components - which are available from electronics parts suppliers - because they can be hooked-up to act as constant current sources to operate over a small range.
Why star delta timer required for motor?
The timer is used to give the motor time to reach its running speed at the star voltage. Once the timer times out the star contactor drops out and the delta contactor pulls in.
What is a sentence using the word thermocouple?
The thermocouple which measured the car's coolant temperature failed and so the car overheated.
What is the voltage used in Uganda?
It is 240V / 50Hz AC. The plug/socket used is like the one used in Great Britain.
Why would stop lamp bulbs keep burning out easily even with different size bulbs?
Over voltaging a bulb will cause extra wear; spurious voltage signals can have similar effects. The "size" of the bulb has to do with how much power it uses at a specific voltage. If the voltage is increased, it will draw more power than designed to handle.
Advantages and disadvantages of Permanent magnetic moving coil?
1,it has uniform scale
2,with a power ful magnet its torqe to weight ratio is very high so operating current is small
3,the sensitivity is high
Does voltage forces electrical energy though a circuit?
You could say yes. The usual analogy is the height of a water fall relative to the flow of the water in a stream. If the potential difference is great it is similar to a high fall since the height difference is what drives the water down the falls.
Why is there no power consumed in reactive components?
While it seems there is no power consumed in reactive components, the reality is that there is power transfer, which must be considered in the system design.
Power is amperes times volts, but in a reactive circuit, the two are not in phase. If the phase angle becomes 90 degrees (a power factor of zero) the effect will be the appearance of zero power.
Supplement. Consider the transformer for a start. The magnetic susceptibility curve for the transformer core forms a hysteresis loop. That S-shaped diagram you remember. The area inside the loop is power lost in the system, and goes to make the transformer a little warm.
the same applies to any inductor. And there is always a small resistive loss in the copper wire as well.
(Unless you have a super-conductor and some liquid helium to hand.)
The capacitor is next. It works by storing the energy as a distortion of the "crystal matrix" of the dielectric material. Which is not as lossy as the iron core of an inductor, but does have some loss.
In closing, the transformer reflects to the supply side, the reactance of the whole circuit as seen by the secondary side.
What type of electric motors are used in cocoa processing factories?
Standard Induction Motors for general applications. Servo motors in case precision application like packing
