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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
When measuring current always place any type of meter in series with the circuit--is this true?
No. While it is true that one can measure current at any point in a circuit by breaking the circuit at that point and inserting the meter, not any meter will do it. One must use an ammeter to measure current.
Answer: less.
Answer: Kirchhoff's Current Law states that the sum of all currents into a junction (or out of a junction) must be zero. This refers to the algebraic some, that is, if you consider the current into the junction, any current entering the junction will be counted as positive, while any current leaving the junction will be counted as negative. Thus, any individual current will be equal to the negative of the sum of all the other branches at the junction.
What the main different between shunt motor and induction motor and AC motors?
induction motor is AC motor also synchronic motors are AC motors but second one has not slip but first one has slip . shut motor is DC motor
Why do you use a dc capacitor in table fans while an ac capacitor in a ceiling fan?
there is no separate capacitors for AC and DC. All capacitors are same. Electrolytic capacitors are manufactured by creating a die-electric by chemical etching or electroplating on one plate. Such capacitors when connected in AC circuit dislodges the die-electric material and thus results in short circuit between the two parallel plates of the capacitor. For AC circuits only non-electrolytic capacitors should be used. The common type is oil impregnated paper capacitor.
How do you find the nameplate motor when the nameplate motor is lost?
you can call the manufacture who made the equipment with a model number and serial number of that particular piece of equipment. for example in blower assembly or ac unit
By Ohm's law, current is voltage divided by resistance.
In order to determine which circuit draws more current, you need to look at voltage and resistance. Assuming similar voltage, then, less resistance would result in more current.
Now you need to know the values of the resistors in both cases. You did not state those important pieces of information. The net resistance of two resistors, R1 and R2, in parallel is R1 time R2 divided by (R1 plus R2). All you need to do is calculate for the two cases.
If the two resistors were the same, you can generalize the answer by saying that, with contant voltage, two similar resistors in parallel will pull more current than one similar resistor - specifically, two will pull twice the current of one.
An isolation transformer has 500 turns on the primary winding how many turns are on the secondary?
An isolation transformer is intended to isolate the ground path in the primary from the secondary while maintaining the same voltage on the secondary. This means a turns ratio of 1 to 1. If there are 500 turns on the primary, then there will be 500 turns on the secondary.
In a DC circuit is there an alternate to rheostat for controlling the battery voltage?
In a DC circuit, one alternate to the rheostat for controlling battery voltage is a voltage regulator. You could build a linear regulator, but you need to consider the power that might be dissipated - this would be the same amount of power dissipated by the rheostat. You could also build a switching regulator - this would be more complex, but it could be more efficient because the dissipation across the regulator would be less.
How much do power balance bracelets cost?
It is normally about $100 - $250 for a bracelet, and 50 - 150 for a necklace.
What is PIV.Why PIV of a semiconductor diode is important?
peak inverse voltage... piv of semiconductor is impoetant bcz we need to know after a peak voltage the diode get breakdown or damaged... so we need to know the peak voltage. piv is a point which withstands the maximum reverse biased voltage. after which the diode get damaged.
What are the methods of stopping a synchronous motor?
My experience with synchronous motors is in the operation of large rotating mills. In that case, the motors are decoupled from the load by means of an air-clutch, and main power is removed from the rotor and the stator. The motor coasts to a stop.
If the motor is operated on a variable speed drive, it could be decelerated to very low speed before removing power.
Capacitor circuits which smooth out rectified ac voltage are known?
You bet they are known. They are used all over the place, probably several in your house.
What does a dc power supply do in a electric motor?
A DC power supply supplies directional current in an electric motor. This is significant because many motors run on directional current, or DC power; it's easier to convert to kinetic energy than alternating current (AC), which is generally used to transmit power over long distances.
What is the difference between the working voltage and test proof voltage for dielectric footwear?
Working Voltage is the voltage at which the boot is safe at. Test Proof voltage is what the boot was tested up to before it failed. However you must keep in mind that if you are in wet conditions that can significantly lower the rating of the boot. Also voltage does not kill you it is the amperage.
Would you expect to find an alternating or direct current in the secondary coil of a transformer?
An Alternating Voltage is induced in the secondary winding. When connected to an external load, you will have an alternating current.
How does a distance protective relay work?
The distance relay trips when a fault occurs at a distant or a remote place in the electric transmission line. There is a mechanism based on the impedance calculation of the distance of the transmission line after which it is accurately known where the fault has taken place. Thus the distance protective relay can trip the circuit & prevent the fault to be carried further and also can indicate the location of the fault.
What is the difference between electronic and electrical?
Its all electrical, but referring to electronics would be solid state devices such as tiny resistors ,tranistors soldering work found on devices such as Computer chips and Vehicle ECU's
Is impedance triangle a phasor diagram?
Most definitely not, as resistance, reactance, and impedance are not themselves phasor quantities. However, it is derived from a phasor diagram (by dividing a voltage phasor diagram by the reference phasor, current).
Why an open ttl gate behaves as a logic high input?
because TTL have a bias input setup to eliminate noise therefore the output will follow the logic one input if left open
