Electrical Engineering

Voltage and current are important parameters in any electrical and electronic devices and apparatus, including robotics.

Power factor (PF) is calculated and PF=cos(phi) where phi is the phase angle of the current running through a load. To find the phase angle of the current, one must know the voltage drop across the load and the total impedance (capacitance + resistance) of the load and then use Ohm's Law to find the current. The total impedance of a capacitor is 1/(j*w*C) where j = sqrt(-1), w = 2*pi*f (f = frequency), and C is the capacitance.

To find the correct value of capacitance for a PF of 0.9 lag, you need to know the total impedance of the load which includes the value of the resistance and the configuration of the load (parallel, series, or some combination).

Green= Ground

Black = live

White = Neutral

i have never heard of a commentator in a motor, think you may be mistaking that word. inside an electric motor you have a stator and windings, as polarity changes it spins the stator and the brushes transfer the charge to the device being used..

I think they meant commutator. If you break an electric motor down to 2 parts, you have a commutator and an armature. the armature being the shaft that basically floats on bearings, and the commutator being the hull where the stator is. (and there is such thing as a brushless electric motor.) the stator does not spin. that is the term used for the magnets that pull the electric field supplied by the brushes. To make even more simple, imagine a shaft floating on bearings with 2 magnets on it, one positive and one negative ( the armature) and this shaft is inside of a ring of electricity the is flowing in one direction, its going to pull the negative and push the positive (the commutator) and cause the armature to spin.

The difference between a Dy11 (delta winding lags the wye winding by 30 degrees) and a Dy1 (delta winding leads the wye winding by 30 degrees) is a phase shift. One is not better than another in a general sence. Depending on the configuration of the plant and surrounding power lines and transformers, one may be more beneficial than the other by allowing the plant to sync to the grid through multiple sources without first disconnecting.

Yes. You can check the datasheets and will see that MKP has better properties than MKT. But MKT is cheaper.

A phase sensing relay monitors all three incoming phase legs at once. With the relay the operator has the ability to set the trip points in a percentage of incoming line voltage. If the voltage in any of the monitored legs falls below the operators set point the relay will trip and take the monitored device off line. If it is a motor being protected, the auxiliary contacts on the phase sensing relay will change state and its N.C. contact will open. The motor's contactor coil is in series with this auxiliary contact so with the stoppage of current flow to the magnetic contactor's holding coil, the contactor opens cutting off the supply to the motor.

There are several types of ballasts. I assume the one you are talking about is the one used in voltage conversion, similar to the type used in flourescent lighting. A multitap ballast would have several points (connections) that one could connect to, to obtain different voltage output. For ex., 1 tap might ouput 5000 volts, the next tap might ouput 5500 volts, the next 6000 volts, etc.

owned property and thus had a stake in society.

covernor

The degree of freedom (DOF) of a robotic arm can be computed based on the number of the joints and types of the joints. For most robotic arm, the joint is either prismatic or revolute(about one axis), the DOF is simply the total number of the joints.

I have to know the amps and voltage of the garage door motor and the length of time the door takes to open and close to answer this question.

Why would you want to? It is in the system for a reason, namely to turn the compressor on and off according to the schedule set by the thermostat. If you bypass it, you would be forcing the compressor to run when the rest of the system isn't, which sounds like a recipe for disaster.

V=voltage at 4amperes, 12.2V I=Ampere, 4A V V= E-Ir r=(E-V)/I r=(12.6-12.2)/4 r=0.1 ohm

wind energy can be transformed into mechanical energy by wind mills .

A multimeter is used in which there is options for multirange measurement of Ac current or voltages and resistances and also DC voltages

Using the formula,V=U-IR,where V is the voltage after drop,U is the voltage at the supply,iI is the current and R is they resistance.

V=5,U=8,I=0.01,R= ?

5=8-0.01R

8-5=0.01R

R=3/0.01

R=300ohms

hi.. this is pankaj working as power engineer. we have a 11 kw induction motor which is used in fluidising blower. its no load current i sarround 9.5 to 10.6 amp. and under load its ampere does nt exceed 15 amp. its winding resistance is 1.4 ohm.

To adjust for the changing (dropping) voltage of the internal battery, so you can still get accurate readings. When you can no longer adjust to zero, replace the battery(s).

A: It may tattoo your face when it blow up if the 25 volts is used where a 50 volts should be, you may substitute 47 mfd 500 volts for the 50volts cap and the 25 volts cap But you cannot substitute 15 volts for the 25 volts capacitor

Single phase connection has 1 phase wire and a neutral wire. Another wire for protective earth.

In three phase system, motor can be connected in star or delta. Most AC induction motors are in Delta. Power distribution system is generally 3 phase 4 wire. Transmission system is 3 phase high voltage.

Industry uses 3 phase system, where as 1 phase is for domestic, commercial applications.

Both 1 and 3 phase system has a frequency. It is either 50 Hz or 60 Hz, depending upon the country or region.

yes

If the circuit was open, the tram's motor could not run!

6 dB per octave. The slope outside the pass band is 6 times the order, in dB/octave.

The side of the transformer that has the ohm CT which translates into a winding on the transformer that has a center tap . This side of the transformer was likely attached directly to the audio output transistors set up in push pull configuration. This is what the center tap is for. This side of the transformer would have a higher impedance and is directly driven by the power supply to provide amplification The transformer also isolates the amplifier voltage from the other side which is of low impedance. This may be in the range of 8 to to 16 ohms which would be directly tied to a speaker.