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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
If i use 1930 kWh in a year how many Kw is that?
Since there are 6366 hours in a year, 1930 kWh is about 0.3 kW per hour. (1930 / 6366)
Why is the lead polarity not significant when measuring AC voltage?
Because the polarity is changing at a 60 Hz rate. Hence the world alternating in AC.
Will a 220v 60Hz US mig welder work with a 220v 50Hz supply in Africa?
Hi - it should be OK but the transformer might overheat a little if it is used intensively, so it need to be used carefully. The reason is that the magnetic flux in the core is 15-20% greater at 50 Hz, and that increases the heat produced in the transformer.
Going in reverse, a 50 Hz transformer will work fine on 60 Hz.
Why in equal resistor in parallel circuit have same currents through them?
Because the potential difference V would be the same
I = V/R
As V remains the same, then as R is the same then I too would be the same
Is the load prong on a toggle switch the constant power source?
No the power comes from something other than the switch.
What is total AM transmitter power if carrier power 100W modulated with modulation index m0.7?
The instantaneous transmitter power will peak at 170 watts, but will bottom out at 30 watts, at intervals that correspond to peaks and valleys of the audio waveform with the maximum amplitude. The transmitter power during quiet intervals, as well as the long-term average, is 100 watts.
What is the power capacity of the electrical sub-station wherein the ocean adventure was connected?
can u give me unswer the ELECTRICAL POWER INSTALLATION?
When was the first practical application of electricity?
It was in 1800, Alessandro Volta made a battery (also known as a voltaic pile), made from alternating layers of zinc and copper. This battery provided scientisists with a more reliable source of electrical energy that the electrostatic machines previously used.
What are the advantages and disadvantages of the third generation?
The advantages of the third generation computers are:
1. faster
2. smaller
3. uses less energy
4. uses high level programming
5. cheaper
7. lower maintenance cost
the disadvantages are:
1. still require air conditioning
What are the factors which effetcs ignition lag?
it is same as ignition delay. it is the time gap between the injection of fuel and the first particle of mixture which get ignited
The cross-sectional area of a #22 AWG wire is 0.326 mm2 .
the low frequency signal which is nothing but the message signal
Neither. The envelope will be that of the difference beat frequency. To get the envelope to follow the low frequency input signal you need to mix (multiply) the two signals, not add them.
What is the difference between MOSFET and thyristor?
They are both commonly used electrical switches. Some of the differences are that whereas Mosfet switches are voltage driven devices and can only switch DC current, Thyristor switches are current driven and can switch both AC and DC.
What is ment by the time constant of a 4700F capacitor is 12seconds?
Capacitors don't have time constants. The combination of a capacitor and a
resistor has a time constant. It's equal to the product of the resistance (ohms)
and the capacitance (farads), and has the units of time.
When the capacitor is allowed to discharge through the resistor, the voltage on
the capacitor and the current through the resistor both decrease steadily as the
capacitor empties. The time constant is the time it takes for those quantities to
decrease to 36.8% (1/e) of what they were one time-constant earlier.
4,700F is an enormous capacitor. But OK, if that's its real value, then in order to
have a time constant of 12 seconds, we can calculate the resistance like this:
RC = 12 seconds
R = 12/C = 12/4,700 = 0.00255 ohm.
Now we ( I ) understand what the question is talking about !
0.00255 ohm is not an external resistor connected in series with the capacitor.
It must be the effective internal resistance of the capacitor itself. The performance
spec of 12 seconds for the device is telling you that it has a very low internal
resistance, so you can get current (energy) in and out of it fast. As a circuit-
design component, it blurs the distinction between a capacitor and a battery.
There are situations where the secondary of a transformer is not grounded and the neutral is not connected to the neutral of the primary. This can cause a potential shock hazard so the secondary side needs to be protected.
A motor starter will have a set of auxiliary contacts which is used to provide a?
Feedback to a control circuit that the motor starter has closed or opened its contacts as commanded.
How many diodes can be used in center tap type rectifiers?
There are two diodes in a standard center tapped configuration of a rectifier. This is per phase, so if you had a three phase system, each winding having a center tap, all of which are connected together, you would have six diodes.
Why is capacitor start motor used for printing press?
A printing press is a very heavy piece of equipment that needs a lot of power to get going. A capacitor start motor is used because it has the ability to supply a lot of power on startup.
What is the basic unit of charge?
- The SI derived unit of electric charge is the coulomb(C).
- In electrical engineering, it is also common to use the ampere-hour (Ah).
- In chemistry and particle physics, it is common to use the elementary particle charge (e) as a unit.
Independent of units, the symbol Q often denotes charge.
How do you calculate the capacitance between insulators and conductors?
The voltage distribution across insulator strings is not equal, this because exist capacitances beteween insulators and tower and between insulators and conductor. So how i can calculate the stray capacitances across insulator strings?
I don't know which one it is a ,current spiking,,,,,,impedance matching,,,,,latent heat,,,,,,power factor
