Electrical Engineering

the resistance of a diode is .4 ohms is made of tantalum or .7 ohms if made of silicon.

ANSWER: THE RESISTANCE OF A DIODE IS SIMPLY V/I the impedance however is defines by Boltzmann constant

A: That is no such a diode but if it exists it will have unlimited reverse voltage capability the forward voltage drop will be zero no matter of current flow and it will remain so regardless of temperature changes

A conductor is a material which allows elctronic flow through it with some finite (though usually very small) resistance as opposed to a dielectric, the other name for an insulator, that provides ideally infinite resistance to current flow at all temperatures.

hartley oscillators are mainly used in radio receivers.

Also note that due to its wide range of frequencies it is the most popular oscilator

GFI's (Ground Fault Interruptors) measure the difference between the hot conductor current and the neutral current. In a normal (no fault) circuit, every single milliamp of current flowing out of the hot should return through the neutral. In other words, the two currents should be equal. If there is a ground fault, at least some of the current flows from the hot. through the fault path, to ground. In this case the neutral current is less than the hot current by however much is flowing to ground. The GFI senses this difference and trips, opening the circuit. GFI's are designed to protect equipment from damage and trip at around 30 ma. of differential current. GFCI receptacles (Ground Fault Circuit Interruptors) like the ones you might find in your bathroom, and GFCI circuit breakers are designed to protect people, and trip much lower, around 5 ma.

You can't really convert that. If you multiply volts and amperes, you get watts, a unit of power. Watts is equivalent to joules/second. If you multiply volts x amperes x seconds, you get joules.

Make sure they are locked to up prevent theft.

The question succeeds brilliantly in avoiding the target cleanly and completely.

Of the three units listed, none is used to measure electrical 'current'. The unit

of current is the "ampere".

An ideal diode is a simplified model of a diode that does not exist but is used for simple circuit analysis.

A practical diode is the real thing. A model of a practical diode used for circuit analysis purposes includes many parasitic components in addition to the diode.

The diode is a unidirectional device it allows current to pass through it only when it is forward biased and does not allow when reverse biased

when ac signal is supplied in the positive half cycle of the ac wave signal the diode will b in forward biase n in the negative half cycle it is in reverse bias .Hence it allows only the positive half cycle current to flow through it

the resultant wave form will b only in one direction ,i.e,dc signal with ripples.

only half of the wave is rectified hence it acts as a half wave rectifier

I = E/R, Current (amps) = Volts/Resistance

Supervisory Control and Data Acquisition.

AC stands Alternating Current, a type of electricity that changes constantly from one polarity to another(like what you get from the wall outlets). DC stands for Direct Current, a type of electricity that maintains its polarity all the time(like what you get from a battery). AN AC/DC converter is something that turns outlet-type electricity into battery type electricity.
RECTIFIER s can convert ac to dc.the different types of rectifiers are halfwave,full wave,bridge rectifier.by connecting capactor to all of the above mentioned ckts efficiency can be enhanced.

1. Compute the open load voltage of the current source across its shunt resistance.
2. This voltage becomes the voltage source's voltage.
3. Move the current source's shunt resistance to the voltage source's series resistance.
4. Insert the new voltage source into the original circuit in place of the current source.

Iron loss it includes the core loss is partically the same at all loads and copper loss the value of cu loss is found from short circuit test

You connect the housing of metallic electric appliances to earth ground so that, if an internal fault, such as a wire breaking loose and touching the housing, were to occur, then the housing would not become an electrocution hazard. This connection to earth ground is also accompanied with the neutral return being connected to earth ground at the distribution panel so that this internal fault causes high current in the circuit, with the result that the protective device (fuse or circuit breaker) trips.

Frequency is a function of the speed of the alternator and the number of poles. The symbol for 'hertz' is 'Hz', not'hz'.

It is always good practise to set any instrument to its highest scale when taking an initial reading, until you have established the value of the quantity being measured. Once this has been determined, the instrument can then be set to a lower scale to ensure, in the case of analogue instruments, the greatest deflection. This is because the accuracy of an instrument is greatest towards the upper end of its scale.

I would buy or build a rotary phase converter. You can build your own from a old three phase motor. Plans are available on the internet, I have built several and installed manufactured units. The rotary units seem to provide good stable three phase power and are not any trouble to maintain.

Do you need a lot of three phase power all the time or do you just have one small device to run some of the time? If you need a lot and most of the time then why not contact your local electricity supply company and get the supply changed over? This will mean paying a fee and replacing the 'consumer box' (or whatever it is called where you live) - more expensive initially but using a rotary converter could cost more in the long term as they are not 100% efficient and waste some power, also mechanical devices always fail eventually and the day it dies you have no power until you get a new one built/installed. But your best choice depends on what you are trying to do, and why.