Electronics Engineering

A series DC motor can be thought of as having two components, the rotor and the stator. The rotor has windings which rotate and the stator's windings stay stationary. In a series DC motor these windings are connected in series. To make the motor turn backwards you must reverse the current through either the rotor or stator windings, but not both.

farad is the unit for capacitance in SI system. If one volt is developed as one coulomb charge is placed then capacitance has to be one farad.

But one farad is enormous large one so practically speaking we use only micro farad, nano farad and pico farad. They are respectively 10-6 F, 10-9 F and 10-12 F

A differential amplifier will amplify the difference between 2 signals. This is useful in control systems, where one signal can represent what is actually happening (could be a position or speed, for example). The other signal can represent what is desired.

A differential amplifier could be used in a cruise control on a car. When you set the cruise control, a voltage level can represent the speed that the car was traveling when set. If the car starts going up a hill and slows down, the voltage difference would be amplified, and the output of the differential amplifier can be sent to an actuator, which moves a lever to increase the rate of fuel going to the engine. When you get back to the desired speed, the difference is zero, and the actuator stops moving. If your speed increases too much, then it would have a negative voltage, so the actuator would move the other way, decreasing the rate of fuel to the engine.

A: Actually it is only one transistor required for amplification the other junction can be a diode. As current Begin to flow it causes a bias across one junction which is opposite biasing for the other, A good differential amplifier will have those junction virtually at the same point with a very good current source because any mismatched will cause and output without any input. It is called voltage offset on the other end if the feedback current is very small it will also produce an output voltage offset known as current offset or basically errors

Main memory is the storage that is directly available to the CPU of a computer and is made3 up of RAM and ROM. RAM's (Random Access Memory) purpose is to hold the data and instructions temporarily which the CPU will process. ROM's (Read Only Memory) function is to hold data necessary for starting up the computer permanently , whose contents cannot be changed by the user.

The a.c. component, or ripple, produced by the 4-diode (full wave) bridge rectifier is the same as that produced by the 2-diode full wave rectifier.

The bridge is connected across the secondary winding of a transformer.

The 2 diodes of the other type of full wave rectifier are each connected to one end of a winding, but that winding requires a center tap.

For any desired value of d.c. after rectification, the a.c. voltage of the 2-diode rectifier winding has to be twice that of the winding required for the bridge.

conductors are made up in such a way that the electricity can pass through them easily.

The materials of the conductors may be copper, gold, aluminium, gold, silver, water etc..,

Since the base in an n-p-n transistor is kept very thin, very few electrons get to recombine with holes and escape out of base, most of the electrons are injected from emitter into the collector. As a result, Base-current is very small. Whereas the Collector-current is almost equal to the Emitter-current.

One of the advantages is thereâ??s minimal loss of analog data and can easily be converted to digital data. The disadvantage is it is sensitive to temperatures and acceleration.

You can reduce the voltage fluctuations by first determining what is causing them, then counteracting this cause. In small circuit designs with multiple switching amplifier and ICs, the power or ground lines may become noisy due to this switching. Placing capacitors at the ICs power and ground can reduce this to manageable levels in most cases. Sometimes it can become necessary to isolate specific circuit's power and ground from the system using small inductors as well. If you are designing a power supply, zener diodes, and isolated power outputs (at the same or different voltages) can be used.

* Digital signals suffer less interferences than analogue signals. This means that when you listen to a digital signal you won't hear a hissing sound, as within digital signals regenerator circuits are used to clean "noisy" pulses. * Digital signals can be made very short so more pulses can be carried around each second, which means more information can be passed on.

1 sq..mm have max. capacity is 10 ampere if these are of copper approximately than 120 sq..mm having current carrying capacity is 1200 ampere

by increasing the emitter current

R=V/i

That is 1000 ohm.

Semiconductors: When temperature increases, more electrons jump to conduction band from valance bond. Hence resistance decreases.

Metals: Already plenty of electrons are there in conduction band. When temperature increases, the electrons in conduction band of metal vibrate and collide each other during their journey. Hence the the resistance of metal increases with increase of temperature.

S.Lakshminarayana

Most devices, including the Electronic ones, will eventually wear out. The fact that Electronic Devices do not seem to have moving parts ignores the fact that Electricity is the main moving part in the device. The more complex the device then the more things in it that do wear out or break faster

The worlds first colour television broadcast took place on January 1st 1954.

Actually, not quite the question. Colour television (using a rotating disc fitted with coloured filters) was demonstrated by John Logie Baird to RCA in 1939. His first 'proper' colour television system was demonstrated in 1944.

Voltage dividers are used in a linear circuit to separate the input voltage into a small portion known as the output voltage. It is commonly used to get a low voltage signal equal to the voltage being measured.

Yes, an inductor allows DC to pass through it.

An inductor resists a change in current, proportional to inductance and voltage. At equilibirum, an ideal inductor has zero impedance.

The differential equation for an inductor is di/dt = v / l

Voltage is an electrical force or pressure that causes current to flow in a circuit. It is an additive in a series circuit.

The higher voltage source forces current backwards into the lower voltage source, which can damage it or even cause it to explode.

The load current will lag the supply voltage by an angle called a 'phase angle', determined by the values of resistance and inductive reactance. The magnitude of the load current will be determined by the impedance of the circuit, which is the vector sum of the resistance and inductive reactance.

The typical ohmmeter measures DC resistance by providing DC current and measuring the voltage drop accross the resistor. By definition, the 'ideal' capacitor is an open circuit to DC current and voltage. By definition, an open circuit has infinite resistance.

Of course, real-world capacitors are not ideal. They have a very high parallel leakage resistance and a very small series resistance. And, different meters can measure different ranges of resistance. So, you may not get an infinite/overload measurement on some capacitors with some meters. You may get a very high resistance instead. If so, you are not really measuring the resistance of the 'capacitor', but rather that of the imperfections in the component manufactured to be a capacitor.

ANSWER: The ohmmeter battery will charge the capacitor in 5 time RC after that it quirts there is no more current flow. Any body that claim to be able to check resistance of a capacitor i just a wannabe

A transformer is the device used to increase or decrease the voltage of alternating current (AC) This is done through a process referred to as inducing.
It's operation is based on the fact that electricity produces a magnetic field around itself. By placing 2 coils of cable beside each other, the magnetic field of one coil will induce a voltage in the other coil.