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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
In a circuit the voltage across all resistores is the same?
It depends upon the connection of the resistors, if the resistors are connected in parallel then the voltage is same where as in case of resistors connected in series the voltage is different across different resistors.
How do you determine the value of a burnt resistor?
Carefully scrap the insulating material off along a straight line on the resistor body using a pen knife until you can see the spiral track of the resistive material.
Chances are you can still measure some resistance, using either end of the connection lead and a pointed pin, pricking at the spiral track.
Starts from one end and advance on each spiral track until you have found an open circuit. Record the resistance before this happens. Do the other end using the same method.
Add the resistance found in both cases and adds 10% more. This will give you the approximate resistance of the original resistor.
This method often works because resistor burns open in one spot only.
Why does the output wave shape give spike voltage in push pull inverter?
Due to inductance there is a spike in output voltage
Can electrical tester be used for testing both dc and ac?
AC, when you're going to test a product which cannot tolerated the power source in your home. ex. in testing a 15A bulb, you cannot test it directy to the wall plug in your home instead you use AC tester(alternate current) to convert the supply to its limit or else it will fry your bulb. DC(direct current), when you're testing a high voltage product and it can tolerated the power source from your wall plug.
What is the difference between potential difference and current?
think of potential as pressure and current as flow. you can have pressure in a water hose with out flow. open the valve and current happens.
The difference in potential divided by the impedance is equal the current.
If the two resistors are in series, then the larger one is 2 ohms.
(The smaller one is 1 ohm. Their combined series total is 3 ohms. 9/3 = 3 amps.)
If the two resistors are in parallel, then the larger one is 9 ohms.
(The smaller one is 4.5 ohms. The combined parallel total is 3 ohms. 9/3 = 3 amps.)
There is no "the" weather radar. Weather radars are a class of radars which can be used for gathering data on weather conditions.
refer: http://en.wikipedia.org/wiki/Weather_radar
The most commonly used weather radar at the moment is Pulse Doppler Radar. There was no 1 inventor of the PDR, so it was likely developed either by corporations or research labs. Refer to http://en.wikipedia.org/wiki/Doppler_radar#History for discussion on the origins of the more basic Doppler Radar.
Why are digital systems capable of greater accuracy than analog system?
- Greater possible accuracy
- No drift
- No temperature sensitivity
- Reduced noise
- No aging problems
- Easier to change if needed
However where speed of response is critical the analog control system may be preferred over digital.
How do you change rotation on a Century AC motor?
There are two alternate methods depending on whether the motor is single phase or three phase. On a single phase motor, reverse either the start winding coil lead or the run winding coil lead but not both. This action will reverse the motor's rotation. On a three phase motor, interchanging any two of the three coil leads will reverse the motor's rotation.
What is the job of a bulb in a circuit?
The job of the bulb in a circuit is to convert electrical energy to light. It's called the load in the circuit.
How do you reduce 13.9 dc to 12 volts dc?
Nowadays, you can buy DC to DC convertors that do the conversion in a single module.
A cheaper solution, however, would be to use a chain of diodes - each diode will drop 0.7 volts so 4 diodes will drop 2.8 volts, reducing 12 volts to 9.2 volts.
Why in 4 diode full wave rectification you use bridge?
bridge is use in 4 diode fullwave rectification to allow complete cycle so that there will an output DC for both the positive and ndgative half-cycle of the input AC.
Will amplitude modulated waves go more distance or frequency modulated waves?
The method of modulation has very little to do with the distance traveled, this is more dependent upon the frequency of the carrier. As the frequency gets higher the wave takes on more and more the characteristics of light. For example microwaves need to have the receiving dishes (antennae) in line of site with the transmitter.
In practical circumstances it appears the AM travels further but that is only because AM broadcasts at lower frequencies (typically 526KHz to 1625KHz) (MF) and FM at higher frequencies (typically 88MHz to 108MHz)(VHF)
What is the majority carrier in an n type semiconductor?
p-type majority carriers are holes
n-type majority carriers are electrons
What are the Applications of XOR?
Exclusive OR gate has a variety of applications.
Even parity generator.
comparator.
encoder etc.
What happens to the voltage of a series circuit as you add bulbs to the circuit?
For any lamp to operate at its rated power, it must be subject to its rated voltage. If you connect, say, three identical 120-V rated lamps across a 120-V supply, then each lamp will be subject to one-third of its rated voltage. As a result each lamp will not be able to achieve its rated power. If the lamps have different power ratings, then it is rather more complicated, with the most powerful lamp becoming the dimmest while the least powerful lamp becoming the brightest.
Which scientist did experiments involing a form of cathode ray tube?
J.J. Thomson used cathode ray tubes to prove the existence of electrons.
Where was ohm's law discovered?
The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire. He presented a slightly more complex equation to explain his experimental results. The above equation is the modern form of Ohm's law.
Law that states that, for many materials over a wide range of conditions, the current flowing in a conductor maintained at constant temperature is directly proportional to the potential difference (voltage) between its ends
Why diode acts as insulator in reverse biasing?
a diode has two junctions one is doped with p-type and another is doped with n-type.a diode connected in reverse bias means that the n-channel is connected to the positive end of the battery and p-channel is attached to the negative end of the battery
if we start increasing the reverse voltage the width of depletion region increases and the exchange of charge carriers (holes and electrons) is inhibited so we expect zero current in the circuit but on experimental observations we had confirmed that a small current (micro-amp) is observed due to the minority charge carriers(electrons in p-channel and holes in n-channel) present in the diode , for these minority charge carriers the applied voltage appers as as forward bias to them so they conduct .
but on further increasing the reverse voltage we note a large change in the reverse current this is due to junction breakdown (the depletion region is broken , so there is no demarcation between p-channel and n-channel in the diode). the voltage at which this phenomena occurs is called 'break-down voltage'
What is meant by non linear circuits?
A nonlinear component is one in which the current is not proportional to the voltage, in other words it does not follow Ohm's law.
The commonest nonlinear component is a diode.
A nonlinear circuit is one with a nonlinear component in it.
What is the resistor of 18 ohms when connected to a 9v battery?
Even though it is connected to a 9 volt source, it is still a resistor.
A thyristor is a rectifier semiconductor between two electrodes that permit unidirectional flow in anodes and cathodes.The flow of the current can be switched by a gate electrode that controls main driven electrical devices.To check a thyristor the current flow (between emitter/collector terminals) is checked.Then a small base current is applied to see if the thyristor functions as a switch.
Are radio waves a form of sound or light?
When you listen to the radio, you are hearing sound, which has no resemblance
to light, radio waves, or x-rays. However, the sounds you hear are created in
the radio receiver, using information that was carried to your location by means
of radio waves.
