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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
What is the reason for overheating in transformer?
The main reason that a transformer overheats is too much current for the transformer design. So my guess is that you have more load than the transformer was designed for. So my answer would be not powerful enough.
You are not actually worried about the "power" of the device. You could use a 15 amp power supply on a device that needed a .015 amp load.
What you are REALLY waning to make sure of is that the desired voltage is matched. A 12 volt D.C. supply should only be used with systems that need 12 volts D.C. To use anything else causes issues. Too low of a voltage gives you brown out issues and too high of a voltage could cause you to draw so much current you burn the device up.
When does an electromagnet produce a magnetic field?
A magnetic field is generated whenever a current is passing through a wire.
What is the difference between 8051 and 8086?
8051: 16 bit Microcontroller
on chip ROM( 8KB) and On chip RAM (128 bytes)
two 16 bit timer/counter.
four 8-bit ports for input/output
fully duplex serial receiver/transmitter.
no prefetching of instruction.
16 address pins
8086: 16 bit Microprocessor
No on chip memory.
memory is divided into two banks to increase the processing speed.
prefetching of 6 bytes of instruction in a queue.
20 address pins
What are the outputs of sequential logic a function of?
your mom says stop cheating on your homework
love sammyboy
How is zener diode different from p-n junction diode?
A p-n junction diode is made of a crystal of semiconductor. Impurities are added to it to create a region on one side that contains negative charge carriers (electrons), called n-type semiconductor, and a region on the other side that contains positive charge carriers (holes), called p-type semiconductor.
A Zener diode contains a heavily doped pn junction allowing electrons to tunnel from the valence band of the p-type material to the conduction band of the n-type material. A reverse biased Zener diode will exhibit a controlled breakdown and let the current flow to keep the voltage across the Zener diode at the Zener voltage.
What is the minimum distance to live near high voltage cables?
Technically, the intensity of the electromagnetic fields radiated from electrical transmission lines becomes smaller as the distance from the cable increases, but it never reaches zero. Despite many studies made on the effects of magnetic fields, there is no definitive guide as to what harmful effects high voltage fields have on humans or other living things. The level of risk in being exposed to these fields cannot be categorically stated.
How do the electrons move through the positive and the negative terminal in a light bulb?
Electrons move across the terminals of a filament in a light bulb in one direction for 1/120th of a second, and they move in the opposite direction for the next 1/120th of a second. Yes, electrons through a light bulb flip direction 120 times every second.
When you should use synchronous motor instead of capacitor for power factor correction?
Synchronous motors show some interesting properties, which finds applications in power factor correction. The synchronous motor can be run at lagging, unity or leading power factor. The control is with the field excitation, as described below:
- When the field excitation voltage is decreased, the motor runs in lagging power factor. The power factor by which the motor lags varies directly with the drop in excitation voltage. This condition is called under-excitation.
- When the field excitation voltage is made equal to the rated voltage, the motor runs at unity power factor.
- When the field excitation voltage is increased above the rated voltage, the motor runs at leading power factor. And the power factor by which the motor leads varies directly with the increase in field excitation voltage. This condition is called over-excitation.
- The most basic property of sycho motor is that it can be use as a CAPACITOR OR INDUCTOR both. Hence in turn it improves the power factor of system.
The leading power factor operation of synchronous motor finds application in power factor correction. Normally, all the loads connected to the power supply grid run in lagging power factor, which increases reactive power consumption in the grid, thus contributing to additional losses. In such cases, a synchronous motor with no load is connected to the grid and is run over-excited, so that the leading power factor created by synchronous motor compensates the existing lagging power factor in the grid and the overall power factor is brought close to 1 (unity power factor). If unity power factor is maintained in a grid, reactive power losses diminish to zero, increasing the efficiency of the grid. This operation of synchronous motor in over-excited mode to correct the power factor is sometimes called as Synchronous_condenser.
What happens when you add a resistor to a series circuit with a light bulb?
As you add more bulbs to a series circuit that means that the bulbs are in series to one another, therefore the total resistance is the sum of the individual resistance of the bulbs. If you add bulbs of the same resistance,then the rate at which the resistance changes will increase in a constant manner provided the current source is not altered. For instance if the bulb you are using is rated 20v,60w, then the current passing via the bulbs in series is the square of the voltage divided by the power in this case the current is approximately 7amperes.
How many resistors does a circuit diagram have?
The number of resistors in a circuit diagram can vary widely depending on the complexity of the circuit. A simple circuit may have just one or two resistors, while more complex circuits can have many, potentially dozens or even hundreds. The exact number is indicated in the specific circuit diagram being referenced. To determine the count, one would need to closely examine that diagram.
Intrinsic and internal motivation is the same?
The Factors That Promote Intrinsic Motivation.Factor Description Related GuidelinesChallenge People are best motivated when they are working toward personally meaningful goals whose attainment requires activity at a continuously optimal (intermediate) level of difficulty. # Set personally meaningful goals. # Make attainment of goals probable but uncertain. # Give enroute performance feedback. # Relate goals to learners' self esteem. Curiosity Something in the physical environment attracts the learner's attention or there is an optimal level of discrepancy between present knowledge or skills and what these could be if the learner engaged in some activity. # Stimulate sensory curiosity by making abrupt changes that will be perceived by the senses. # Stimulate cognitive curiosity by making a person wonder about something (i.e., stimulate the learner's interest). Control People have a basic tendency to want to control what happens to them. # Make clear the cause-and-effect relationships between what students are doing and things that happen in real life. # Enable the learners to believe that their work will lead to powerful effects. # Allow learners to freely choose what they want to learn and how they will learn it. Fantasy Learners use mental images of things and situations that are not actually present to stimulate their behavior. # Make a game out of learning. # Help learners imagine themselves using the learned information in real- life settings. # Make the fantasies intrinsic rather than extrinsic. Competition Learners feel satisfaction by comparing their performance favorably to that of others. # Competition occurs naturally as well as artificially. # Competition is more important for some people than for others. # People who lose at competition often suffer more than the winners profit. # Competition sometimes reduces the urge to be helpful to other learners. Cooperation Learners feel satisfaction by helping others achieve their goals. # Cooperation occurs naturally as well as artificially. # Cooperation is more important for some people than for others. # Cooperation is a useful real-life skill. # Cooperation requires and develops interpersonal skills. Recognition Learners feel satisfaction when others recognize and appreciate their accomplishments. # Recognition requires that the process or product or some other result of the learning activity be visible. # Recognition differs from competition in that it does not involve a comparison with the performance of someone else.
What is the function of capacitor in full wave rectifier with smoothing capacitor circuit?
is a device that smoothen your half-wave rectification into a full-wave rectification after using a 4 diode and 1 resistor , after adding a capacitor , there will be a almost steady output , it charges the capacitor when is forward biased which is the first half wave , and discharge when is reverse biased to stablelize the wave into a almost same potential difference compare to a.c
How does the earth wire protect you from a short circuit?
An earth wire only " works " under fault conditions in an electrical circuit . The earth or circuit protective conductor protects any conductive part of the system which under normal conditions should not be live , for example the metal casing of a washing machine . The earth , during a short circuit , will complete the circuit and the system will fuse/trip/disconnect if protected suitably .
Why is it important for the switch of the circuit to be open at the start of an activity?
If you mean by activity, working on an electrical circuit, then it is for safety reasons that a switch is opened. Most companies now use a proper lock out procedure so that everyone is aware that the circuit has been locked out. If more than one person is working on the circuit each person is required to have their own personal lock on the open switch.
What products have resistors in them?
resistors are commonly found in electronic devices. a resistor is any material, through inductive reactance or capacitive reactance,which opposes a current. typically by creating a magnetic field or an inverse voltage.
Why antenna height is at least quarter wavelength for radiating from it?
A transmitter antenna is a tuned circuit and it can be very complex and it even get more difficult at higher frequencies, if it's not a 1/4 wave length of the transmitter frequency it is un tuned and you will have some of your RF power radiated back to the transmitter, that is called SWR, for Standing Wave Ratio and it will damp the RF that is radiated from the antenna and if the SWR is to high it can damage the transmitters final stage. It don't have to be the real physical 1/4 or 1/2 wave and it can even be 5/8 of the wavelength but then a L/C circuit have to be inserted at the input side of the antenna to tune the antenna to the correct frequency one antenna can even be used for two different frequencies, then a L/C tuning circuit have to inserted at a 1/4 wave length of the higher frequency , this type of antenna is used in duplex systems, like a cell phone.
What is a TTL-compatible output?
Compatibility in TTL means that the output of one TTL device can be used to drive the Input of the other TTL device , This because the low and high output window fit inside the low and high input window/profile
TTL stand for Transistor Transistor Logic, so any voltage between 0 and 5 volt is compatible where any voltage between 3V and 5V is logic 1 and zero volt is logic 0
What the examples of closed loop theory in football?
After the memory trace has triggered a response, internal feedback is gathered through kinaesthesis and propriorception during the execution. As the loop is small it allows quick subconscious corrections to take place. In regards to a slalom skier, they will make quick adjustments to retain balance andn speed whilst going downhill.
How drain current is controlled in JFET?
The gate voltage controls the extent of depletion layer and thereby controls the width of the channel. As the width of the channel varies, current also varies. Width of the channel is inversly proportional to drain current.
Where does a SCR differ from a power transistor in operation?
thyristor can be scr or triac
scr is strictly dc
a triac is back to back scr's with a common gate
two scr's back to back can be gated independently
scrs cost less than triacs
an scr can be combined with a full wave bridge to make an equivalent to a triac
but this gives an additional 1.5V forward voltage drop
What is a current voltage and resistance?
Many people find the following analogy useful. Instead of a wire, think of a garden hose. Instead of current, think of water flowing through the hose. Instead of voltage, think of water pressure. And instead of resistance, think of either a crimp in the hose or a narrow section of hose that restricts water flow. After you get your brain around that idea, consider Ohm's Law, which is the most fundamental rule in the study of electricity. Ohm's Law is simply: V = IR, where V = voltage, I = current, and R = resistance. Ohm's Law can be stated in two other ways: I = V/R and R = V/I.
Advantages of at89c51 microcontroller over 8051 microcontroller?
the 8051 microcontrroller is the name doesnt matter easy or not....but the maiin and imp diff between both is at89s51 represents the 8051 chip no....along with the name of company i.e atmel, so all n all both are same thing ......
89c51 have RISC architecture and contains less no of opcodes which are easy for programming. so iti is preferred than 8051.
