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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
How would you connect a resistor in order to reduce an LED's applied voltage?
You could use the voltage divider rule to reduce the voltage. Using two resistors in series, the input voltage will drop across each resistor by an amount that is proportionate to the values of the resistors.
If the 1st resistor is 10K and the 2nd resistor is 100K, the voltage drop across the 10K will be 10 times LESS than that of the 100K resistor. The total voltage drop across both resistors will be equal to the supplied input voltage.
Work out the ratio of voltage you need from the total input voltage and use 2 resistors will that give you the same ratio. Connect the LEDs in parallel with the resistor the gives you the voltage you want. Use a MM to measure the voltage across the resistor before wiring LEDs.
What does the label uA and mA mean?
uA, means Micro-Amp or 1 millionth of an Ampere
mA, means milli-Amp or 1 thousandth of an Ampere.
An Ampere is a unit measurement of electric current flowing in a circuit.
15 watt load battery 20 ampere-hour how much time battery used?
Assuming your battery supplies a constant and exact voltage of 12VDC, then your 15 watt load will draw 15 W / 12 V = 1.25 A. Your battery can provide 20Ah, so you'll drain it in 20Ah/1.25A = 16h. Note these are only theoretical values; a real battery doesn't behave like that. The voltage is likely to be higher than 12VDC on a fully charged battery (more like 13..14VDC in a typical car battery, for example), and the voltage will drop over the discharge. Just how the voltage drops (how fast, how low) is a function of the battery (design, quality, age) and environment (temperature, possibly altitude).
What is a signal generator for a speedometer?
if the speedometer works off of an input wave (sinusoidal signal) you would think the signal generator would be a source of reference
What is meant by frequency of 0.1 khz?
It means that the wave (or Object) in reference is repeating itself with the rate of 100 Cycles (or times) per second.
IB=IE-IC
=100uA
TPMOV is abbreviated name, its full name is thermally protected MOV. And the MOV is also abbreviated name, its full name is metal oxide varistor. TPMOV is a combination of thermal link and a MOV inside a small package. It can avoid the fire caused by MOV's failure.
There are some similar names such as TMOV or iTMOV, same as TPMOV. Famous manufacturers such as Littelfuse, Ferraz Shawmut, Epcos, SETfuse and etc.
The applicable standards include UL1449 3rd, IEC61643-331, IEC61052 and etc.
What crrent does a 203-ohm resistor draw from a 115 V power supply?
Ohm's law: current equals voltage divided by resistance, so a 203 ohm resistor would draw 0.57 amperes from a 115 volt power supply.
Where do you buy analog to digital converters for tv?
Most big electronics stores (such as Dixons, Comet, Currys etc) sell digi-boxes. You can even buy them on -line from Amazon or eBay.
Which conductor size has the largest diameter?
The largest conductor listed in the National Electrical Code is a 2000 kcmil.
250 mA = 0.25 Ampere = 0.25 coulomb per second.
(0.25 coulomb/second) x (60 sec/minute) x (30 minutes) = 450 coulombs
Where can one find more information on embedded system design?
There are many places where one may find out more about embedded system design. Once can look at Wikipedia for a simple definition, and then read blogs or as in forums for further information.
What is a Man Machine Interface MMI?
Point at which a user interacts with a machine or equipment being used.
What is the external data memory capacity of 8051 and why?
65536 bytes, because the 8051 family has a 16 bit external address buss.
What are the majority and minority current carriers in an N-type and a P-type semiconductor?
In an N-type semiconductor, majority current carriers are electrons, while minority current carriers are holes. In a P-type semiconductor, majority current carriers are holes, while minority current carriers are electrons.
Whats the difference between analog and digital signal?
Analog signals are continuous while digital signals are discrete
Dual trace oscilloscope along with block diagram?
in the dual trace cro the same electron beam is used to generate the two traces that can be deflected from two independent vertical source
The signal trace capability of the conventional CRT can be modified to produce dual image or dual trace display, by means of fast electronic switching of two separate input signals. Channel A and Channel B with preamplifier and delay lines feed their input to an electronic switch that alternately connects the input of the main vertical amplifier to the two signal inputs. The same are displayed with various display modes.
When the display mode selector is in the alternate position, the electronic switch alternately connects vertical amplifier to channel A & B. The switching rate is synchronized to the sweep rate, so that CRT spot traces channel A signal on one sweep and channel B on next. Since these signals have calibrated input attenuator and a vertical position control, the amplitudes of the input signal can be adjusted individually and the two images placed separately on the screen. This mode is useful with fast sweep rates, when the two images appear as one simultaneous and state display.
In chopped mode electronic switch is free running at the rate of 100 to 500 kHz, entirely independent of the frequency of the sweep generator. In this, switch successively connects small segments of A and B waveforms to the main amplifier. At fast chopping rate of 500 kHz, or say 1 microsecond, sweep of each waveform is fed to CRT for display. If the chopping rate is much faster than the sweep rate, the individual segments reconstitute the original A and B waveforms on screen without interruptions in the two images. If sweep rate approaches the chopping rate, the segments' waveforms become visible as individual images and the continuity of image display is lost, which is less picturesque than the alternate mode of position.
The use of polarity inversion switches can display A+B, A-B, B-A, and -A-B modes.
In the X-Y mode the sweep generator disconnects channel B and is connected to the horizontal amplifier. This gives good X-Y measurements with same amplifications. In addition the dual trace CRO can be used as single beam CRO, displaying either A or B as a function of time.
How do you protect switch contacts from welding closed?
I ran into this trick over 30 years ago. First make sure the power source is off and then put a very thin coating of vaseline on the contacts. This won't stop the welding alltogether, but it'll slow the occurance way down.
A: A GRID is a like a cross patch where there are many points of entry and when two point intersect that point will be unique and a address can be given.
Effect of the capacitor to the low frequency waveform?
The differential equation for a capacitor is dv/dt = i/c. Set that up in a circuit and force an AC power source, such as sin(theta), and you will see that lowering the frequency will increase the equivalent resistance. I'll leave that exercise for you. The net result is that a series capacitor is a high-pass filter, while a parallel capacitor is a low-pass filter.
Which will last longer eight 6 volt batteries or four 12 volt batteries?
That would depend on the capacity of the battery, usually measured in Amp-Hours (Ah). 4 12 volt batteries with a capacity of 10 Ah would last the same amount of time that 8 6 volt batteries of 10 Ah would last. There are however other factors that could contribute to the length of time they last, mostly to do with the construction of the cell and how much current it is designed to pass. 6 volt batteries are typically smaller in stature and as a result may not be able to produce large amounts of current as a 12 volt battery of the same current rating without getting hot...and heat = lost energy, unless it involves a toaster.
What are the uses of power system stabilizer?
PSS is a part of AVR in the form of an algorithm which detects and helps in damping of power system oscillations.
Why is sma welding current referred to as constant current?
because the current is regulated rather than the voltage
all the motions are controlled by movement that has been programmed.
you cant see whats going on with the arc so to make adjustments you have to reprogram the motion after you stop and see what happened.
perhaps you can set it for constant voltage and get better results.
perhaps constant voltage is better for different materials.
most smaller wire feeds are constant voltage which tends to keep the arc length constant.
the operator can watch what he doing if he can see the arc and can make all manner of small adjustments. without reprogramming the controls.
stick welding is possible because you can watch what you are doing to keep arc length constant the machines are almost always constant current
