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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 Intrinsic Impedance?

intrinsic impedance is ratio of E/H from a uniform plane ve in a materal

Why we use resistance?

the resitance would be used to reduce a voltage amplitude to a level suitable to be used in an application, to limit the amount of current flowing within the circuit , or in some cases the resistor

could be used as a heating - effect.

Can we use a fluorescent lamp in DC?

Yes, fluorescent lamps may be powered by DC but they need a DC lamp controller instead of an AC ballast and starter. The DC lamp controller is more complex.

I have a 12V lantern with fluorescent lamp tubes.

What is maximum power rating?

Maximum power rating describes the maximum power at which a device can operate without reaching an excessive temperature. For example, in the case of a resistor, if its maximum power rating is exceeded, then it may burn out.

Can the total of the voltage drops across the loads of a series circuit ever exceed the total of the source voltages applied to that circuit?

No. But bear in mind that, in the case of a.c. circuits, 'total', means the phasor (vectorial) sum of the voltage drops, NOT the algebraic sum.

Why emitter is always forward biased with respect to base?

It is because the emitter is the source of charge carriers and we require to move these charge carriers into base which is obtained only by forward baising the base emitter junction.

Why the armature current of a shunt motor decreases as the motor accelerates?

Without a mechanical load the motor accelerates until the back-emf generated by the armature nearly equals the supply voltage. On load, the speed drops and the current rises until the power taken from the supply balances the mechanical power supplied to the load.

If the armature has low resistance, the speed drop under load is not very much, so speed regulation is better if the armature resistance is lower.

How are analog signals transmitted-?

Analog signals are transmitted as electrical waves.

Why is resistance more in parallel combination?

Resistors in parallel have a LOWER combined resistance than either alone, not a higher one.

As part of your resistance posture you should portray at all times.?

Leaving evidence of your presence supports U.S. Government effort to locate, identify and recover you.

How do you recognise the values and identify polarity and any other orientation requirements for all electronic components being used in the assemblies?

If there’s enough room on the capacitor, most manufacturers of electronics components print the capacitance directly on the capacitor along with other information such as the working voltage and perhaps the tolerance. However, small capacitors don’t have enough room for all that. Many capacitor manufacturers use a shorthand notation to indicate capacitance on small caps.

If you have a capacitor that has nothing other than a three-digit number printed on it, the third digit represents the number of zeros to add to the end of the first two digits. The resulting number is the capacitance in pF. For example, 101 represents 100 pF: the digits 10 followed by one additional zero.

If there are only two digits listed, the number is simply the capacitance in pF. Thus, the digits 22 indicate a 22 pF capacitor.

This shows how some common capacitor values are represented using this notation:

Marking Capacitance (pF) Capacitance (ìF)

101 100 pF 0.0001 ìF

221 220 pF 0.00022 ìF

471 470 pF 0.00047 ìF

102 1,000 pF 0.001 ìF

222 2,200 pF 0.0022 ìF

472 4,700 pF 0.0047 ìF

103 10,000 pF 0.01 ìF

223 22,000 pF 0.022 ìF

473 47,000 pF 0.047 ìF

104 100,000 pF 0.1 ìF

224 220,000 pF 0.22 ìF

474 470,000 pF 0.47 ìF

105 1,000,000 pF 1 ìF

225 2,200,000 pF 2.2 ìF

475 4,700,000 pF 4.7 ìF

You may also see a letter printed on the capacitor to indicate the tolerance. You can interpret the tolerance letter as follows:

Letter Tolerance

A ±0.05 pF

B ±0.1 pF

C ±0.25 pF

D ±0.5 pF

E ±0.5%

F ±1%

G ±2%

H ±3%

J ±5 %

K ±10%

L ±15%

M ±20%

N ±30%

P –0%, + 100%

S –20%, + 50%

W –0%, + 200%

X –20%, + 40%

Z –20%, + 80%

Notice that the tolerances for codes P through Z are a little odd. For codes P and W, the manufacturer promises that the capacitance will be no less than the stated value but may be as much as 100% or 200% over the stated value.

For codes S, X, and Z, the actual capacitance may be as much as 20% below the stated value or as much as 50%, 40%, or 80% over the stated value. For example, if the marking is 101P, the actual capacitance is no less than 100 pF but may be as much as 200 pF. If the marking is 101Z, the capacitance is between 80 pF and 180 pF.

What is the inference of instrument amplifier?

The differential voltage is amplified using the instrumentation amplifier.This is the inference we know from instrumentation amplifier...

What happens to a transformer when it is first connected to a power line Can anything be done to mitigate this problem?

If rating is correct, terminal connections are correct, if safety devices are in place, if device is a standard with necessary requrement, it should not be problem to connect a transformer first time.

Is the graphical analog of a frequency table?

A) histogram

B) scatter plot

C) time series plot

D) contingency table

The Answer is "A" it's a Histogram

A bar chart is a graphical representation of data. A frequency table is a table of numbers, which breaks numbers into various groups, based on how often values occurs within ranges.

How much voltage is required to run 0.054 a of current through a 15 resistor?

0.81 V - just answered the other answer to this question (2.8 x 10^2V) and got it wrong

What are Common musical parameters?

Tempo, key signature, and rhythm (Number of 1/4 notes per measure)