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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 behavior of current and voltage in a series cricuit?

Kirchhoff's Current Law: The sum of the signed currents entering a node is zero. A consequence of this is that, in a series circuit every node only has two connections, one entering and one leaving, thus, in a series circuit, the current is the same at every point.

Kirchhoff's Voltage Law: The sum of the signed voltage rises going around a series circuit is zero. This means, for example, that if you have two voltage drops, such as two bulbs in series with a battery, the voltage drops across them will add up to the voltage across the battery.

Which of kichhoff's laws applies to series circuits?

Kirchoff's Current Law states that the signed sum of the currents entering a node is equal to zero. In a simple parallel circuit, say with one battery and two light bulbs, this means the current coming out of the battery will be exactly equal to the sum of the currents entering the two light bulbs. In a series circuit, it also means that the current at every point in the circuit is the same. A parallel circuit can be construed as a special case of a series circuit, when you start to combine elements.

Kirchoff's Voltage Law states that the signed sum of the voltage drops around a series circuit is equal to zero. Since a parallel circuit can be construed as a special case of a series circuit, this means that voltage across parallel nodes is equal.

How calculated the value of resistor that is to be used in particular circuit?

To read the value of a resistor:

Resistors are color coded, you can use the chart found below

And how accurate the values of resistors are is their tolerance, also found in the chart

How many microchips are in a motherboard?

It depends a lot on how many features the board has and how integrated those features are into the main chipset comprised of a northbridge and often a southbridge.

Microchip is a pretty broad term as well, which could potentially mean all ICs, integrated circuits which is the typical meaning so I will give an approximate number of 18. It will vary from motherboard to motherboard, typically in between 13 and 25.

What happens if you overcompensate with 20mF capacitor for the inductive circuit instead of 10mF capacitor which already satisfy the power factor to reach 0.95?

there would be no problem with this == == The inductive circuit has a 'lagging' power factor. If you over-compensate with too much capacitive reactance, you could go over the top (past 1.0) , and end up with a leading power factor that may even be numerically worse than when you started.

== == == ==

Are there photocells that are sensitive to laser light only?

No. Light is light.

A:

It's the wavelength that photodiodes are sensitive too. Specs vary widely, so photo emmitters have to be matched with photodiodes, or they won't 'see the light' This comes in handy when using your IR remote on a fairly bright day. If your TV could see all light, it would be blinded.

What is the Difference between noise margin and signal to noise ratio?

SNR = Signal Power / Noise Power, which is an indication of how well a receiver can distinquish a signal from random noise (non signal).

The Noise margin is the measure in Db of how much better the SNR is than the SNR required for proper operation of a receiver. To a user this may be more valuable information, since the user may not know what an acceptable SNR is for his equipment.

What is an RC filter for a ripple?

Place a capacitor across the output or load and you have your filter. This assumes that your load is a resistor. The capacitor you use depends on the frequency of the ripple. Lower frequencies require larger capacitors. A resistor may be required to make sure you do not damage any of the electronics either in series with the capacitor or immediately after the power source.

How does lightning create surge current?

A: In the sky there is potential caused by friction of particles. This is a potential to release the charge if a path is found to discharge like earth or another cloud At that time current can flow Millions of amperes will be discharged to earth for that split instance a building can rise to 1000 of volts with respect to earth ground What it means is that the POWER grid can see a rise or rather a spike on its lines which will reflect all the local distribution as surge of power.

What is meant by initial temperature rise of IC?

A: As power is turn on the temperature of the IC is at ambient temperature or the initial temperature then becomes the increase in temperature due to heating.

What a need for analyzing transistor circuits using different parameter?

At different parameters the input and output relation differs ,amplification factor varies across the various configuration of transistor. To know how to use the transistor weather as a switch or as an amplifiers analyzing it across all the parameters is important.

Difference between intrinsic and exterinsic semiconductors?

Answer An intrinsic semiconductor is a pure semiconductor. An extrinsic semiconductor is doped with trivalent of pentavalent impurities. semiconductors allow only a little amount of electricity to pass through them.they are of two types - n type and p type
Are made of the semiconductor material in its purest from

Why the windings burn when transformer is operated in DC?

Transformers are not intended to be operated in DC. DC does not provide the continuously fluctuating current that a transformer requires in order to function. On DC, a transformer will act as a transient mode inductor, and settle out to a high current state, destroying itself.

Why high value resistor used in reverse bias diode circuit?

In a reverse bias condition of a circuit current initially remains the same for low voltage but at the breakdown voltage current increases fast even for a small increase in voltage.hence.........

What is pnp resistor?

PNP stands forÊjunction transistor having an n-type semiconductorÊ setting between a p-type semiconductor as emitter and a p-type semiconductor as a collector.

Why chip more secure than magnetic strip on credit cards?

The chip contains a tiny microprocessor programmed with a unique encryption key different from all other chips. This key cannot be copied as it cannot be read out of the chip, it is only used within the chip, During the process of authorizing the transaction this microprocessor is interrogated and generates a transaction code using that key that uniquely identifies both the transaction and the card used. When the sales terminal sends that transaction code to the bank, the bank's computer can verify that the correct card was actually used.

This cannot be verified using the magnetic stripe as it can potentially be copied to any card.

What are the different types of Flip-Flops?

Types of flip flop:

  1. SR Flip-Flop
  2. Clocked SR Flip-Flop
  3. D Flip-Flop
  4. JK Flip-Flop
  5. T Flip-Flop
  6. Master-Slave Flip-Flop
  7. Edge Triggered Flip-Flop
  8. Static Flip-Flop
  9. Dynamic Flip-Flop

Why is an i used for current in ohm's law?

I or J = Latin: influare or international ampere.

Another source gives the origin of the I as being from the German word for Intensity.