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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 inductance is produced when electric current passes through a conductor?
Electric charges interact with changing magnetic fields. All magnetic field changes can be thought of as the magnetic field moving. If the magnetic field strength is increasing then it is the same as a magnet being brought nearer while a decreasing magnetic field is the same as if a magnet is being pulled away.
The force a charge experiences is the result of several factors. The direction of the force depends on the polarity of the charge, whether it is positive or negative, the direction of the magnetic field and the direction of relative motion between the charge and magnetic field. The magnitude of the force, its strength, depends upon the amount of charge, the strength of the magnetic field and the speed of the relative motion between them.
So you can make charges inside a piece of wire move by waving a magnet near the wire. If the wire makes a circuit, then you get electric current flowing through that circuit. A generator is a device which uses the interaction between charges and changing magnetic fields to create electric current. Generators require a source of mechanical energy to run. Portable generators typically use gasoline while generators used by the electric power company can be driven by water, wind, coal, natural gas or the heat from nuclear fission. Coal is the most common source of energy for electricity in the United States.
Transmission from a satellite to an earth-based station?
with help receiver, encoder, modulator, up converter, hpa, LNB...etc.
It could act as one when the circuit is closed, but when the circuit is open, I believe you would define the air as the thing resisting current. In basic circuit problems the switch usually doesn't have any resistance of its own (ie as negligible as the resistance in a wire, so it is ignored).
How can calculate the current of 3 resistors wired in parallel?
In this case, to get the equivalent resistance, first you use the parallel formula (1/R = 1/R1 + 1/R2) to calculate the equivalent resistors in parallel. Then you calculate the series resistance of this combination, with the other resistor.
They are RCA type connectors on the back of your Head Unit (Radio). There are 2 connections, usually blue and white, the cord for this has the same connectors on both ends. The Pre-Amp outputs are a direct line for the Signal from your Head Unit to go directly to an Amplifier (you will see similar connections on your Amplifier as you see on the back of your Head Unit), so when you run speaker wire from your Amplifier, the speakers will play the sound (Music) your Head Unit is producing no matter if its from the CD or FM/AM tuner or AUX input like from an I-Pod.
Another Answer
A pre-amplifier, which is also known as a 'control unit', a high-fidelity unit which is separate from, but which must be used together with, a 'power amplifier'.
Pre-amplifier/power amplifier units are normally regarded as 'high end' equipment and tend to be very expensive. The pre-amplifier unit is equipped with inputs for phono, CD-player, tuner, and various other auxiliary units and (usually) provides a single pair (right- and left-channels) audio outputs for connection to the power amplifier. The pre-amplifier is the unit which provides the volume control, tone controls, filters, etc., while the power amplifier simply amplifies the output from the pre-amplifier unit. The output usually takes the form of a pair of RCA connectors, usually colour coded white and red.
Some 'home theatre' amplifiers provide a 'pre-amplifier' output, which bypasses its internal power amplifier, for the purpose of adding external power amplifiers, if desired.
Does a standard multimeter measure ac in peak or peak to peak?
Neither. A.C. voltage, and current, are expressed as root-mean-square (rms) values, and this is what a voltmeter and an ammeter reading will indicate. To measure peak voltage, or peak-to-peak voltage, you will need to use an oscilloscope.
How much resistance is in the circuit if it uses a current of 10ma?
Just use Ohms Law: V=IR, that is, voltage (in Volt) = current (in Ampere) x resistance (in Ohms).
What are the disadvantages in using a series circuit?
Series:
It is impossible to control the bulbs individually. This is one reason that series circuits are not practical for use in home lighting: It is not possible to control the lights in different rooms throughout the house on the same circuit. For example, if someone wanted to read the newspaper or watch television, he would have to turn on a switch that would put on every light and electrical appliance in the whole house.
Also, in a series circuit, the more output devices you add the slower the current becomes. If these output devices were, for example, bulbs, this would mean that the brightness of the bulbs would be dimmed. Another disadvantage of a series circuit is that if a bulb were broken or the pathway broken in any way, the other bulbs would go out too.
Advantages are that you can add more power sources, like batteries, and increase the force of the output which grants you more power. In Parallel, however, the power stays at the same voltage of the original power source. For example, if you were running a circuit on a 5-volt battery and it kept the bulb going for two hours and then added another 5-volt battery, it would keep the bulbs going for four hours instead, but it would only give out 5-volts instead of increasing it to ten.
Parallel:
Advantages would be that, if it were light bulbs that were the output devices linked in parallel, if one bulb broke the others would continue going. Also, the brightness of the bulbs would be greater than the brightness of bulbs in series.
Disadvantages are that there could be a risk of fire in some cases. Another would be that, if you have multiple power sources, the power stays at the same voltage as that of the single power source. In parallel, increasing the number of output devices does not increase the resistance like it does in series.
Does a digital signal travel farther than an analog signal?
You need to make a distinction between analog and digital signals, and analog and digital data. Digital data can be sent on an analog signal by using a modem. Digital data sent on a digital signal is done over a wire using voltage pulses at two or more levels. Digital signals can't travel very far without amplifiers, but analog signals can cover huge distances, such as with satellite communications and even communications with deep space probes.
Modern uses are to merely name different stars and to locate them in the sky.
What is wavelength of radio with a frequency of 90.7 MHz?
wavelength=velocity x frequency
wavelength=3x108 x 90.7x103
wavelength=272.1x1011
What is the scope of electronics engineering in Nepal?
The electronics engineer can get job in those companies where electronics equipments plays vital role..for eg.Nepal Telecom,Ncell,airport,Electricity Authority etc. If you are tallent then you can open your own companies to produce devices such as mobile companies,inverter companies etc........
Why internal resistance of an ideal voltage source is zero and an ideal current source is infinty?
Current source means current generator for a circuit.
An ideal current source gives all current to the circuit, but practically a current source does n't give all current to the circuit, instead, a source resistor is connected in parallel to the current source to indicate the current drop.
What is mean by registers in micro controller?
Registers are a special type of memory that are dedicated to micro-controllers (or CPUs). Controllers have register-memory for speed.
The slowest part of any computer is the bus. The bus is the wiring that connects different components. In this case the micro-controller and main memory. While main memory and the micro-controller are both very fast, the wiring between them is slow.
Should the micro-controller have to be slow to compensate for the slow wiring?
The solution is to have register-memory. Memory physically part of the micro-controller that allows the controller to use it instantly. The controller can then move data from a register to RAM as soon as the bus is available.
Register-memory comes from the concept of a Cash Register [1879]. A cash register is used to perform transactions and store money on it's way to a vault the same way a CPU or micro-controller stores data on its way to main memory.
How do you step down 240V ac to 220V ac?
You can use a voltage transformer or converter that is specifically designed to step down the voltage from 240V AC to 220V AC. Make sure to select a transformer that is rated for the appropriate power handling capacity to ensure safe and efficient operation.
What are the componets that make up a circuit?
A circuit can have as little as two components
1 Must have a power source
2. Something for that power source to power, for example a light
*Assuming you already know you need wires to complete the circuit
What are two main types of electron microscopes?
there are several kind of different , we can separate :
1- Methods of analysis
2- properties of Methods of analysis
3-properties of their structure
4-resolution and resoiving power of their
(by : S.M Zendehbad)
How much current must flow to carry 240 watts at 120 volts?
240 watts at 120 volts requires 2 amperes.
Power = voltage * current
What are the specification of diode?
The most important specifications of a diode are:
- maximum forward current
- peak inverse voltage (aka maximum reverse voltage)
- reverse leakage current
- reverse turnoff time (very important in high speed switching diodes)
- maximum power dissipation (only given for power rectifier diodes)
- forward bias knee voltage
- parasitic capacitance (only important in high frequency applications)
All of this and more can be found in the datasheet for the diode.
How do you connect a voltmeter?
You can get one in a lot of places. Some places are Sears, Home Depot, Maybe Radio Shack, or some other hardware store. The best brand you can get is Fluke. It is pretty expensive but it is really accurate.
How many ohm's is a 1M5 resistor?
The plural of 'ohm' is ohms, not ohm's.
The alpha-numeric code for identifying the resistance of a resistor is quite straightforward.
The letter is used as a multiplier. For example, k= x1000 and M = x1000 000. In other words, k represents kilo, and M represents mega.
The position of the letter represents the position of the decimal marker.
So,
- 1M5 represents 1.5 x 1000 000, or 1.5 megohms.
- 15M represents 15 x 1000 000, or 15 megohms.
- etc.
Similarly,
- 1k5 represents 1.5 x 1000, or 1.5 kilohms.
- 15k represents 15 x 1000, or 15 kilohms.
- etc.
How many output terminals in smps?
smps out voltage is 12volt..
A switch mode power supply can have an output voltage of any value. However, common values are 5, 12 and 24V.
A capacitor opposes a change in?
Capacitors charge by transferring charge from one plate to the other. This is not the same as a battery, though it can seem so. They oppose a change in voltage because the two plates are close to each other, separated by the dielectric, and the transfer of charge requires current. Once charged, however, the current becomes zero. The differential equation describing a capacitor is dv/dt = i/c, or volts per second = current over capacitance.
