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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
Who can tell? The power rating of a resistor simply tells us the maximum power that resistor is capable of handling; it doesn't tell us anything about the actual power being produced for any given current. So, to find out the voltage drop across that resistor, you will need to find out its resistance, and multiply this value by the current you specify.
In the circuit where the DC motor is added, it was not specified whether the motor was added in series or in parallel to circuit elements. If it was added in series, it will increase circuit resistance and it will cause circuit current to go down. In parallel, the motor will reduce total circuit resistance, and circuit current will increase.
A mobile phone mast is the structure which holds the antennna to a mobile phone base station. Each base station serves a small geographical area and can handle a limited number of calls at any time, and are placed local to where people use their mobile phones.
2.0 x 1013 electrons flow through a transistor in 1.0ms. what is the current through the transistor?
One ampere is 1 coulomb (6.242×10^18) of electrons traveling past a point in 1 second. (2e13 / 1e-3) * (1 / 6.242e18) = 0.0032 or 3.2mA.
Why are audio frequencies difficult to radiate?
In order to radiate and intercept energy efficiently, the physical size of the transmitting and receiving antennas must be an appreciable portion of the E & M wavelength.
An electromagnetic wave at an audio-frequency ... let's say 1 KHz ... has a wavelength of
( c / 1,000 ) = ( 3 x 108 / 103 ) = 3 x 105 = 300 kilometers = about 186.4 miles
Even at the nominal limit of the frequency range of hearing ... say 20 KHz ... the wavelength is
( 3 x 108 / 2 x 104 ) = 15 kilometers = 9.3 miles.
In order to have a fighting chance of successful radio communication at audio frequencies, over reasonable distances using reasonable transmit-power, the parties at each end of the link need antennas measured in miles.
There are plenty of other great reasons that we don't use radio at the physical baseband frequencies; but even of there were no others, this reason alone is a pretty potent show-stopper.
What is the electrical circuit for the radio in cars?
Car radio electrical circuits are as veried as the radios themselves. Certainly they have a lot of commonality, but each is unique. For a given unit, the manufacturer holds the circuit diagram. Other than that, about the only thing you could get your paws on would be a block diagram showing the general functional areas of the radio. If the question is pointed at the wiring diagram for the radio harness, that information is available from the car folks. Wire color and arranement differ from one unit to the next. A shop specializing in auto sound systems may be able to help.
Resistance: Electrical resistance describes how an electrical conductor (a wire) opposes the flow of an electrical current (flow of electrons). To overcome this opposition a voltage (a energy) must dropped (used) across the conductor (wire). Resistance can be described by ohms law: Ohms Law: R = V / I (Resistance = Voltage / Current) (resistance measured in ohms) where: Voltage [V]= the energy lost across an component (voltage measured in volts). Current [I] = the charge (electrons) flowing through an component (current measured in Amps). Electrical resistance can be thought of as sticking your hand out a car window. The faster [current] you drive the harder the wind presses [resistance] against you hand and therefore it takes more energy [voltage] to hold your hand steady. When trying to overcome electrical resistance, the electrical energy lost is turned into heat. This is how the elements of a household stove, toaster, and fan heater work. Because of the vacuum in a light bulb, the electrical energy lost is instead turned into light. It can be seen the electrical resistance plays a large role in modern life. Resistor: The resistor is the most common electronic component and is used to limit and/or control the voltage and current in an electronic circuit. Resistors are carefully manufactured to provide a predetermined value of electrical resistance which may range from 0.1 ohms to 100,000,000 ohms, depending on the application. The physical size of a resistor also varies dependant on the amount of power passing through the resistor, given by: P = V x I (Power = Voltage x Current) (power measured in watts) There are also many types of resistors including: · Variable Resistor - changes resistance when its shaft is rotated (volume knob on a stereo). · Thermistor - changes resistance when the temperature changes (used in a thermostat). · Light Dependant Resistor (LDR) - changes resistance when the lighting changes (used in children's night-lights). Resistor Example: An LED is a small red light (such as the one on the front of most TVs) and requires 2.0 volts and 0.02 amps to operate correctly. If we connected that LED up directly to a 12 volt battery, the voltage would be too high, and too much current would flow… the LED would blow up. We need to use a resistor to limit the voltage and current. But which value of resistance should the have resistor? Uses ohms law: R = V / I = (12.0 - 2.0) / 0.02 = 500 ohms (Note: the voltage across the resistor is the battery voltage minus the voltage we want across the LED) But which value of power should the resistor be capable of handling? P = V x I = (12.0 - 2.0) / 0.02 = 0.2 Watts
Is the tester can check voltage or current in a wire?
Sure. You go to Radio Shack or Home Depot or any electronics dealer or go online and you get yourself a digital multimeter for about 15 bucks. That will give you voltage for sure, but it will only give you current up to a few hundred milliamps. If you want to measure serious current, like how much current your electric clothes dryer is pulling you need a specialized clamp meter. But, if you didn't know the answer to the question, you should buy a new one because it will come with instructions, which you will undoubtedly need.
Phil
Capacitance is the property of an electrical circuit that?
A capacitor resists a change in voltage, proportional to current, and inversely proportional to capacitance. The equation of a capacitor is dv/dt = i/c.
Why the name push pull is given to class B power amplifier?
Because two amplifiers are used to accomplish class B power amplifier. One is used to push the current and the other one is used to pull the current. These two amplifiers are almost same but one is connector supplied and the other one is emitter supplied.
A: ALL computer have an I/O and have interrupt signals these signal are there to service whatever is requesting a service. A printer request for instance or a USB device the processor will wait until the service is completed unless it is released. lesson to learn the I/O is the pace of speed not the speed of the CPU which usually loaf waiting for interrupts to be finished. Fast I/O buss means a fast computer.
Can FM transmitters ruin the radio?
Not unless you hard-wire them together. Just driving by an FM transmitter,
no matter how close, won't hurt the radio.
Is conventional flow or electronic flow true?
Electronic flow is true.
Conventional flow was thought to have positive charges flowing from the + terminal to the - terminal. This was before we knew that it is actually the electrons which flow, and the positive charges cannot move out of their atomic nuclei. Now that electrons have been detected, and protons are known to stay within the nucleus unless a nuclear reaction takes place, we know that it is the electrons that flow from the - terminal to the + terminal. This is known as electronic flow.
What barrier is constructed to create hydroelectric power plants?
It is something okay so don't really have to answer it because if you put something on your paper you will get it right.
Please help Me?
Why do we mostly use indirect semiconductors?
The indirect band gap semiconductors like silicon and germanium are mostly used because they are elemental, plentiful, and easier to process than the direct band gap semiconductors which are alloys or compounds.
Why is the sink current higher than the source current?
In what?
- this is true in TTL logic ICs because the pulldown drive transistor is strong and the pullup drive transistor is weak
- this is false in CMOS logic ICs because both pulldown and pullup transistors are identical
- in other devices it varies
Resistors will be needed in all cases when driving LEDs from a voltage source, unless you are using LEDs that already have a built in current limiting IC inside the package (a few do these days, for example I have some blinking LEDs that need no resistor they have a blinker IC built in that also limits current).
However you have another problem that you obviously are not aware of. 8 LEDs rated at 1.5V in series totals exactly 12V. But your battery is only rated at 12V. As the battery discharges its voltage slowly drops, the moment it drops under 12V all the LEDs will turn off! I strongly recommend that you use no more than 7 LEDs rated at 1.5V in a circuit powered by a 12V battery, so that the battery can actually gets a chance to discharge beyond its knee voltage. In this case the resistor will drop the remaining voltage, whatever it is depending on the charge state of your battery.
Why is ferric chloride stored in airtight bottles?
Ferric Chloride is an intensely hygroscopic chemicaland thus will literally suck water from the air, dissolving into this water spontaneously forming a dark brown solution. Keeping it in an airtight container prevents this, keeping the crystals in solid form.
Can you implement higher order mux from lower order.how?
yes, given MUX in number To be implemented MUX
2:1MUX x 3 4:1MUX
4:1MUX x (4+1) 16:1MUX
4:1MUX x (16+4+1) 64:1MUX
8:1MUX x (8+1) 64:1MUX
8:1MUX x (32+4+1) 256:1MUX
Why does Jim use dc supply in oscillator circuits?
Jim use dc supply in oscillator circuits to and ac out put.
Is there a pulsating current dc transformer?
Yes, an example is an automobile's ignition coil, which is energised from the battery, via the contacts within the distributor. The contacts open and close, supplying the ignition coil with pulsating current.
