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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
Circuit diagram of prepaid energy meter?
See the related link below.
It is build by using 8051 microcontroller, you can also get the source code from there.
What is the unit used of resistor?
The ohm. It is how much resistance a component or part of a circuit has to the flow of electrical charge when a voltage is induced across it.
Why does the current rise when the voltage drops?
It is not generally true that current increases when the voltage decreases. Ohms law for a simple resistor says that current is proportional to voltage.
However an electric motor supplying a constant mechanical load power will readjust to a lower supply voltage by drawing more current, although if the voltage is progressively reduced the motor would stall.
Switch-mode power supplies also tend to draw a constant power from the supply when the input voltage changes.
What are causes of change in voltage of alternators when loaded?
actully when load of alternator fluctuates it changes the torque at primovers which changes amps so terminal voltage of alternator changes.
Can you charge batteries with a different mAh rating?
You can charge batteries with a different mAh rating if the charger is designed to handle them. You need to make sure of this, because Ni-Cad battery full charge state is not necessarily voltage dependent, but rather is dependent on detection of a change in voltage slope. If the power supply is not properly designed, you can overcharge the batteries, damaging them.
Why would an electric wire be covered with an insulatos such as plastic?
Plastic being nonconducting, it avoids electrocution when covered around electric wire.
What would happen if you use one leg of a 220 circuit and it's neutral to power a 110 light?
it will lite . <P>
<P></P>Well, you sorta answered your own question, if you are talking residential wiring. The transformer in front of the house supplies 220V, center tapped, to your house. (we are talking the USA, right?) Center tapped means that the secondary of the transformer feeding your house is supplying 220, but there is a wire in the center of the secondary coil that has 110 between it and either end of the coil. If you look in your fusebox (breaker box in any newer home) you will see breakers on the left and on the right. The ones on the left side supply power from one end of the coil into your house and the center tap, and the ones on the other side supply power from the other end of the secondary and the center tap. 220 volts goes from either end of the secondary and doesn't bother with the center tap. I think the answer to the question is, you'll make light. be careful fooling with the cords, though.
Why voltage induced when moving coil cuts flux?
The magnetic flux passing the coil changes by its rotation thus induced emf is produced and induced current flows
What is the equation for power current and voltage?
1. Formula with respect to the current(I) & resistance(R)
V = I.R
2. Formula with respect to watt power(P) & current(I)
V = P/I
How voltage stays constant in a closed electrical circuit?
A voltage regulator. Examples are the 78dd series of regulators where dd is the voltage, e.g. 7805, 7812. These work with a positive rail, the 79dd regulators work with a negative rail.
Which instrument is suitable for measuring both a.c. and d.c. quantities.?
We use the "MOTOR GENERATOR SET" to convert the DC power to AC power we use DC motor and ac generator in it. It is very efficient way to convert the DC power to AC power.
A circuit flow on a open switch?
no because when you close it, the circuit is complete so it lets the electrons pass through
The frequency is 300/30 = 10 Hz
The time period is 30/300 = 0.10 seconds
How do you calculate voltage efficinecy in DC voltage?
The efficiency of a device in electronics and electrical engineering is defined as useful power output divided by the total electrical power consumed.
Scroll down to related links and look at "Electrical efficiency - Wikipedia".
How do you test a thyristor module using multimeter?
You can check if it is shorted, but without coordinating the gate and anode voltages with the cathode, you cannot test a thyrister (SCR) with a multimeter. Check it out of circuit for shorts, then check the circuit, then test it in operation. Anything more advanced will require an oscilloscope.
its also named as potential transformers...it is one type of instrument transformers used to measure high range voltages using low range volt meters. basically it is used to extend the range of meters.
Why thyristor is also called as silicon controlled rectifier?
For the same reason that its used in transistors and resistors...Its a semiconductor.
What are the examples of electronic tools and equipments and their functions?
One example of a circuit device is a switch. It is used to stop and start current flow in a circuit.
Which integrated circuit chips are used in a modern computer?
The microprocessor is the most common integrated circuit chip that is used in modern computers. The microprocessor is a multipurpose, programmable device, and processes data according to instructions stored in its memory thus providing the results as output.
How much current flows through a 12 ohm flashlight bulb operating at 3.0 volts?
Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.
Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.
Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.
Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.
What happens to d.c motor when Field is weakened in DC?
when the field winding of dc motor opens the flux is zero so the speed is inversely propotional to speed ,so motor runs at dangerous speed...........
(R1 * R2) / (R1 + R2) = 2 Parallel
R1 + R2 = 9 Series
Treating the two as simultaneous equations, and substituting for R1:
((9-R2) * R2) / (9 - R2 + R2) = 2
R2^2 - 9R2 + 18 = 0
Solving the quadratic, we get:
R2 = 6 ohm R1 = 3 ohm
Which you can check by substituting back into the original equations.
