0
Circuits
Overachieving and under-appreciated, circuits are the foundation that our technological society is built on. Now's your chance to find out not only how they work, but why. Questions regarding the physics behind voltage, resistance, capacitance, inductance, transistors, LEDs, switches, and power supplies; and how they're used to create analog and digital circuits, should be directed here.
1,646 Questions
LED diode:
when certain amount of voltage is applied to LED diode the electrons which are present in lower energy level jumps in to higher energy level after certain time the electrons in the higher energy level again jumps in to lower energy level .
while jumping from higher energy level to lower energy level electrons emits energy in the form of light(visible or invisible)
If a circuit needs a round trip to work how does a telegraph work on a single wire?
The return path is through the Earth. That's called the "ground" connection.
What is the voltage drop for 500 meters 1.0mm copper cable drawing 230ma with 24volt supply?
The resistance of 1 mm (diameter) solid copper is about 21.8 ohms per kilometer.
That's 10.6 ohms in 500 meters.
When 230 mA flows through 10.6 ohms, the voltage drop is
I · R = (.230)x(10.6) = 2.438 volts.
The voltage of the supply is irrelevant.
What does the capacitor in a generator do?
The capacitors in a generator is to store energy produced. They are also needed when starting the generator as a considerable amount of extra power is needed at this time.
ANti side tone circuit in telephone is used to?
The anti-sidetone circuit in telephone is used to suppress side-tone.
The anti-sidetone circuit is an assemblage of transformers, resistors, and capacitors
that perform a number of functions.The primary function is to reduce sidetone, which
is the distracting sound of the speaker's own voice coming through the receiver from
the transmitter. The anti-sidetone circuit accomplishes this reduction by interposing
a transformer between the transmitter circuit and the receiver circuit and by splitting
the transmitter signals along two paths. When the divided signals, having opposite
polarities, meet at the transformer, they almost entirely cancel each other in crossing
to the receiver circuit. The speech signal coming from the other end of the line, on
the other hand, arrives at the transformer along a single, undivided path and crosses
the transformer unimpeded.
The anti-sidetone circuit also matches the low electrical impedance of the telephone
instrument's circuits to the higher electrical impedance of the telephone line.
Impedance matching allows a more efficient transfer of energy between the
instrument and the line.
How will an electrical circuit behave if there is an open circuit?
The circuit is incomplete, you will have no continuity, no flow of current
to the load or other components. The voltage across every component
in the circuit is zero. No part of the circuit stores or dissipates any energy.
In short, the circuit doesn't work.
A digital signal composed of a pulse of positive voltage represents a?
One
A2:In positive logic (most logics), a High, that is, a positive voltage over about 3.5 volts, is considered a "one".
Circuit diagram for FM transmitter of 5km?
Sadly, this website doesn't include the capabilites of storing and
reproducing drawings.
Any FM transmitter will have the following circuit blocks:
- power supply
- audio amplifier/equalizer
- reactance modulator
- oscillator
- pre-emphasis network
- frequency multiplier
- bandpass network
- power amplifier
- antenna matching network
- transmitting antenna
The power amplifier will be designed for the required output power,
or somewhat more.
"km" is not a unit of power.
Diagram of air spaced variable capacitor?
An air-dielectric variable capacitor consists of two conductors ...
wires, foil, plates, etc ... with air between them, and an arrangement
whereby the overlap or the spacing between them or both can be
changed easily.
Sadly, this website doesn't support the storage or presentation of
graphics in the answer area, so I can't give you a diagram.
Explain working of ttl for NAND gate?
In the NAND gate, the transistors play the role of the switches. The emitter and the collector voltages vary in the opposite phase.
What are three kinds of switching mechanisms used in low-voltage thermostats?
Mercury Bulb, heat-anticipator and a cold-anticipator.
Why the form factor is 1.11 for sinusoidal ac?
The defination of form factor is
FF=RMS/avg(abs(f(t)))
for sin waveform
RMS=0.707*peak(f)
avg(abs(f(t)))=2/pi*peak(f)
so
FF=0.707/(2/pi)=1.1106
How can you solve second order differential equation using op amp ckt?
this can be done using 3 op-amps in series.inthe 1st one connect a capacitor for feedback with a key across its end to charge and discharge it.in 2nd cnect capacitor across 2-6 and across its ends connect batery with akey in sereis.in 3rd just connect r for feedbak.conect o/p of final to 1st opamp through R.take o/p across final 6and ground
How Laplace Transform is used solve transient functions in circuit analysis?
f(t)dt and when f(t)=1=1/s or f(t)=k=k/s. finaly can be solve:Laplace transform t domain and s domain L.
What is the purpose of the voltage divider control in oscilloscope?
This control reduces the amplitude of the applied signal to a point where the whole signal can be displayed on the oscilloscope screen. The amount of voltage reduction is marked on this control switch so that it can be used as a voltmeter.
What the function of tolerance for resistor colour code?
Tolerance indicates how much the measured value of a resistance is different from its theoretical value, and it is calculated using percentages.
Construct BCD to excess3 code using full adder circuit?
4 full adders will be used BCD is a 4 bit code. Each bit of the BCD number will be an input of each full adder. input 1 in first FA. 1 in second and 0 in the last to FA's
Who discovered Direct Current?
Thomas Edison used direct current in his electric power transmission in the 1800's.
This isn't very relevant, but it is "Quite Interesting"
From QI--Elephant in the Room: In 1903, Thomas Edison made a film called Electrocuting an Elephant, in which he used an alternating current to kill an elephant called Topsy. He used the film as a propaganda film to destroy the reputation of alternating current, owned by Westinghouse, believing his direct current was safer. He tried to encourage people to call being electrocuted, "Westinghoused".
The door interlock prevents the switchboard door from being opened unless the breaker body is in the ISOLATED position. Only when the draw-out handle is removed from the ACB when the ACB is in the ISOLATED position, is the door interlock released and the switchboard door allowed to open. When inserting the ACB back into the carriage, the switchboard door must be closed once the breaker is in the ISOLATED position. When the door interlock is supplied a special draw-out handle is also supplied.
