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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 left leg of the led called?
Cathode and an anode
They are called the "anode" and the "cathode", just like every other diode ever built.
What can high voltage do to you?
The really dangerous thing is how many electrons per second travel in the human body and this is the current. So the current is the "dangerous" part, and, as i remember correctly,
if you stick(similar to electrolysis where your blood acts as an electrolyte ,here current is directly set up in the electrolyte) 2 electrode needles in your body, a 9V battery is sufficient to electrocute you (because the resistance of the electrolyte in the blood is really low and so the current is high), but if you don't stick(just touching the too needles with hand etc etc..) anything in your body but only touch two wires, the tissue resistance is high enough and the 9V battery is harmless.
How does on load tap changers operate?
On-load tap-changers are operated by an electric motor, often by driving a flywheel mechanism. The operation of the tap-changer is controlled by an AVR (automatic voltage regulator) which monitors the transformer's secondary voltage.
What is the equivalent resistance of two resistors of 1 ohm and 3 ohm connected in parallel?
35 ohms if they are in series as R(total) = R1+R2+R3
If they are in parallel then the formula is 1/R = 1/R1 + 1/R2 + 1/R3
Which in this case gives 2.86 ohms.
The total resistance when resistors are in parallel is ALWAYS LESS than the lowest individual value.
Difference between monostable multivibrator and astable multivibrator?
No, cant use bistable multivibrator in place of monostable multivibrator... because monostable is meant for one stable state and one unstable state.. so there will be a constant time period for the alternate pulses of output.. but in bistable multivibrator, both are stable states.. so there is no specific time period for the output pulses.. the state will vary only on the application of mannual trigger...
What is the characteristic of a material that hinders electron flow?
It is called resistance
Good conductors have a bad resistance
While bad conductors or insulators have good resistance against the flow of electricity
Ohm's Law
What is the resistance of 70ohms and 30 ohms in a parallel circuit?
we have this 1/Re = (1/R1)+(1/R2) for calculating the effective resistance when resistances are connected in parallel
so the answer would be Re =( 70*30) / (70+ 30)
= 21 ohms
What is the working principle of a spygmomanometer?
The sphygmomanometer is designed to monitor blood pressure by measuring the force of the blood in the heart where the pressure is greatest. This occurs during the contraction of the ventricles, when blood is pumped from the heart to the rest of the body (systolic pressure). The minimal force is also measured. This occurs during the period when the heart is relaxed between beats and pressure is lowest (diastolic pressure).
Overall brightness (not individual bulbs' brightness) will increase when we connect them in parallel & it will decrease when we connect them in series.
DC (direct current) means the current flows only in one direction. In AC (alternating current), the current changes direction continuously (for example, 50 or 60 cycles per second).
Why do people say 110 volts instead of 120 volts?
Europe uses 220/240 volts, USA and Canada use 110/120 volts. The lower voltage is less dangerous if you touch a live wire.
What are the different parts of varactor diode?
The varactor diode is a semiconductor diode but in this kind, the capacitance is supposed to vary according to the applied voltage. It has an exponent factor that bears a negative fraction value.
Is an open switch in an electrical circuit to prevent current flow?
Yes, an open switch breaks the circuit and prevents electricity flowing through. A closed switch on the other hand completes the circuit and in turn helps electricity travel through the circuit.
How much voltage does a battery produce?
Depends on the battery but they are current sources as opposed to voltage sources
Standard AA, AAA, C and D batteries all give 1.5 volts each, but rechargeable NiMH batteries are often 1.2 or 1.25 volts.
Will a charge exit a circuit with less energy than they had when they entered the circuit?
It makes sense for charge carriers to lose energy in a circuit, but I don't think it quite works that way. For example, a voltage doesn't accelerate an electron or other charge carrier at a single point - rather, the force experienced by the charge carriers would be spread out over a larger area.
inductor was invented by scientist lenz so it is denoted by l..
How long will it take a 0.047uF capacitor to charge 99 percent through a 100 k ohm resistor?
To find out the Question we also need two values,that is the value of the source voltage Vo & the value upto which they capacitor charged V.
Then,
V=Vo(1-e^(T/t))
where t=RC
U can find out the Answer.
Difference between a semiconductor and insulator?
The difference among Metal,Semiconductor and Insulator is written bellow-
1.Metal:Substances through which electricity can pass easily is called Metal.
1.Semiconductor:Substance which conductivity lies between Metal and Insulator are called Semiconductor.
1.Insulator:Substances through which electricity can not pass easily are called Insulator.
What is more accurate analog or digital?
Usually digital, it is definitely less expensive to get highly accuracy with digital then analog. Also analog haas drift, stability, etc. problems that digital does not have.
Any hardware whatsoever satisfies the conditions of this question ... as long as it has
three input lines ... since the question neglects to specify what it wants the circuit to do
with the 3-bit input number.
Who developed the first transistor?
- The first computer (a mechanical analog computer) is believed to have been invented circa 100BC by Archimedes.
- The first digital computer (a mechanical computer) was invented about 1837 by Charles Babbage.
- The first electronic digital computer was invented in 1937 by John Vincent Atanasoff.
- The first integrated circuit (a hybrid device) was invented between 1949 and 1951 independently by Werner Jacobi, Geoffrey W. A. Dummer, and several others; however the first working units had to be built with sockets for special miniaturized vacuum tubes, it was only late in the 1950s that transistors replaced the tubes in these devices.
- The first monolithic integrated circuit was invented in 1958 by Jack Kilby, this germanium device was not very practical to manufacture and never went beyond prototype development.
- The first practical monolithic integrated circuit was invented independently in 1959 by Robert Noyce, this silicon device was rapidly improved on.
- The first transistor (a germanium point contact transistor) was invented in 1947 by John Bardeen and Walter Brattain.
- The first junction transistor (a germanium grown junction transistor) was invented in 1948 by William Shockley.
Why the value of armature resistance is low?
Because it is made of pure wire with nothing beyond its length and interaction with its neighboring wires to create resistance
