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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
1000cm
Any capacitor that is initially uncharged, when presented with a step change in voltage, will have an instantaneous resistance of zero ohms. As a result, the instantaneous current with a circuit involving 4500 ohms and 500 volts will be about 0.111 amperes. It does not matter what the capacitance is.
The stated voltage in the question is unclear, so 500 volts was assumed for the answer.
Is it possible to get a voice activated coundown timer?
A: Of course is possible need three assembly. A sound detector, clock and of course a digital counter.
A light emitting diode - LED.
What is the marking 5A 250VAC24VDC on a relay means?
The switching circuit is 24 Volts DC which connects a circuit of 250 Volts AC with a limit of 5A current.
Note: This is presumption based on how a relay works and its purpose.
Why you measure resistivity and not resistance in four probe method?
Resistivity is a constant for a material as opposed to resistance which is dependent on size considerations. This is analogous to specific heat capacity and heat capacity. It can be said that resistivity is more useful for comparison because other factors (size) have been accounted for.
In the case of using the four-probe method to measure the thickness of a thin film:
ρ = (V/I) x (thickness of film) x (correction factor)
We measure the current and voltage using the four-probe method, from which we can get the resistance between the probes. Knowing the resistivity, which is constant for the material and can be obtained from sources such as books, will enable us to relate the resistance to the dimensions of the film.
Advantages of h bridge over other bridges?
h bridge can used as to supply the power in both directions
What is more damping torque or controlling torque?
Following are the essentials of indicating instruments: 1. Operating torque, 2. Controlling torque, and 3. Damping torque. OPERATING TORQUE Operating torque is produced by making use of any of these effects: magnetic, electromagnetic induction...., it is required to move the moving system of the instrument. CONTROLLING TORQUE Controlling torque opposes the operating torque and increases with the deflection of the moving system. It ensures that the deflection of the pointer is according to the magnitude of electrical quantity being measured. If this torque were not provided, the pointer would continue to move indefinitely and the deflection shall be independent of electrical quantity being measured. It also bring the pointer back to zero when the instrument is removed from the circuit. This torque is either obtained by spring or by gravity. In spring control, one or two phosphor bronze spiral hair-springs are attached to the moving spindle. The other end are attached to the frame. In this case Tc proportional to Angle of deflection. In gravity control, a small weight is attached to the moving system in such a way that it tries to bring the pointer back to the zero position when it is deflected, due to gravity. In this casse Tc proportional to sine of the angle of deflection. DAMPING TORQUE Controlling torque controls the deflection and tries to stop the pointer at its final position where its Td = Tc But due to inertia, the pointer oscillates around its final position before coming to rest. Hence damping torque is provided to avoid this oscillation and bring the pointer quickly to its final position. Thus the damping torque is never greater than the controlling torque. In fact it is the condition of critical damping which is sufficient to enable the pointer to rise quickly to its deflected position without overshooting.
How does a voltage quadrupler work?
A Voltage Quadrupler would be a DC circuit. A transformer would be used to increase the voltage in an AC circuit.
To quadruple the voltage in a DC circuit would consist of (min) 4 resistors. 1 resistor would be directly in parallel with the power source, that is, one side of the R would be connected to one side of the source, and the other side of the R would be connected to the other side of the source.
The remaining resistors are configured in a sort of series/parallel with the 1st resistor to increase (ladder fashion) the output voltage. See the related links for a more detailed explntn.
If the decrease voltage and the resistance stays the same is current increased or decreased?
This question follows Ohm's law which states, "Current is directly proportional to the applied EMF (voltage) and inversely proportional to the current in the circuit.
<<>>
decreased
What is a difference between frequency and angular frequency?
Frequency is a metric for expressing the rate of oscillation in a wave. For planar and longitudinal waves, this often expressed in oscillations-per-second or Hz. Angular frequency used for expressing rates of rotation, similar to revolutions-per-second, and is usually expressed in radians-per-second. It can be thought of as a wave with a constant amplitude where the amplitude rotates in a circle in space.
The two differ by factor of 2*Pi.
Omega (angular frequency) = 2*Pi*f(frequency in Hz)
How do you Define the mobilty of charge carrier?
I am assuming the charge carries are electron and hole in an semiconductor.
the mobility of charge carriers can be understood as the easy with which the carrier can move in a semiconductor.
the mobility depends on many factors like the semiconductor material (because of the crystal structure), semiconductor specimen temperature, the effective mass of carrier, the applied electric field across the specimen.
in general if we compare the mobility of electron with hole in a silicon semiconductor, the mobility values at room temperature is some thing around 1350 cm^2 per volt sec and 450 cm^2 per volt sec for electron and holes. that is mobility of electron is 2-3 time more than the holes in silicon.
What is the function of TV flyback?
The TV flyback transformer is obsolete in modern television sets and is not used.
In the old cathode ray tube (CRT) television sets the flyback transformer had two functions:
- generate a large and powerful current pulse to drive the horizontal deflection coil in the yoke around the neck of the tube to create a quick horizontal retrace between sweep lines
- using a large secondary autotransformer winding produce a very high voltage (i.e. 15KV to 100KV) rectified by a high voltage diode needed by the anode of the CRT to accelerate the electron beam
How can a flip flop be used in frequency division?
The flip-flop can be configured to change state on each clock pulse. This causes the output of the flip-flop to be one half of the input frequency - hence the term "frequency division".
You can also configure more than one flip-flop into other divider scenarios, such as divide by 3, 5, 10, etc. You can also use the output as the input to a phase-locked-loop, resulting in frequency multiplication.
What two things must happen to cause an silicon controlled rectifier to fire?
You must have a voltage on the gate that exceeds the turn-on threshold of the SCR. Typically around 0.65v. Then you must maintain a minimum holding current from Anode to Cathode. Once turned on, the SCR will remain self latched in the on state until the current through the Anode and Cathode falls below the minimum self holding current.
What is Modulation index in Frequency modulation?
Modulation Index is the ratio of the maximum deviation frequency to the frequency of modulation. In other words it is the ratio of the spread in frequency spectrum to the frequency that was used to modulate the carrier.
For FM,
modulation index is given by the formula
mf= df/f
where,
mf=modulation index for FM
df=difference in carrier frequency
f=frequency of the signal
waht si a picture of signification
What is open drain or open collector?
Open drain or collector means ,collector and drain terminal of BJT and MOSFET will be left open during implementation/fabrication.They will not be connected from Supply Vcc or VDD.
Following components can exist
1. 1000 KHz
2. 1000.3 KHz
3. 1002 KHz
4. 999.7 KHz
5. 998 KHz
If you have to add two alternating voltages how to add them?
A: Alternating voltages means the phase factor must be considered.
