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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 formula for calulating test voltage for Insulation Resistance Checking?
Estimated Insulation Resistance of a cable:
IR = K log (D/d)
K = specific insulation resistance in megohs - 1000 feet at 60 Deg. F (K = 2000 for PVC; 50,000 for EPR; 100,000 for XLP)
D = diameter over insulation
d = diameter under insulation
IR = insulation resistance in megohms - 1000 feet. Note that IR is inversely proportional to the cable length. So don't forget to divide the calculated IR for 1000 ft. by your Cable Length (L) then multiplied by 1000.
Be advised that in the real world, the measured IR may not be anywhere close to the calculated IR due to extraneous influences such as humidity, temperature, dirt, etc.
What is an example of a bad metal conductor?
The element mercury is one of the poorest conductors of the elemental metals. The alloy nickel-chromium (Nichrome) is very resistive and is used to construct the heating elements in many appliances incorporating a thermal source. Saying that a metal is a "bad conductor" can only be supported by a comparison. As thermal or electrical conductivity was not specified, we can only say that in metals, the effectiveness of a metal in conducting one is generally an indication of its effectiveness in conducting the other. Metals that conduct electricity well also usually conduct heat well.
How are voltage resistance and current related?
Current, voltage and resistance are related by the Ohm's law formula which states that current is directly proportional to the applied voltage and inversely proportional to the resistance at a constant temperature.
Stated mathematically:
I = E/R
where I = current in amperes, abbreviated to A
E = voltage in volts, abbreviated to V
R = resistance in ohms, usually signified by the Greek omega Ω
How heavy is the cathode ray tube?
Could you please explain your question more fully?
Is it the last part of a longer question?
There are many types and sizes of cathode ray tubes, which weigh different amounts.
Regards
George
Can current flow in an incomplete circuit?
Maybe there's no voltage-source(AC or DC) because voltage is the one that motivates electrons to flow. It could be the connection of components in your circuit.
How is voltage measures use of load measured in a circuit?
a little thing called an ammeter, you clip this onto your circuit and it measures the voltage!xxx ask again
Why the cost of microprocessor is greater than that of a micro controller?
Microprocessors tend to be much faster than microcontrollers. As real time systems usually don't require fast processors the additional power used for the extra speed is seen as wasted. Older boards are also preferred as it is less likely to contain bugs.
How do you change a 240 circuit to 120?
A step down transformer can do it safely. However there is going to be some loss of efficiency with actual loading so a step down of 1:0.5 ratio can do it the power required is to be implemented.
The statement that current is equal to the voltage difference divided bythe resistance in known as?
Ohm's Law V = I R
Voltage = Current x Resistance
What products use Variable resistor?
Toasters and lightbulbs.
AnswerA resistor is an circuit component. So, while toasters and light bulbs have resistance, they are not resistors!
Discussion of zener diode a voltage regulation?
A zener diode has a relatively flat voltage to current curve when reverse biased. Within limits, you can consider that the voltage across the zener diode is constant. You can use the zener as the primary regulator, so long as you consider the power requirements and dissipation of both the zener and the load, and you do not overload the zener. More often, the zener is used as a voltage reference in a larger power supply that uses other components, linear or switched, to supply the load.
Ripple factor of half wave rectifier of L-section with derivation?
ripplefactor(R)=vrms(Ac)\vdc
=(v^2rms-v^2dc)^2
vdc=vmax/22/7
vrms=vm
ax
Why there is no current in reverse bias condition?
Current flows in a reverse biased diode because diodes are not ideal. They do have leakage current and a breakdown voltage in reverse, just as they have a breakdown current in forward and a non-linear and non-parallel forward voltage to current curve.
It is also possible that you are looking at a zener diode. A zener diode is specifically design to conduct at a certain voltage in reverse.
What are the differences between electronics and photonics?
I think you mean proton and electron...The main difference is charge. Protons are positive and electrons are negative. The mass of both protons and electrons are almost exactly the same. The size of electrons are slightly smaller than that of protons.
Why is the voltmeter connected in parallel but the ammeter connected in series?
The Voltmeter is used to measure the electrical potential difference between two points...
so it's no use to connect it in Series , because the electrical potential difference between two points at the same line is zero ==> the readings will always be zero.
The Ammeter is used to measure the electric current in a circuit...
so it's no use to connect it in Parallel , because you want to know the current flowing in this wire.
note
the internal Resistance of the Ammeter is very little
and very high for the Voltmeter --> so they will not affect the circuit.
What is a maximum voltage across a resistor?
The voltage across the resistor is whatever voltage is applied. The only maximum here would be a voltage that would damage the resistor. If you think this might happen, you'll have to look up such a voltage from the data sheets.
What are the advantages of BPSK?
Binary Phase Shift Keying (BPSK) offers several advantages, including its simplicity and robustness against noise, making it suitable for low-bandwidth applications. It has a relatively low probability of error, especially in environments with high interference. Additionally, BPSK is efficient in terms of power consumption, which is beneficial for battery-operated devices. Its straightforward implementation also facilitates easier modulation and demodulation processes.
Why sine wave is represent in analog signal?
An analog signal is simply a quantity varying continuously over time..But because
we are interested in information and communication, we are usually interested in
rapidly varying signals that have some underlying periodicity. Therefore we use sin wave
How does a germanium diode look like?
Germanium diodes can be point contact, grown junction, alloy junction, diffused junction, or surface barrier; each type is made differently.
- point contact, a sharp pointed metal wire is pressed against the surface of a piece of germanium
- grown junction, as a boul of germanium is being pulled a quantity of the opposite dopant is added to the molten germanium, the boul is then sliced on opposite sides of the junction and diced into individual diodes
- alloy junction, a pellet of alloy containing the opposite dopant is placed on a piece of germanium and heated until it alloys into the surface of the germanium
- diffused junction, dopant of the opposite type of a piece of germanium is applied and heated to allow it to diffuse into the germanium
- surface barrier, a piece of germanium is carefully cleaned then metal is electroplated on a small spot on its surface
Note: all of these methods have also been used to make germanium transistors.
What is kirchhoff's loop theorem?
a closed path in a circuit in which no circuit element or node is encountered more than once.
How do you focus magnetic flux?
Just a hypothesis: Cylindrical shape with cone shape combined in special array. Made of electric coils and permanent magnets.
How do you find average back emf?
Normally emf can be calculated by the following formula
e=N*(dф/dt) where dф/dt = rate of change of flux linkages
In actual practice it is given as e=-[N*(dф/dt) ] because as per lenzs law the voltage induced in a direction to oppose the very cause for it i.e., change in flux linkages.
vydehi
Is there uranium in X-ray machines?
No, X rays are EM radiation and are produced by electrical/electronic equipment
Why Reduction in Depletion region width with increase in doping?
Because Reverse bias constrained the majority carries to repel from both side (P side & N side)hence Depletion layer is formed with a large extant of majority carriers hence the depletion region is wider in reverse bias.
