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In semiconductors, the relationship between the flow of electrical current and electrostatic potential across a p-n junction depends on a characteristic voltage called the thermal voltage, denoted VT.
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What is drift voltage?
A: Drift voltage is an an wanted voltage that wander off from what is expected. I sources for wandering could be thermal or a component drifting in value.
Why a normal diode in forward biased condition is not used as voltage regulator?
Because the voltage/current curve is not as steep as we would like and because the diode is too sensitive to thermal effects in this area.
What the purpose of the diode rectifier used with a ac analog voltmeters?
The analog voltmeter uses a dial, which changes its position in accordance with applied voltage - however, this voltage must be DC in order for this to work (it's through either thermal or magnetic expansion). So, the AC must first be rectified into DC, before any measurement can take place. Of course, rectifying AC into DC does increase the voltage (as it must - this action multiplies the voltage value by the square root of two), so before the measurement can occur, this increase is properly sanitized by associated circuitry (for example, a voltage divider could be used).
What ways can voltage be produced?
Voltages are produced by converting one form of energy into electrical energy. Mechanical energy can be converted into electrical energy (voltage and current) by moving a magnet or magnetic coil in proximity with a stationary coil, connected to an electrical circuit. A voltage can also be produced with a chemical reaction. Batteries and fuel cells convert energy in specially designed cells, where a chemical reaction causes a voltage to exist across two electrodes implanted at two different parts of the cell. A voltage can be produced by the interaction of light on a photocell. The photons of light interacting with atoms in the photocell, cause an electron to be ejected. The special design of the photocell causes this to occur in such a manner as to produce voltage across the cell. A voltage can be produced by subjecting a thermocouple to differential temperature. A thermocouple is a relatively simple device composed of two dissimilar metals, joined together at what is referred to as a thermal junction. If one side of the junction is warm, relative to the other side of the junction, a voltage exists across the junction.
What is the difference between voltage forward voltage and voltage drop?
Voltage is the potential difference between the source & any point in the circuit. The forward voltage is the voltage drop across the diode if the voltage at the anode is more positive than the voltage at the cathode (if you connect + to the anode). Voltage drop means, amount of voltage by which voltage across load resistor is less then the source voltage.
What is the measure of how a transistor reacts to changes in temperature?
The thermal voltage.
What is drift voltage?
A: Drift voltage is an an wanted voltage that wander off from what is expected. I sources for wandering could be thermal or a component drifting in value.
Difference between avalanche zener and thermal breakdown?
Avalanche is when you surpass the negative bias voltage threshold and the zener breaks, thermal breakdown would be putting too much current or voltage across the zener and burning it out.
What factors control the voltage of a Johnson noise source?
It is the bandwidth, the temperature, and the resistance. Look at the link: "Calculation of Noise voltage: Thermal noise".
What is avr in turbo generator in thermal power plant?
AVR stands for automatic voltage regulator.
Gm of a transistor is proportional to?
Gm of a transistor is proportional to Ie/Vt. That is, emitter current divided by thermal voltage.
What are the relationship between Diode voltage and temperature?
The equation relating diode voltage and current is: Id = Is*(exp(Vd / n*Vt) - 1) Where: Id = Diode current Is = Saturation current exp() = exponential function (e^) n = Ideality factor Vt = Thermal voltage The relationship between temperature and diode voltage comes from this Vt, the Thermal voltage, which is defined as: Vt = k*T / q Where k = Boltzmann constant (8.617 * 10^−5 eV/K) T = Temperature in Kelvin q = Elemental charge (1.602 * 10^−19 C) Thus, the temperature affects the thermal voltage (an electrostatic voltage across the PN junction), which affects the diode's Id and Vd properties.
What won't work when a thermal fuse is bad in a microwave oven?
We usually see a thermal fuse that has failed open the primary circuit to the high voltage transformer, which in turn drives the magnetron in that appliance.
Why a normal diode in forward biased condition is not used as voltage regulator?
Because the voltage/current curve is not as steep as we would like and because the diode is too sensitive to thermal effects in this area.
Can increasing the voltage to your laptop break it?
There are voltage regulators built into the laptop for the various buss voltages needed for the system. However those regulators have a maximum input voltage rating that once exceeded will blow out the regulator IC. As long as the voltage input does not exceed the built in regulators or overtax the ability of the laptop to cool the system and regulator IC's to normal operating temperature ranges, you will be safe. Thermal protection circuits may or may not save the system however if thermal limits are exceeded.
What is thermal electromotive force?
Electromotive force (EMF) is another term for voltage. Thermal EMF is voltage that is created by thermal (heat) energy, and there are several ways this can be done. Let's look at one.The most common application of the idea of the generation of voltage by what we call thermoelectric effect (which is a form of contact potential) is probably the thermocouple. This device, which is essentially the placement of two dissimilar metals up against each other, will cause a difference of potential (a voltage) to appear across the junction of the two metals. This characteristic makes the device very useful in measuring temperature, to cite just one application of the idea. A link can be found below for more information.
How electricity is made and its efficiency?
High-voltage direct-current (HVDC) technology is used for greater efficiency. Underground lines are strictly limited by their thermal capacity.
