Why does the resistance of a thermistor decrease as the temperature rises?
Some materials have negative temperature coefficients of resistance, and some have positive temperature coefficients. Carbon is an example of a substance with a negative thermal coefficient of resistance, so it's resistance will decrease as it gets hotter.
What is the substrate of isomerase?
the substrate in isomerase is protein, the myth that is fructose is absolutely a lie.
BUT WAIT?
have you noticed that 'iso' is a type of triangle
TRIANGLE??
ILLUMINATI
the substrate is illuminati
What is thermal runaway in a BJT?
Thermal runaway is where the biasing and operating point is such that the temperature causes the gain to increase, which causes the temperature to increase, which causes the gain to increase, in a vicious circle, leading to destruction of the BJT. Proper biasing and gain management can prevent this from occurring.
What is the term valance band?
It refers to the energy levels in an atom where the electrons that participate in bonding occupy. These energy levels correspond to those of the s and p orbitals of the outermost shell of the atom being considered.
In a DC suppy the frequency is zero. Why?
Frequency, as regards voltage, is a term applied to changes in the voltage per unit of time. As the voltage of the DC (direct current) supply does not change, it does not "cycle" like an alternating current (AC) supply. The frequency of oscillation of the voltage is zero cycles per second, or zero Hertz.
Does every different conducting substance have a unique resistivity?
Please note that resistivity also depends on temperature.In the most general case, the answer is definitely NO; all superconductors have the same resistivity, namely zero.
Other than superconductors, take a look at a table with some typical resistivity values. It would seem quite obvious that for a given temperature:
* Two different substances will, in general, have different resistivities.
* In practice, in some cases the difference in resistivity might be too small to reliably measure.
* It should be possible to find two substances that have the same resistivity at a very specific temperature - since the temperature-dependence will vary from one material to another.
* Likewise, it should be possible to design a mix of two substances, which exactly matches that of another, given, substance.
What tends to decrease reactive power in a circuit?
By adding capacitors or inductors in series (typically lower power) or parallel (higher power power factor correction); the choice of capacitor or inductor depends on whether the reactive resistance is "leading" or "lagging". A capacitor is modelled 1/jCw, where w = frequency in rads; an inductor is modeled jLw. If you know the reactive resistance, and the system frequency, you can calculate how much capacitance/inductance is needed.
How can you express ohms law in mathematical?
Voltage = Current * Resistance
ANSWER: 1000V = 1000 I = 1000 Ohms does not compute
It is a relationship that states if there is 1 ohm and 1 volt there will be =1 amperes flowing. The number can change but the relation ship will not
Diffrence between analog and digital computer?
An analog computer is any computer that represents its data in the form of continuously variable signals instead of the discontinuous encoded symbols used by digital computers.
The electric force that makes current flow in a circuit is related to the what?
The electric force that makes current flow in a circuit is related to the resistance.
What are the parts of a transformer?
A transformer has input and output connections, a primary winding (with or without taps) and a secondary winding or windings (with or without taps). It also includes a core and appropriate wrappings, and (perhaps) a housing. Some kind of accommodation will have to be made for mounting it mechanically.
The 12V battery connected to the 2.4 Ohm combination will supply 12/2.4 or 5A. The individual currents will be 12/3 or 4A for the 3 Ohm resistor, and 12/12 or 1A for the 12 Ohm resistor. The 2.4 Ohm parallel combination is obtained from a simple product-over-the-sum calculation.
Why power does not remains same in series circuit?
In a series circuit, the current through each element is the same current.
Because the total current must flow through every element.
In a parallel circuit, the voltage across each element is the same voltage.
Because every element is connected individually across the power supply.
What factors contribute to the electrical resistance of a conductor?
1) What materials the conductor is made of;
2) the average cross-sectional area along the length of the conductor;
3) the temperature of a conductor also affects its resistance;
4) the length of the conductor is also very important.
Generally, the longer the conductor, the higher its resistance.
Your students' course materials can probably give you a better answer than mine, or at least you'll know it is the right one.
The length, the cross sectional area, temperature of conductor along with the intrinsic property called the specific resistance of the substance.
What are the advantages of tunable laser diodes?
UV lasers are good for analyizing top surface layers. It has a penetration depth of only a few nanometers, making it incredibly sensitive, even to very thin layers.
What are the three types of electronic diagram?
what are the 3 kinds of electonic diagrams ..the three kinds are layout or block diagram, schematic diagram and pictorial diagram
What device modulates outgoing signals and demodulates incoming signals?
To receive a Satellite signal, you need a LNB which is attached to your satellite dish--The LNB and dish is determined by which satellite TV service you have--either Dish Network or DirecTV. The satellite dish is pointed in a particular direction to pick up the correct satellite orbiting the sky. You will also need a satellite receiver, which is "wired" to the LNB and also is attached to your television.
Why inductor is not incorporated in an integrated circuit?
This difficulty arises due to the fact that the IC fabrication techniques are layer oriented which typically involve processes which are applied to multiple horizontal surfaces in a sequential fashion. However the inductive circuits has a "non-planar" configuration which typically has a continuous spiral shape. This particular spiral configuration thus prevents the IC fabrication to integrate the inductive circuits as part of the IC devices.
What is the resistance of the circuit if current flow is 5 amps in a 115-volt power aource?
As resistance is the ratio of voltage to current, you simply divide the voltage by the current to find the resistance.
Strictly speaking however, for a.c. systems, this will give you the impedance, rather than the resistance, of the load. Impedance which, like resistance, is measured in ohms, is the opposition to a.c. current, and is a combination of the load's resistance and reactance.
What are the images of series and parallel circuit?
What size resistor is needed to drop 12 volt dc to 3 volt what is the formula?
The "size" (value or the power capacity) of the resistor can not be defined unless the power of the 3 volt bulb is known. If you tell me how many amps would the bulb draw from a 3 volt source, I will tell you exactly how many ohms of resistance, and how many watts of power capacity will be required of the resistor.
How do you check a capacitor to see if it is good or bad?
There are many ways. FIRST: short the terminals to ensure it is not charged. Many of the digital meters today also have a capacitance check setting, simply use that setting. It not only checks for faults, but also will give you a reading of the capacitance value itself. For most non-electrolytic capacitors a quick check (definately bad vs. maybe good) can be done with an analog VOM. Use the highest resistance scale to measure across the terminals. When first connected there should be a short needle jump that slowly drops back to infinity. Reverse the leads and do it again, should have the same effect. Any resistance highter than infinity indicates a shorted capacitor. Lack of needle jump may indicate an open capacitor (or one of very little capacitance). Electrolytics can also be checked with a VOM, but polarity must be observed, and the drop back to infinity may take a very long time. Alternatively, for electrolytics and larger capacitors is to charge them with a low voltage source (e.g. 9V battery) and measure with multimeter to see if they hold the charge.
What do non Electrolytic capacitor do?
first lets explain what an electrolytic capacitor is to identify an electrolytic capacitor look for positive and negative indicators (non aren't polarized). the reason that its polarized is because the anode is normal but the cathode is a normal one with electrolyte soaked paper this allows more electrons to be stored thus more energy. a non can only hold what the metal can take. but if you reverse the flow it heats and the steam causes the canister to blow. basically a non electrolytic capacitor is a capacitor with no extra features, just a couple of aluminum plates separated by air.
What is the difference between analog and digital watches?
Analog clock shows time passing by moving hands continuously. In contrast, digital clock shows the time numerically. By analog clock you can tell the time between graduations to some extent by the location of the hands because the hands move continuously. But by digital clock, you can not read other than the information shown. If it shows seconds as well, you can tell more precisely