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An ideal amplifier will have a very high input resistance, and low output resistance. This is so it doesn't "load" the input circuitry, and can drive output circuitry.
Say you hooked an op amp up to a microphone that kicked out 100mV unloaded. If you shorted out the microphone, the output would approach 0mV (very low resistance load). If you connected a very high resistance load instead, the output would remain close to 100mV. As the load becomes a smaller resistance/bigger load, the output voltage will decrease until it is no longer useful. This is because the microphone has an internal resistance that remains constant while you're varying the attached load. The voltage drop across the internal resistance will increase as current output increases, causing less of a signal to be delivered to the amplifier.
What else can I help you with?
An accurate voltmeter must have an internal impedence of?
very high value
What does a input-turbine speed sensor circuit malfunction do?
it effects your transmission. If the input-turbine is not working properly, it will make your car transmission slip. It is very bad on your car to run it with the input turbine malfunctioning. It is not that pricey to get fixed. It costs around $260.00 with tax and labor.
What happens to rock when it is exposed to very high temperature?
Rock exposed to very high temperature and pressure will soften or melt.
Is Nigeria a high or low context country?
very high context
What is opamp?
An operational amplifier, which is often called an op-amp, is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.[1] An op-amp produces an output voltage that is typically millions of times larger than the voltage difference between its input terminals.Typically the op-amp's very large gain is controlled by negative feedback, which largely determines the magnitude of its output ("closed-loop") voltage gain in amplifier applications, or the transfer function required (in analog computers). Without negative feedback, and perhaps with positive feedback for regeneration, an op-amp essentially acts as a comparator. High input impedance at the input terminals (ideally infinite) and low output impedance at the output terminal(s) (ideally zero) are important typical characteristics.Op-amps are among the most widely used electronic devices today, being used in a vast array of consumer, industrial, and scientific devices. Many standard IC op-amps cost only a few cents in moderate production volume; however some integrated or hybrid operational amplifiers with special performance specifications may cost over $100 US in small quantities. Op-amps sometimes come in the form of macroscopic components, (see photo) or as integrated circuit cells; patterns that can be reprinted several times on one chip as part of a more complex device.The op-amp is one type of differential amplifier. Other types of differential amplifier include the fully differential amplifier (similar to the op-amp, but with two outputs), the instrumentation amplifier (usually built from three op-amps), the isolation amplifier (similar to the instrumentation amplifier, but which works fine with common-mode voltages that would destroy an ordinary op-amp), and negative feedback amplifier (usually built from one or more op-amps and a resistive feedback network).
What is the applications opamp buffer circuit?
An opamp buffer circuit is one where the input signal is connected to the plus input, and the output is connected to the minus input. Within the performance limitations of the opamp, the output will track the input. The advantage of the buffer circuit is that is presents very little load impedance to the input signal, while providing a low impedance from the output to drive whatever circuitry is connected there.
An accurate voltmeter must have an internal impedence of?
very high value
What are the main differences between FETs and BJTs in terms of input impedance?
FET has very high input impedanceBJT has very low input impedance
Compared to bipolars FETs have-a high input impedance b low input impedance c same input impedance?
FET s have very high input impedance when compared with Bipolar transistors.
How do you make a bass amp sound like an electric guitar amp?
If you are using a guitar amp as a pre-amp to a bass amp (plugging your guitar into a guitar amp, and then patching the guitar amp to the bass amp), do not do this. Bass, acoustic guitar, and vocals (mics) are low impedence, where guitars are high impedence. You can very easily damage your equipment doing this sort of thing. If you are trying to get guitar sounds out of a bass amp, in my opinion, it's next to impossible. There is only one type of bass amp that I know of that you can accomplish this with...Ampeg has a series of bass amps with "switchable tweeters", meaning that they come equipped with tweeters, but you can turn them in order to use rig as a bass amp, and turn them on in order to play an acoustic guitar thru the bass amp. Since an acoustic guitar is low impedence, this works fairly well. You can also plug in an electric to this setup, even tho an electric guitar is high impedence...It's possible to plug in a high impedence instrument into a low impedence amp, but it's not advisable to plug in a low impedence instrument into a high impedence amp.
Does the dynamic impedence of a zener diode vary?
A: Yes it does since the break down is not exactly very linear.
A differential amplifier is used In input stage of op-amps to achieve very high?
CMRR
Is it possible to use DC to DC converters as DC transformers for very high voltage?
A: a transformer input will always demand an AC input a DC input may actually damage it if enough power is available
How BJT works as a amplifier?
aplied weak input signal is amplied at output side due to very high resistence
What are the properties of an op-amp?
Properties of an op-amp are as follows: 1.Very high open loop gain which remains constant over the frequency range in which the device is to be used. 2.Very high input impedance to minimize the current drawn by the circuit with little losses. 3.Very low output impedance 4. They are stable, i.e. not liable to burst into parasitic oscillation. 5. They are free from drift caused by ambient temperature changes.
What is the impedence?
Impedance is the complex form of resistance. Impedance takes into account capacitance and inductance in a circuit as well. Impedance can be represented as resistance as a function of frequency.See link.AnswerImpedance is not a 'complex form of resistance'. It is the vector sum of a circuit's resistance and reactance. In electrical engineering, 'resistance' has a very specific meaning, and cannot be used to denote 'opposition'.
Why input resistance of voltage amplifier is infinity?
For the successful amplification of the input signal the opamp should have ideally infinite input impedance . It should act like a buffer amplifierBUFFER amplifier--------------------->1.input impedance infinity2.output impedance zerothe reason is thatAny signal source will have source impedancefor the signal not to get lost and dropped across source impedance we ideally insert infinite impedance in series with it which makes the whole drop across the infinite impedance but not across the sourcesimilarly at the output zero impedance is used where in no part of the signal should be left behind in the op amp as a drop
