For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves.

For example, in sound recording, fluctuations in air pressure ( that is to say, sound ) strike the diaphragm of a microphone which induces corresponding fluctuations in the current produced by a coil in an electromagnetic microphone, or the voltage produced by a condensor microphone.

Expansion boards were made by Richmond Sound Design that allow their show control and sound design software to communicate with their custom hardware frames either by ribbon cable or fiber optic cable for long distances, allowing the Amiga to control up to eight million digitally controlled external audio, lighting, automation, relay and voltage control channels spread around a large theme park, for example.

For example, an audio amplifier with a gain given as 20 dB will have a voltage gain of ten ( but a power gain of 100 would only occur in the event the input and output impedances were identical ).

Biomedical instrumentation amplifier schematic used in monitoring low voltage biological signals, an example of a biomedical engineering application of electronic engineering to electrophysiology.

However, a tall building brings a lot of difficulties to structural and building services design, for example, excessive system static pressure for water systems, high line voltage drop and long distance of vertical transportation.

For example, diodes are used to regulate voltage ( Zener diodes ), to protect circuits from high voltage surges ( avalanche diodes ), to electronically tune radio and TV receivers ( varactor diodes ), to generate radio frequency oscillations ( tunnel diodes, Gunn diodes, IMPATT diodes ), and to produce light ( light emitting diodes ).

For example, diodes are used in ( stepper motor and H-bridge ) motor controller and relay circuits to de-energize coils rapidly without the damaging voltage spikes that would otherwise occur.

An example is the comparator which takes in a continuous range of voltage but only outputs one of two levels as in a digital circuit.

For example, a transconductance amplifier has a gain with units of conductance ( output current per input voltage ).

So an amplifier that is said to have a gain of 20 dB might have a voltage gain of ten times and an available power gain of much more than 20 dB ( 100 times power ratio ), yet be delivering a much lower power gain if, for example, the input is a 600 ohm microphone and the output is a 47 kilohm power amplifier's input socket.

The exact choice of quiescent current, the standing current through both devices when there is no signal, makes a large difference to the level of distortion ( and to the risk of thermal runaway, that may damage the devices ); often the bias voltage applied to set this quiescent current has to be adjusted with the temperature of the output transistors ( for example in the circuit at the beginning of the article the diodes would be mounted physically close to the output transistors, and chosen to have a matched temperature coefficient ).

The first example of such a use comes from the work of the physicist Gustav Kirchhoff, who published in 1845 his Kirchhoff's circuit laws for calculating the voltage and current in electric circuits.

Analog computers take advantage of the strong similarities between the mathematics of small-scale properties — the position and motion of wheels or the voltage and current of electronic components — and the mathematics of other physical phenomena, for example, ballistic trajectories, inertia, resonance, energy transfer, momentum, and so forth.

For example, suppose a process commands that a computer card's voltage output be set high-low-high-low and so on at a rate of 1000 Hz.

For example, in a non-inverting amplifier ( see the figure on the right ) adding a negative feedback via the voltage divider R < sub > f </ sub >, R < sub > g </ sub > and the differential to single ended conversion is completed without gain losses.

A zero voltage level detector ( E < sub > i </ sub > = 0 ) can convert, for example, the output of a sine-wave from a function generator into a variable-frequency square wave.

Linux uses, for example, various system timings ( like user keystrokes, I / O, or least-significant digit voltage measurements ) to produce a pool of random numbers.

For example, a 1 cm < sup > 3 </ sup > cube of quartz with 2 kN ( 500 lbf ) of correctly applied force can produce a voltage of 12500 V.

The collector voltage drops because of the collector load resistance ( in this example, the resistance of the light bulb ).

As a simple example, if the voltage across the thermistor is held fixed, then by Ohm's Law we have and the equilibrium equation can be solved for the ambient temperature as a function of the measured resistance of the thermistor:

In the example characteristic shown on the image, if an anode voltage V < sub > a </ sub > of 200 V and a grid voltage bias of-1 volt are selected, a plate ( anode ) current of 2. 25 mA will be present ( using the yellow curve on the graph ).

An example of the changes which have crept over the Southern region may be seen in the Southern Negro's quest for a position in the white-dominated society, a problem that has been reflected in regional fiction especially since 1865.

Although biopsies have shown structural changes in some of the reported cases of steroid-induced weakness, this case provides the only example known to us in which necropsy afforded the opportunity for extensive study of multiple muscle groups.

The most notable example has been the objection of many provinces of the Communion ( particularly in Africa and Asia ) to the changing role of homosexuals in the North American churches ( e. g., by blessing same-sex unions and ordaining and consecrating gays and lesbians in same-sex relationships ), and to the process by which changes were undertaken.

For example, changes in signal strength may be used to specify the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels.

Bolivian Sign Language, for example, is essentially ASL, apart from changes in initialized signs to make them match the spelling of Spanish.

For example, if a single photon strikes the electrons, only a single electron changes states in response to the photon.

This is an example of renormalization in quantum field theory — the field theory being necessary because the number of particles changes from one to two and back again.

Some distinctive accents can be found on the East Coast ( for example, in eastern New England and New York City ) partly because these areas were in close contact with England and imitated prestigious varieties of British English at a time when these were undergoing changes.

For example, cold weather crops like rye, oats, wheat, and apples are expected to decline by about 15 % in the next fifty years and strawberries will drop as much as 32 % simply because of projected climate changes of a few degrees.

For example, during the menstrual cycle, the breasts are enlarged by premenstrual water retention ; during pregnancy the breasts become enlarged and denser ( firmer ) because of the prolactin-caused organ hypertrophy, which begins the production of breast milk, increases the size of the nipples, and darkens the skin color of the nipple-areola complex ; these changes continue during the lactation and the breastfeeding periods.

For example, germline therapy changes the genetic make-up of an individual's descendants.

* A solar calendar is based on perceived seasonal changes synchronized to the apparent motion of the Sun ; an example is the Persian calendar.

Many Earth plants and animals undergo major biochemical changes during their life cycles as a response to changing environmental conditions, for example, by having a spore or hibernation state that can be sustained for years or even millennia between more active life stages.

For example, Leon Trotsky believed that central planners, regardless of their intellectual capacity, operated without the input and participation of the millions of people who participate in the economy and understand / respond to local conditions and changes in the economy would be unable to effectively coordinate all economic activity.

Loosely speaking, a derivative can be thought of as how much one quantity is changing in response to changes in some other quantity ; for example, the derivative of the position of a moving object with respect to time is the object's instantaneous velocity.

For example, small differences in color are more difficult to perceive than are changes in brightness.

* Dynamic DNS ( sometimes called DDNS ) allows clients to update their DNS entry as their IP address changes, as it does, for example, when moving between ISPs or mobile hot spots.

For example, changes in the internal level do not affect application programs written using conceptual level interfaces, which saves substantial change work that would be needed otherwise.

However, with changes in the model specification such as, in this example, hybrid gas-electric cars, rules may need to change.

Another example involves the vowel differences ( with accompanying stress pattern changes ) in several related words.

However, most of these projects are specific to individual nationalities ( riism from English speakers, for example ), and the only changes that have gained acceptance in the Esperanto community have been the minor and gradual bottom-up reforms discussed in the last section.

An example of these changes is the Lotus Sutra.

If the primary variable is mass fraction (, given, for example, in ), then the equation changes to:

For example, in Il Barbiere there is an aria for the Count ( often omitted ) " Cessa di più resistere ", which Rossini used ( with minor changes ) in the cantata Le Nozze di Teti e di Peleo and in La Cenerentola ( the cabaletta for Angelina's rondo is almost unchanged ).