### device | electrical device | transformer:

Variable transformer
* control the temperature on many laboratory heating devices.
* vary the amount of output voltage delivered to a circuit.

### device | electrical device:

Transponder
* Some transponders operate as debit cards.
* actually communicate with each other using acoustic, or sound signals.
* are also susceptible to magnetic fields
  - electrical devices
  - minute chips that can come in the form of radio frequency identification tags
  - wallet-sized electronic devices that clip to the car's sun visor
* convert any input signal to an output signal with a well-defined wavelength.
* is an electrical device
* vary both in terms of power and operating channels.

### device | electrical device | zapper:

Bug zapper
* are great for ridding summer nights of mosquitoes
  - useless against mosquitoes
* do indeed kill some mosquitoes.
* kill a lot of insects if they fly in that direction
  - insects, but very few of the insects killed function as pests

### device:

Electronic device
* All electronic devices emit some low level electromagnetic radiation
  - have many electrical connections throughout the device
  - reproduce color differently
  - use microelectronic packages or integrated circuits in order to function
* Many electronic devices reduce stuttering.
* Many electronic devices use small rubber bands
  - the ground as a reference
* Most electronic devices make sound.
* Most electronic devices require power
  - voltage
* Some electronic devices contain materials
  - have computer chips in ignition keys
* Some electronic devices require a direct rather than alternating current
  - magnets
  - transform energy
* account for about half of sales.
* are available which monitor the heart rate and breathing of sleeping babies
  - complex, expensive, and cumbersome
  - especially helpful in locating fish
  - high in cognitive friction
  - in widespread use in everyday life
  - necessary to detect most of the longer waves, such as radio waves
  - products
  - the building blocks of all electronic circuitry
* can interfere with aircraft electronic systems
  - only be portable if they maintain their own, self-sufficient power source
* depend on the properties of solids with extended structures.
* generate sound waves, which stimulate the gas to alternately expand and contract.

### device | electronic device:

Beeper
* are electronic devices
  - small plastic cones that emit a quiet beeping noise
* is an electronic device

Computer mouse
* Computer mice use two slotted disks that are rotated by the track ball.
* are located in desktops
  - mouse pads
  - made of plastic

### device | electronic device:

Defibrillator
* Most defibrillators deliver a monophasic voltage, which can be pictured as half of a sine wave.
* are a common sight in most medical settings
  - cheap and easy to use
  - common devices in hospital emergency rooms and some ambulance squads
  - devices that use electrical shock to restart and stabilize a heart beat
  - found on board many commercial airlines
  - medical devices
* assess heart rhythm and provide shock treatment.
* can also reduce the amount of time that people spend in an abnormal rhythm
  - help people, but only within about the first ten minutes of a heart attack
  - jolt a heart into beating again
  - restore a normal heart rhythm in persons suffering form sudden cardiac arrest
* deliver a shock to restore normal rhythms
  - an electric shock that restarts the heart in cardiac arrest victims
  - electric shocks that stimulate the heart to resume normal beating
  - electrical shocks that can re-establish heart rhythm
* give an electric shock to the heart which jolts it back into life.
* shock the heart back into a normal rhythm.
* tend to synchronize the heart's electrical system.