Actuators

These are devices that can generate physical movements from signals sent by computers.   

These signals can be sent through wireless (remote) transmission or through cables.  There are at least four types of actuators and these are:
  Motors (produce the most accurate movement)
  Hydraulics (use oil and are the most powerful)
  Pneumatics (use gas and are the fastest)
Solenoids (their movement can be used to open gates/locks or to control the flow of gases and liquids in pipes)

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