Lamp (lighting)

 

A transducer, which converts electrical energy to light. This symbol isused for a lamp providing illumination, for example a car headlamp.Lamp (indicator)A transducer which converts electrical energy to light. This symbol isused for a lamp which is an indicator, for example a warning light on acar dashboard.HeaterA transducer which converts electrical energy to heat.Motor 

 

A transducer, which converts electrical energy to kinetic energy (motion).Bell A transducer, which converts electrical energy to sound.Buzzer  A transducer, which converts electrical energy to sound.Inductor (Coil, Solenoid) A coil of wire, which creates a magnetic field when current, passesthrough it. It may have an iron core inside the coil. It can be used as atransducer converting electrical energy to mechanical energy by pullingon something.

SwitchesComponent Circuit Symbol Function of Component

Push Switch(push-to-make) A push switch allows current to flow only when the button is pressed.This is the switch used to operate a doorbell. It is a abbreviated NOfor normally open .Push-to-BreakSwitch This type of push switch is normally closed abbreviated NC for normally closed (on), it is open (off) only when the button is pressed.On-Off Switch(SPST) SPST = Single Pole, Single Throw.An on-off switch allows current to flow only when it is in the closed(on) position.2-way Switch(SPDT) SPDT = Single Pole, Double Throw.A 2-way changeover switch directs the flow of current to one of tworoutes according to its position. Some SPDT switches have a centraloff position and are described as 'on-off-on'.Dual On-Off Switch(DPST) DPST = Double Pole, Single Throw.A dual on-off switch, which is often used to switch mains electricitybecause it can isolate both the live and neutral connections.ReversingSwitch(DPDT) DPDT = Double Pole, Double Throw.This switch can be wired up as a reversing switch for a motor. SomeDPDT switches have a central off position.