<Li> Photodiodes, photoresistors, phototransistors, photomultipliers--converts changing light levels into electrical signals </Li> <Li> Photodetector or photoresistor or light dependent resistor (LDR)--converts changes in light levels into changes in electrical resistance </Li> <Li> Cathode - ray tubes (CRT)--converts electrical signals into visual signals </Li> <Li> Electrostatic: <Ul> <Li> Electrometers </Li> </Ul> </Li>

Rotary motion is the output of which electrical output device