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Input is electricity and output is sound, heat and light.
Depends on what you're referring to. Input could be a switch for example, output would be a fan or light coming on. Eating is an input, you can guess what your output is?
Input to light bulb is Electricity and output is light.
Light Pen is an input Device.
Light Pen is an input Device.
Light Pen is an input Device.
A output switch is a light switch just with a different name.
Assuming that a sensor (any type, heat, light, sound etc) is connected to something - eg a computer or a switch etc. it is an 'input' device. The device which created whatever is being 'sensed' is an output device. For example if you put a thermometer next to a light bulb to see how hot it is then the bulb is 'output' and the thermometer is 'input'.
You could call the operating system thwarting process between input and output. It inputs your commands from keyboard, mouse and voice etc. Then outputs sound from speakers and light from the monitor.
electricity and light
It is an input, sensors are always inputs.
In Light Emitting Diodes when electron jumps from one state to another state it emits some energy in the form of light. And the light will be different for different type of semi conductor materials used for making for it. So, in conclusion Light in LED is a result of output process.