Systems and Control- inputs ,process and outputs

Question

1) public address system - input ?
2)table lamp - process ?
3) street lamp - input ?
4)burgular alam - process?
5)doorbell-output-doorbell sounds (ding dong is this right?)
6)car windscreen - input-?
7)refrigerater- output- cold air ( is this right ?)
8)calculator- input?
9)kitchen timer - process?
10)automatic night light - output - light comes on at set time ( is this right ?)
thanks for you help

Answer 1

I will do a couple. You need to do your own thinking.

1)public address system
input:voice message
process: amplification, and distribution to speakers
output: loud message at selected sites.

7) refrigerator: Input: temperature sensor
Process: When internal temp is above preset temp, turn on refergerator compressor
Output: Cold box with temp below a preset.

10) auto night light.
Input: light sensor sensiing light
Process: if ambient light is below threshold, turn on light.
Output: light on or off

Answer 2

thanks that's great! they were the main ones i was stuck on.thanks again

Answer 3

ok what is the burglar system ?