Какие свойства полупроводников лежат в основе действия: а) терморезисторов; б) фото резисторов?

1 If the light is on, I don't sleep
2 If they don't get enough water. they die
3  My little brother cry, if he sees a dog
4 If we don't do our homework, Mr Lett gets cross
5 The website opens if you type in your password