知道【zhī dào】
know; realize; be aware of
[动] 晓得,对事物有所了解、认识

您知道您踩着我的脚了吗?
Are you aware that you are stepping on my foot?
知觉【zhī jué】
1. perception 2. consciousness
[名]1、人对客观事物各个部分或属性的整体反映 2、感觉

机器人没有知觉,也没有自己的思维。
Robot has neither perception nor its own thoughts.

虽然伤的很重,但我还有知觉。
Though severely hurt, I still had consciousness.
知识【zhī shi】
1. knowledge 2. intellectual
[名]1、人们在实践中获得的认识和经验 2、指有关文化学术的

知识就是力量。
Knowledge is power.

知识界对宇宙的来源还没有定论。
The intellectual community is still unsure about the origin of the universe.