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Thursday, July 29, 2010

SPM Physics: Logic gates

Yesterday i teach one of my weakest student   logic gates concept. He is the type who has problem to understand physics concept properly. Somehow, when i showed him a concept of logic gates, he tends to be addicted doing logic gates exercises... This shows that he is actually good in logical thinking.

Logic gates is actually a very simple concept learned in Electronics. In fact i can say that it is one of the easiest subtopic provided if u are able to think 'LOGIC' :)
However u need to understand the following basic logic gates i.e NOT,AND,OR,NAND and NOR.
U must be able to construct the truth tables for those gates. Truth table helps us to undderstand the behavior of the logic gates. In other words, it shows how the input of a logic gates relate to its output.

Usually students a are a bit blurred on this topic coz they wondered what is actually  '1' or '0' means?
keep in mind most of computerised devices work on electrical flow where a HIGH voltage is considered as '1' and LOW voltage as '0'. Logically, it is sorts of a switching system which requires some inputs in order to produce an output.



In SPM, u need to practise lots ofpaper2 questions on application of logic gates. Usually the question can be tricky..so u must really understand the condition explained in the application.
When actually they apply this logic gate concept??

Well i can give u a simple example.. if u used to wash your clothes using washing machine..we can create a LOGIC input for the machine which looks like this:
to rotate the motor, we need to fill in the water untill to a certain level. Once the water rises to that level..the input will be '1'... but some how it still not rotated...kenapa ya? Ops, may be you lupa nak tutup the 'top cover'. Here where the logic gates play its role..the rotating motor represents the output  which depends on the input of the water level & the 'top cover' position. So it needs both input to be '1', then baru dia rotate..
Thus we can use AND gate in this application.

U can Watch this video to improve your basic understanding on logic gates

1 comment:

durianlipat said...

kool gile the xplanation mesin basoh 2!each tyme baso baju i'll try 2 remember it

2011 Physics Trial Paper

Terengganu P1 P2 P3 (no answer scheme)



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2010 Physics Trial Paper

SBP 2010 [ P1 ] [ P2 ] [ P3 ] [ ANS. SCHEME ]

SABAH 2010 [ P1 ] [ P2 ] [ P3 ]

JOHOR 2010 [ P1,P2,P3 ]

TERENGGANU 2010 [ P1 ] [ P2 ] [ P3 ] [ ANS. SCHEM]

MELAKA 2010 [ P1,P2,P3 ]

PERLIS 2010 [ P1 ] [ P2 ] [ P3 ] [ ANS. SCHEM]

S'NGOR 2010 [ P1 ] [ P2 ] [ P3 ] [ ANS. SCHEM]

KEDAH 2010 [ P1 ] [ P2 , P3 ] [ ANS. SCHEM]

* credit goes to all the teachers who are willing to share these papers on the net

2009 Physics Trial Paper

SPM Physics 2009 Trial Paper:

1. Perlis 2009 [Marking scheme]
2. SBP2009 / P1 / P2 / P3 /Marking Scheme (credit to cikgu suriati)
3. Sabah 2009
4.Johor 2009

5. Pahang { P1 } {P2} {P3}
6. Kelantan 2009
7. Terengganu 2009

8. Selangor [ P2 ] [ P3 ] [
Skema ]
9. Negeri 9 [ P2 ] [ P3 ] [ Skema ]

10. Kedah [ P1 ] [P2 ] [ P3 ] [ SKEMA ]
11. MRSM [ P1 ] [ P2 ] [ P3 ]
12. Perak [ P2 ] [ Skema ]

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