Electronics SAC Advice?

[Lols123]

Hey guys

I have my SAC on tuesday, but I'm not really sure what to study as most of the Heinemann stuff is useless i.e. the skin effect stuff and all the transistor stuff

so if anyone had any tips on what kinda stuff i should memorize/practice that would be great
also if any of you have done yours at school..was there alot of theory? :S

[Lasercookie]

What kind of SAC is it?

If it's a test, I would probably kill two birds with one stone and just do the electronics section of practice exams.

[Vincezor]

Hey guys

I have my SAC on tuesday, but I'm not really sure what to study as most of the Heinemann stuff is useless i.e. the skin effect stuff and all the transistor stuff

so if anyone had any tips on what kinda stuff i should memorize/practice that would be great
also if any of you have done yours at school..was there alot of theory? :S

Yes I have done mine. I lost 1.5 marks in total (48.5/50, damn) and all of those were half marks from theory questions (yep, I'm mad haha).

The majority of the SAC contained exam-type questions, I'll say maybe just a BIT harder than the ones featured in past VCAA exams. I'd say just do any practice SACs you get from your school or maybe try these: http://vcephysicsandmaths.wikispaces.com/Physics+Unit+3

I have the electronics tests printed out, however I don't think I'll end up doing them due to the short amount of time left I have before the exams (Plus, I'd rather do the electronics part of an exam than a test, more "fulfilling")

[Lols123]

what kind of theory questions were they?
modulation/demodulation?

[Vincezor]

what kind of theory questions were they?
modulation/demodulation?

Typical Themistor/LDR Question: If the resistor value is higher/lower, explain the effect .etc I'm sure you've seen those.

Basic Resistor+LED combination circuit: R is replaced by a resistor of higher resistance. Describe the effect on the light output of the Led.

Explain the difference between the operation of a photodiode and photoconductive mode.

What conditions would a photodiode produce maximum current.

What conditions whould a photodiode produce maximum voltage.

[Lols123]

do you know the answers? imma try to do them for revision

Basic Resistor+LED combination circuit: R is replaced by a resistor of higher resistance. Describe the effect on the light output of the Led.
Would it decrease? R takes a larger share of V..so less V in LED means less light?

Explain the difference between the operation of a photodiode and photoconductive mode.
Photodiodes are used to produce electrical energy when forward biased and to detect changes in light when reversed biased, which is its photconductive mode.

What conditions would a photodiode produce maximum current.
When it is reversed biased with a high light intensity

What conditions whould a photodiode produce maximum voltage.
When it is forward biased.

Sound okay? :S

[b^3]

Basic Resistor+LED combination circuit: R is replaced by a resistor of higher resistance. Describe the effect on the light output of the Led.
Would it decrease? R takes a larger share of V..so less V in LED means less light?

The light output of the LED decreases because the Power output decreases. The increase in resistance of the entire circuit decreases current. As long as the current is still in the range that the LED operates it will have the same voltage as before, but since the current is lower and P=VI the power output decreases and thus the light output decreases.

[Lols123]

ahh k, were the others right then?

and btw, would it it be worth doing only the electricity questions for 2011 exam papers, then doing motion/detailed study later and then marking myself? or would that be a waste?