transmission question (2 Viewers)

[mickstarify]

Did you have to calculate everything using the values given? O___O

I just talked about the formulas P: I^2xR and V=IR ...

I Think that was the point of the question, how are you meant to make an assessment on which model is best if you don't calculate the power loss on each

 

[Poops]

with theory

 

[deswa1]

This is what I got (pretty sure its right but open to challenges).

A loses 20MW, B loses 1.6 MW, C loses 3 MW, therefore in order from best to worst is BCA

 

[Demise]

Yeah, you must end your response with a short paragraph (judgement) on which is best and which is the worst. Without it, you would get 1/6.

I think the "which is best" is right, not necessarily the worst, since it specifically asked for the best one. The worst would've just been a benefit.

 

[oh well]

Did you have to calculate everything using the values given? O___O

I just talked about the formulas P: I^2xR and V=IR ...

That's what I did, I am sure we will at least get 2 marks

 

[someth1ng]

This is what I got (pretty sure its right but open to challenges).

A loses 20MW, B loses 1.6 MW, C loses 3 MW, therefore in order from best to worst is BCA

This is correct.

 

[nerdasdasd]

I forgot one decimal point....................

 

[jamesischool]

in my response i said something like 'a in comparison to b has a higher current which transmits over the same distance. the power loss is therefore greater - roughly all i mentioned for a'. i then went on to compare B and C, found that B was 1.6 whilst C was 3 and said that B was the best despite C having 0 resistance (needs the coolant power which makes it less efficient).

 

[lolcakes52]

I just calculated power loss, I think B had teh lowest so I rolled with that.

 

[Stealth_Mel0n]

same

 

[xmichaelpham]

Yeah, you must end your response with a short paragraph (judgement) on which is best and which is the worst. Without it, you would get 1/6.

actually you would lose 1 mark for not evaluating which is the best. You wouldn't get 1/6 for not writing a last concluding statement on which is the best lol

 

[someth1ng]

actually you would lose 1 mark for not evaluating which is the best. You wouldn't get 1/6 for not writing a last concluding statement on which is the best lol

Actually, in the HSC marking schemes, you are capped at 1/6 (usually) for not including a proper judgement.

Q27 HSC 2010, no judgement is maximum of 4/6.
Q22 HSC 2009, no judgement is maximum of 1/5.

It depends partly on your luck but you CAN lose all but 1 mark just because you didn't include a judgement.

 

[mickk794]

I had no idea, but i made up some bs and ended up putting Design B with explanations why.
Im so happy that you all think B aswell.