[Ari Ben Canaan]

http://www.xtremepapers.com/CIE/Inte..._w09_qp_41.pdf

Page 15 part (i) (ii)

Is this the correct answer ?

[Ari Ben Canaan]

bump

[Stonebridge]

As they are ideal diodes, the pd across them will be zero when conducting, and equal to the applied voltage when not.

[Ari Ben Canaan]

(Original post by Stonebridge)
As they are ideal diodes, the pd across them will be zero when conducting, and equal to the applied voltage when not.

So diagram 1 will be shifted half a cycle to the right and diagram 2 will be shifted half a cycle to the left ?

[Stonebridge]

(Original post by Ari Ben Canaan)
So diagram 1 will be shifted half a cycle to the right and diagram 2 will be shifted half a cycle to the left ?

Diode A will have zero pd when the cycle is positive, and follow the supply voltage (reverse biased) when that goes negative.
Diode B is facing the other way, so it will have zero pd when the cycle is negative, and be reverse biased when the cycle is positive.

[Ari Ben Canaan]

(Original post by Stonebridge)
Diode A will have zero pd when the cycle is positive, and follow the supply voltage (reverse biased) when that goes negative.
Diode B is facing the other way, so it will have zero pd when the cycle is negative, and be reverse biased when the cycle is positive.

Ah, I see. Since the diodes are ideal they have no resistance hence there is no PD across them when they're conducting.

So I think this should be the final diagram.

[Stonebridge]

(Original post by Ari Ben Canaan)
Ah, I see. Since the diodes are ideal they have no resistance hence there is no PD across them when they're conducting.

So I think this should be the final diagram.

Yes. That's the one I would go for.

[Ari Ben Canaan]

(Original post by Stonebridge)
Yes. That's the one I would go for.

Thanks Stonebridge !

[bmqib]

(Original post by Stonebridge)
Yes. That's the one I would go for.

but they would be curves right? and not straight lines?

[Stonebridge]

(Original post by bmqib)
but they would be curves right? and not straight lines?

Yes of course. I assumed that the diagram was meant to be curved as it's easier to draw straight lines with paint than to get the sine wave shape.

So no straight lines in the answer, except for the flat zero lines where the diode conducts.

Hope that's clear now.

[Ari Ben Canaan]

(Original post by bmqib)
but they would be curves right? and not straight lines?

I couldnt be bothered to draw in curved lines so I just drew straight ones in.