234UncleBob
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Done a past paper, 67% , but I guess the main thing is to keep learning from them.

Question Paper:
https://pmt.physicsandmathstutor.com...%20A-Level.pdf
Mark Scheme:
https://pmt.physicsandmathstutor.com...%20A-Level.pdf

Question 4.3, I know you're meant to use the Potential divider formula, I know how to use it, but i don't know what and where they plugged in the numbers the used and it's stating to stress me, help would be appreciated, just to get me to 0.313k ohms, I feel like I know what to do from there.

Many Thanks!!
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Smokestar
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Do you know how they did question 5 part 1. Im so stuck on it
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Joinedup
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You aren't *meant* to use the potential divider formula, it's one of the options - as an equally valid alternative method the MS shows that you could calculate the required current through the 250 Ω resistor. (when Vout is 5V the pd across the 250Ω resistor must be 4V because Vout and the pd across the 250Ω have got to add up to the 9V supply)
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