# Potential dividers question physics???

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#1
Can anyone explain questions 5(iii) and 5(iv) from this worksheet on physics and maths tutor? Obviously I've seen the answers but don't understand how you work to get them.

For part 5(iii) doesn't the mark scheme give the total of the p.d. across both the 2.2k resistor and the 8.0k resistor?

And for part (iv), why is the maximum current produced by the potential divider 1.1mA?

The link to the questions are here: https://pmt.physicsandmathstutor.com...vider%20QP.pdf

https://pmt.physicsandmathstutor.com...vider%20MS.pdf
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4 months ago
#2
Yes. The 2.2k and the 8k resistors are in parallel. The total combined resistance was found from the parallel resistors formula. The pd is the same across both and is 4.4V between A and B

Because that is current you get if you reduce the value of the 4k resistor to zero, and apply Ohm's Law to the 9V and 8k resistor.
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#3
(Original post by Stonebridge)
Yes. The 2.2k and the 8k resistors are in parallel. The total combined resistance was found from the parallel resistors formula. The pd is the same across both and is 4.4V between A and B

Because that is current you get if you reduce the value of the 4k resistor to zero, and apply Ohm's Law to the 9V and 8k resistor.
Thank so much for the help! I understand it a lot better now
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