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A levels Physics notes needed?

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To make a potentiometer, a driver cell of 4.0 V is connected across a 1.00 m length of resistance wire.
a. What is the potential difference across 1 cm length of wire? What length of wire has p.d. of 1.0 V across it?
b. A cell of unknown e.m.f E is connected to the potentiometer and the balance point is found at a distance of 37.0 cm from the end of the wire to which the galvanometer is connected. Estimate the value of E. Explain why this can only be an estimate.
c. A standard cell of e.m.f 1.230 V gives a balance length of 31.2 cm Use this value to obtain a more accurate value for E.
 
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i want notes of waves and electricity ..if someone is having plz post the link ..
 
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I have some waves notes, they're scanned so they won't be perfect. If you want, I can mail them to you?
 
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