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# IAL Physics unit 3 Jan 2015 exam watch

1. i think its v against I

because he gave us the power which is 24 W and potential difference 12 V

we just need to to find current .
2. (Original post by exztra)
What was the 4th part? I dnt remembr

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How do you use these measures to sketch a graph?
3. (Original post by hhalai96)
i also drew V against I .....
how was the circuit diagram?
A circuit with a ammeter , bulb , variable resistor in series and the voltmeter in parallel.
4. (Original post by exztra)
i drew a voltmtr an ammetr a variable resistor, cells and switch, nd yes, bulb ofcrse, what did u ppl draw? i did not label anything

i drew a bulb ammeter voltmeter and power supply...
and bulb

because it was how resistance varies with potential difference..
so with power supply you can change the voltage
measure voltage across bulb and measure current
draw a graph of v against i

this was how i thought
5. (Original post by Hanojhan)
How do you use these measures to sketch a graph?
Measure R frm V nd I nd thn plot a graph of R against V, thtz wht i wrote

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6. (Original post by exztra)
Measure R frm V nd I nd thn plot a graph of R against V, thtz wht i wrote

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Exactly what i did yay
7. (Original post by exztra)
Measure R frm V nd I nd thn plot a graph of R against V, thtz wht i wrote

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I wrote a graph of V against I
8. Anyone got the mark scheme?

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