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→IV Graph
: [[Wire]]s (like the [[filament]]) have a greater [[Electrical Resistance|resistance]] at higher [[temperature]]s, causing the increase in [[Electrical Current|current]] to be reduced.
:: This is because the more the [[ion]]s in the [[metal]] [[lattice]] [[vibrate]] the more likely [[electron]]s are to [[collide]] with them and slow down.
====Obtaining the IV Graph====
{| class="wikitable"
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|[[File:BulbIVGraphCircuit.png|center|300px]]
| style="height:20px; width:300px; text-align:left;" |
#Connect an [[ammeter]] in [[Series Circuit|series]] with the '''bulb''' to measure [[Electrical Current|current]] through the '''bulb'''.
#Connect a [[voltmeter]] in [[Parallel Circuit|parallel]] with the '''bulb''' to measure the [[Potential Difference|potential difference]] across it.
#Use a [[Variable Resistor|variable resistor]] in [[Series Circuit|series]] with the '''bulb''' to vary the [[Potential Difference|potential difference]] across the '''bulb'''.
#Start with a [[Potential Difference|potential difference]] of zero and increase the [[Potential Difference|potential difference]] by an interval of 1V up to 10V.
#Recording the reading on the [[voltmeter]] and [[ammeter]].
#Reverse the connections on the [[battery]] and repeat steps 4 and 5 to find the I-V relationship for negative [[Potential Difference|potential difference]] and [[Electrical Current|current]].
|}