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| style="height:20px; width:200px; text-align:center;" |In this [[Circuit Diagram|circuit diagram]] the [[light]] intensity is low, which causes the [[Electrical Resistance|resistance]] of the '''LDR''' to be high. As a result the [[Potential Difference|potential difference]] across the [[electrical bulbBulb|lamp]] will be high (5.9V) and the [[Electrical Current|current]] through the [[Electrical Bulb|lamp]] will be large. So in dim [[light]] the [[Electrical Bulb|lamp]] will remain unlitlit.| style="height:20px; width:200px; text-align:center;" |In this [[Circuit Diagram|circuit diagram]] the [[light]] intensity is high, which causes the [[Electrical Resistance|resistance]] of the '''LDR''' to be low. As a [[result]] the [[Potential Difference|potential difference]] across the [[electrical bulbBulb|lamp]] will be low (0.1V) and the [[Electrical Current|current]] through the [[Electrical Bulb|lamp]] will be low. So in bright [[light]] the [[Electrical Bulb|lamp]] will remain unlit.|} ===IV Graph==={| class="wikitable"|[[File:IVGraphLDR.png|center|400px]]|} ====Description====The [[IV Graph]] for a [[Light Dependent Resistor|light dependent resistor]] shows that:*At a high [[light]] intensity the [[Electrical Current|current]] increases rapidly with the [[Potential Difference|potential difference]]*At a low [[light]] intensity the [[Electrical Current|current]] increases slowly with the [[Potential Difference|potential difference]]. ====Explanation====: The [[Electrical Resistance|resistance]] of an '''LDR''' increases as the [[light]] intensity decreases. ====Obtaining the IV Graph===={| class="wikitable"|-|[[File:LDRIVGraphCircuit.png|center|300px]]| style="height:20px; width:300px; text-align:left;" |#Connect an [[ammeter]] in [[Series Circuit|series]] with the '''LDR''' to measure [[Electrical Current|current]] through the '''LDR'''.#Connect a [[voltmeter]] in [[Parallel Circuit|parallel]] with the '''LDR''' to measure the [[Potential Difference|potential difference]] across it.#Use a [[Variable Resistor|variable resistor]] in [[Series Circuit|series]] with the '''LDR''' to vary the [[Potential Difference|potential difference]] across the '''LDR'''.#Cover the '''LDR''' so that very little light reaches its surface.#Start with a [[Potential Difference|potential difference]] of zero and increase the [[Potential Difference|potential difference]] by an interval of 0.2V up to 2V.#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]].#Repeat steps 5-7 while shining a constant bright [[light]] on the '''LDR'''