Difference between revisions of "IV Graph"
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| + | |[[File:IVGraphResistor.png|center|300px]] | ||
| + | |[[File:IVGraphBulb.png|center|300px]] | ||
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| + | | style="height:20px; width:200px; text-align:center;" |The '''IV graph''' for a [[resistor]] shows that [[Electrical Current|current]] is [[Directly Proportional|directly proportional]] to [[Potential Difference|potential difference]]. | ||
| + | | style="height:20px; width:200px; text-align:center;" |The '''IV graph''' for a [[Electrical Bulb|bulb]] shows that as the [[Potential Difference|potential difference]] increases the [[Electrical Current|current]] increases. However, at large [[Potential Difference|potential differences]] a change in [[Potential Difference|potential difference]] causes a smaller increase in [[Electrical Current|current]] for a change at small [[Potential Difference|potential differences]]. | ||
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| + | |[[File:IVGraphDiode.png|center|300px]] | ||
| + | |[[File:IVGraphLDR.png|center|300px]] | ||
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| + | | style="height:20px; width:200px; text-align:center;" |The '''IV graph''' for a [[diode]] shows that for a positive [[Potential Difference|potential difference]] the [[Electrical Current|current]] increases rapidly with an increase in [[Potential Difference|potential difference]] while for a negative [[Potential Difference|potential difference]] the [[Electrical Current|current]] remains negligible and does not increase as the [[Potential Difference|potential difference]] becomes larger. | ||
| + | | style="height:20px; width:200px; text-align:center;" |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]] whereas at a low [[light]] intensity the [[Electrical Current|current]] increases slowly with the [[Potential Difference|potential difference]]. | ||
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Revision as of 14:35, 28 February 2019
Key Stage 4
Meaning
An IV graph is a graph showing how the current (I) through a component changes with the potential difference (V) across component.
About IV Graphs
- On an IV graph the potential difference is plotted on the x-axis and the current is plotted on the y-axis.
- An IV graph can be used to identify the characteristics of an unknown electrical component. This may be useful when inventing new components.
- The resistance of an component can change with the current or the potential difference.
- The resistance of a component can be found by taking the ratio of potential difference to current at a point on the curve of an IV graph.
Examples
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| The IV graph for a resistor shows that current is directly proportional to potential difference. | The IV graph for a bulb shows that as the potential difference increases the current increases. However, at large potential differences a change in potential difference causes a smaller increase in current for a change at small potential differences. |
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| The IV graph for a diode shows that for a positive potential difference the current increases rapidly with an increase in potential difference while for a negative potential difference the current remains negligible and does not increase as the potential difference becomes larger. | The IV graph for a light dependent resistor shows that at a high light intensity the current increases rapidly with the potential difference whereas at a low light intensity the current increases slowly with the potential difference. |