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Electricity
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Question | Answer |
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What does a straight line through the origin indicate | The voltage and current are directly proportional and resistance is constant |
What does a steep gradient indicate | Low resistance as a large current will flow for a small p d |
What does a shallow gradient indicate | High resistance as a large p d is needed to produce a small current |
What results as a non linear graph | For some resistors the value of R is not constant but changes as the current changes |
Name the considerations u need to make when investigating the characteristics of a filament lamp a diode and a resistor at constant temperature | Before taking a measurement check the voltage and current with the power supply turned off this will alow zero errors to be identified |
Another? | Reading the supply voltage across the component. At a low component resistance the wire will take a sizeable share of the voltage resulting in a lower voltage this is why a voltmeter is used to measure the voltage across the component |
what is the independent variable of this practical | The potential difference across the component set by the variable resistor |