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# Electricity

### HELP ME

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
Created by: Amy Binks

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