Required Practical: Investigating I–V Characteristics (OCR GCSE Physics A, Combined (Gateway Science Suite)): Flashcards
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11 cards from this deck
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Practise the cards
11 cards from this deck
Formula for resistance
Formula for resistance
Relationship between resistance and wire length
Relationship between resistance and wire length
Directly proportional
Zero error definition
Zero error definition
Systematic error; reading on instrument when value should be zero
How to correct for zero error in resistance
How to correct for zero error in resistance
Subtract the zero error from all readings
Effect of temperature increase on wire resistance
Effect of temperature increase on wire resistance
Resistance increases
How to reduce heating in wire (P.D.)
How to reduce heating in wire (P.D.)
Use a low P.D. to keep current low
What I-V characteristic curve shows
What I-V characteristic curve shows
Relationship between current through & voltage across component
Shape of I-V graph for a resistor
Shape of I-V graph for a resistor
Straight line
What linear I-V relationship indicates
What linear I-V relationship indicates
Ohm's law is obeyed
I-V characteristic of a diode
I-V characteristic of a diode
Allows current in one direction only; curved
I-V characteristic of filament bulb
I-V characteristic of filament bulb
Curve; resistance increases as temperature rises