Resistors (AQA GCSE Physics Combined Science): Flashcards
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15 cards from this deck
What is an ohmic conductor?
What is an ohmic conductor?
Component with constant resistance
Ohmic conductor graph shape
Ohmic conductor graph shape
Linear
Are lamps, diodes, thermistors, LDRs ohmic?
Are lamps, diodes, thermistors, LDRs ohmic?
No - resistance not constant (nonlinear graphs)
Filament lamp resistance vs temperature
Filament lamp resistance vs temperature
Resistance increases as temperature increases
Diode current flow direction
Diode current flow direction
One direction only
Diode resistance in reverse direction
Diode resistance in reverse direction
Very high resistance
Higher resistance effect on energy transfer
Higher resistance effect on energy transfer
More energy is transferred
Current vs P.D. for ohmic conductor
Current vs P.D. for ohmic conductor
Directly proportional
Why does resistance increase with current?
Why does resistance increase with current?
Electrons collide with atoms, causing more vibration
Thermistor in hotter temperature
Thermistor in hotter temperature
Lower resistance
LDR with greater light intensity
LDR with greater light intensity
Lower resistance
LDR resistance when dark
LDR resistance when dark
Greatest (highest resistance)
Greater length effect on resistance
Greater length effect on resistance
More resistance, lower current
LED function when current flows
LED function when current flows
Gives off light
LED energy efficiency
LED energy efficiency
Extremely energy-efficient