Investigating Resistance in Thermistors & LDRs (OCR GCSE Physics A, Combined (Gateway Science Suite)): Flashcards
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Thermistor definition
Thermistor definition
Resistor that responds to temperature changes
What happens to thermistor resistance as temperature increases?
What happens to thermistor resistance as temperature increases?
Decreases
LDR full name
LDR full name
Light-dependent resistor
What happens to LDR resistance as light intensity increases?
What happens to LDR resistance as light intensity increases?
Decreases
Purpose of sensing circuits
Purpose of sensing circuits
Vary resistance to control current through a component
Components used in sensing circuits
Components used in sensing circuits
Thermistor or LDR
Thermistor use when cold
Thermistor use when cold
Switch on a heater
Thermistor use when hot
Thermistor use when hot
Activate a fan
LDR resistance when dark
LDR resistance when dark
High
Potential difference across LDR when dark
Potential difference across LDR when dark
High
Bulb brightness with LDR in dark
Bulb brightness with LDR in dark
Brighter
Bulb energy in dark (LDR circuit)
Bulb energy in dark (LDR circuit)
More energy
LDR resistance in bright light
LDR resistance in bright light
Low
Bulb brightness in bright (LDR circuit)
Bulb brightness in bright (LDR circuit)
Dimmer