resistance, potential difference & circuit devices

potential difference equation

current x resistance

what is potential difference measured in

volts

what is resistance measured in

ohms

what does ohmic conductors have

constant resistance

how does current flow through ohmic conductors

directly proportional to potential difference across it

what is a ohmic conductor

resistance stays constant, does not change if current increases

what is a diode

device that only allows current to flow in one direction

ldr

light dependent resistor

how does a ldr work

light intensity increase resistance decreases

what are ldrs used for

automatic night lights, outdoor lighting, burglar detectors

what does the resistance of a thermistor depend on

temperature

How does a thermistor work

temperature increases resistance decreases

what are thermistors used for

car engine temp sensors, electronic thermostats

How can ldrs and thermistors be used in sensing circuits

turn on or increase power to componenets depending on conditions they are in