U3 phys Electrical circuits and transfer of energy

what is current

rate of flow of charge

what ais potential difference

amount of energy transferred for each unit of charge that passes between points

why is energy important

its needed for something to work or change and its ability to do work

what is energy measured in

measured in joules and or KJ or 1MJ

what is meant by power

amount of energy needed transferred every second

what is resistance

how difficult it is for a electrical component to pass through the component

what is resistance measured by

ohms

what is a thermistor

a resistor whose resistance is dependent on temperature.

what are thermistors used for

used for temperature sensors

what is a diode

current that can pass through 1 direction current will not flow in opposite direction

what is LED

emits light when current passes through it

what is a photodiode

produces current when higher frequency electromagnetic radiation is indecent on it

specific heat capacity EQUATION

thermal energy= mass X specific heat capacity X temp change

specific latent heat EQUATION

thermal energy= mass X specific latent heat

what is the specific heat of fusion

substance changing state from solid to liquid to liquid to solid

what is a specific heat capacity of vaporisation

when a substance changing from liquid to gas or from gas to liquid