ch11 - practical circuits Flashcards
internal resistance
the internal reissrance of a sourcd of emf is rhe resistance inherent in the source itself
terminal p.d.
the potential difference across the terminals of a source and is dependent on the current that is taken from the source
V = E - Ir
what is a potential divider
a circuit that splits the potential difference from a source into two parts
Vout = (R2 / R1 + R2) * Vin
what is a sensor
an electronic component with a property that changes when a physical quantity such as temperature or light intensity alters
what components can act as a sensor
. LDR
. NTC thermistor
what is a transducer
an electronic component with a property that changes when a physical quantity such as temperature or light intensity alters
what is a potentiometer
a device used for comparing potential differences
galvanometer
an instrument used to measure or detect small electric currents, often not calibrated
null method
an experimental technique where a zero reading is sought
Ex = AY/AB * Eo
comparing emfs with a potentiometer
add in parallel
comparing p.d.s
connect just one or 2 resistors ina seperate circuit
