circuits Flashcards
(18 cards)
what is voltage
energy per unit charge
what is current
rate of flow of charge
what does a cell do
pushes current from positivity to negative which is changing chemical energy into electrical energy
how are ameters connected in a circuit
in series
how are voltmeters connected in circuits
in parallel
what happens to current into a series circuit
equal everywhere
what happens to current in parallel circuit
current is shared between different branches
what happens to voltage in series circuit
shared between components
in parallel circuits what happens to voltage
same everywhere
what is resistance measured in
Ohms
what is symbol for LDR
resistor with circle around it and arrows pointing at circle
what is symbol for thermistor
resister with hockey stick going through it
what is variable resister controlled by
YOU
what is symbol for variable resister
resister with arrow going through it
in parallel circuits what you can you do to each light
turn off each light individually
what happens when an LDR is places in a dark room
more resistance
decreased current
is resistance lower in series of parallel
resistance in parallel is lower
more paths for current to flow
so higher current
so lower resistance
what does a diode do
only allows the current to flow in one direction
