Electricity Flashcards
what do electric charges create
electric fields
what does the force in an electric field cause
attraction or repulsion
how does distance affect force
as the distance between charged objects is increased, the force between them gets smaller
how is an electric field shown
with field lines
like charges
repel
opposite charges
attract
how do electrons flow in a circuit
from the negative terminal to the positive terminal
the unit of current is
the ampere
to find the charge in a circuit we use the equation
Q=It charge=current x time
what is potential difference
the driving force that pushes the charge round the circuit
one volt is…
one joule per coulomb
how does resistance affect flow in a circuit
it slows it down
how does temperature affect resistance
the resistance increases with the temperature (except thermistors)
what is ohms law
a law stating that current is proportional to voltage
what type of graphs do ohmic components have
straight IV graphs
