electric current
flow of electrons
from negative to the positive
flow through a complete circuit
current
short circuit
chemical reactions inside the cell pushes the electron
measured in A
definition: the rate of the flow of electrical charge
ammeter
voltage
potential difference
from negative to positive
series circuit
the amount of current is the same in any componets
one path for electrons to flow
collect energy from the cell and lights up a bulb
current is not used up
parallels circuit
total amps in the branches= total amp before spliting into the branches
branches dont have to be the same current
cell transfer chemical energy to electrical energy
voltmeter
place voltmeter across a component
total energy carried by the current is shared between the components
potential difference of each branch is the same as the potential difference of the cell
the difference in charge between 2 points
resistance
formula
a single component will receive all of the energy from current
measure the voltage across that compoent
Ohm
r=v/i
a material' s tendency to resist the flow of current
current will be bigger when resistance is smaller
temperature affects the flow of electrons
vibrates more when hot