random booklet stuff Flashcards
current definition
the rate of flow of charge
if component x and y are in series how does current flow
it must pass through x before passing through y
if component x and y are in parallel how does current flow
current passes through x and y at the same time
how do we measure potential difference
voltmeter
what provides pd in a circuit
the battery
what makes a battery
two or more cells in series
what is resistance a measure of
how difficult it is for current to flow through the component
the higher resistance the —— it is for pd to push charges
higher resistance = harder for pd to push charges
what does ohmics law state
current is directly proportional to pd
what effect does thermistor have on resistance
higher temp lower resistance
ldr effect on resistance
higher light intensity is lower resistance
thermistor effect on current
higher temp higher current
ldr effect on current
higher light intensity higher current
what will current be like in series and why
same at all points
bc same amount of charge will pass through every point every second
potential difference in series circuit
total pd in battery = sum of pd of other components
how does current flow in parallel
split between branches of circuit
current rule in parallel
current in battery = sum of current in branches
what is pd a measure of
how much energy each coulomb of charge receives from battery
how much energy each coulomb loses when it passes through something
