Electricity Flashcards
current
The rate of flow of charge in a circuit
resistance
: A measure of how difficult it is for current to flow through a material.
resistivity
A quantity that is proportional to an object’s resistance and
cross-sectional area, and inversely proportional to the object’s length
potential difference
work done per unit charge.
formula for pd
resistance x current And work done/charge
formula for power
pd x current
resistors in series
= 𝑅1 + 𝑅2 + 𝑅3 +
resistors in parallel
1/r total = 1/r1 + 1/r2 + 1/r3 + ….
CURRENT formuals
current = pd/resistance and current =change of charge/change of time
ohms law
The current and potential difference through an ohmic conductor
held under constant physical conditions are directly proportional, with the constant
of proportionality being resistance.
Resistivity formula
density x length / cross sectional area
superconductor
if you cool down some materials below a critical temp they will have no resistivity and be a superconductor
