Flashcards in electricity Deck (11):
the measure of the flow of electrons, measured in amps (A)
measured in volts (V)
how difficult it is for electrons to move through a component or wire, measured in ohms (Ω)
the rate at which electrical energy is supplied to a circuit, measured in watts (W) or joules per second(j/s)
measured in coulombs (C)
what is a non ohmic conductor?
a non ohmic conductor is a component which does not follow ohms law so it's graph is non linear.
how is a filament bulb an non ohmic conductor?
a filament bulb consists of a thin metal wire and so when the temperature increases the resistivity increases. This also happens in the opposite direction.
features of a diode:
-diodes let through a small current until the threshold voltage is reached then it allows a lot of current to pass.
-diodes can change a A.C to a D.C
- can be used to protect sensitive circuits
-only allows current to travel one way
what is the link between resistivity and conductivity?
a material with low resistivity means it will allow current to flow easier, so metals with a low resistivity are good conductors.
how would you expect the resistance of a diode to vary as pd increases?
as pd increases then resistance will decrease, it will start high and then become lower.