Resistance of a Filament Lamp Flashcards
we find filament lamps where?
why are filament lamps being phased out?
in homes
they’re not as energy efficient as a torch
what does the word filament mean
a very very fine wire
where can we find the filament of a lamp
inside the bulb
what does the close up of a filiment lamp wire look like
the wire is very tightly coiled in
why might a filiment lamp wire get extremely hot?
when an electric current passes through it
what happens when an electric current passes through the filament
it gets extremely hot and causes it to glow and give out light
In a circuit, there is a filament lamp.
(just like we did with the resistor)
we change the potential difference (V) and measure the current (A)
explain the proportion of the current(A) and the potential difference(V)
explain why.
the current through a filament lamp is not directly proportional to the potential difference
because the filament gets hot, which causes the resistance to increase
at high temperatures, what are the atoms in the filament like?
at High temperatures the atoms in the filament vibrate more
when the atoms in the filament vibrate, what happens to the electrons in the current?
what is required for this to happen
the electrons in the current now collide more with the atoms
more energy is needed to push the current through the filament
what can we see on the graph
where the circuit involves a filament lamp and
we decide to change the potential difference and measure the current
how is the shape of the graph?
as the potential difference increases, the current no longer increases as much
use google / check camera roll labels: bottom corner left corner and top right corner = bulb getting hot X axis on right = p.d (V) Y axis on top = current (A)
looks something like a backwards S but less curvy and goes from bottom left to top right
