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A level Physics
Module 4: Electrons waves and Photons
4.1 Charge and Current
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4.1.2 Mean Drift Velocity
A level Physics > Module 4: Electrons waves and Photons > 4.1 Charge and Current
7 cards
Cards (14)
Electric current is the
rate
of
flow
of
charge
I =
Q
/t
One coulomb is the amount of
charge
passing a point in
1s
when the current is
1A
The magnitude of
charge
on an object is expressed as:
Q= + or -
n
* e
Kirchhoff's
first
law states that the
sum
of
currents
entering a
junction
is
equal
to the sum of
currents
leaving the
junction
This is a statement of the
conservation
of
charge
We refer to charges of ions(+1, -1) as
quantised
numbers, and are represented as
integer
multiples of the
elementary
charge e =
1.60
*
10
^
-19
Current
is:
The
movement
of
electrons
in conductors
The
movement
of
ions
in Electrolytes
Direction of
conventional
current is
positive
terminal to the
negative
terminal
Electron
flow is from the
negative
terminal to the
positive
terminal
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