Topics:
-Charge
-Current
-Voltage and e.m.f.
-Resistance
-Resistivity
-Voltage/Current graphs
-Circuit components
-Series and parallel circuits
Includes diagrams and equations.
, 03
01 02
Electric current Given by the Current is
is defined as equation: ΔQ = measured in
the rate of flow IΔt Amperes (A)
of charge. and Current is
measured in
Coulombs (C)
Electric Current:
, Electron flow
Conventional current flows from positive to
negative.
This differs from electron flow, which is from
negative to positive.
Electrons take a chaotic path and don’t usually
travel in a straight line.
If no p.d. is applied, then electrons will still
move, but there will be no net movement.
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