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igcse physics notesprinted 97 · PDF 97
124 pagesrevision 46936
printed 97 · PDF 97
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Electric fields:
Electric fields are regions of space around which an electric charge
experiences a force
The direction of an electric field at a point is the direction of the force on a
positive charge at that point.
Drawing electric fields:
Electric field lines point away from positive charges and towards negative
charges.
The field lines around a charged conducting sphere are as if the charge
was concentrated at the center of the sphere.
The field lines between two charged plates go in straight lines from the
positive plate to the negative plate and are equally spaced apart.
Current:
Current I is measured in amps and is the rate of flow of charge at a point in
the circuit.
● The current is given by I=Q/t.
● It is measured with an ammeter placed in series.
● In metals, current is due to a flow of electrons.
Conventional current is the rate of flow of positive charge from positive
terminal to negative terminal.
Electrons Flow is the flow of negative charge(electrons) from negative
terminal to positive terminal.