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paper one
electricity
current
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Created by
matilda bailey
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Cards (9)
current =
charge
/
time
what is current?
the
rate
of flow of
charge
, an electric current is carried by a flow of electrons
electrons carry
negative
charge
the amount of
charge
passing through a point in a
circuit
per unit time
what is the unit for current?
'ampere'
(A)
1 ampere =
1 coulomb
per
second
current
calculation
Q=I
x t
Q =
charge
/
coulombs
I =
current
/
amps
t =
time
/
seconds
direct
current
direct potential differences produce direct currents
direct currents always flow in the
same
direction (polarity)
alternating current
alternating potential differences produce
alternating
currents
alternating
currents change direction (polarity)
an
ammeter
measures
current
in
amps
ammeters
must be placed in
series
the greater the
resistance
, the smaller the
current
that flows through it for a given
potential difference
across the component