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electricity
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Cards (16)
cell
one battery
battery
two
or more
cells
together
power supply
provides
the
electrical energy
(e.g.
cell
)
a
load
when
electrical
energy is
converted
into other
useful
forms of
energy
(e.g.
light bulb
)
conducting
paths
allows
electric charge
to
flow
around the
circuit
(the
wire
)
3 things that circuits need to have to work
An energy source
(
battery
or
mains power
), an
energy receiver
(like a light bulb) and an energy pathway (like a wire)
For a circuit to work:
For a circuit to work, it must have the
loads
connected in a
conducting path
that connects to
both sides
of the
power supply
Charge
; symbol; unit
A
physical property
whereby a
particle
can be either
positive
or
negative.
The symbol for charge is
Q.
The unit for charge is
Coulomb
(
C
).
Particle
with
no charge
A particle with no charge is
neutral
Current
; symbol; unit; measured using.
The
rate of flow of charge.
The symbol for current is
I.
The unit for current is
Amperes
(
A
). Measured using an
ammeter.
Charge (Q), current (I), time (T)
I = Q / T
T = Q / I
Q = I x T
Conventional
current
Electrons
move and cause
the current.
Current: + (
positive
) --> - (
negative
)
Electron
flow
- (
negative
) --> + (
positive
)
Potential difference
What
pushes
the
charge
to make them
flow
around the
circuit.
What is a
conductor
(give 3 examples)
A
material
that
allows
electricity to
flow through
it; 3 examples:
copper
,
aluminium
,
gold
What is a
insulator
(give 3 examples)
A
material
that
does not allow
electricity to
flow through it easily
; 3 examples:
wood
,
glass
,
rubber
,
plastic.