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Science 1
Physics 1
Electricity
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Created by
Sienna Carding
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Cards (11)
How does the resistance of a thermistor change with temperature
As temperature
increases
the resistance
decreases
How does the resistance of an LDR change with light?
As light intensity
increases
, LDR resistance
decreases
What can we assume for a series circuit?
The
current
is the
same
all the way around,
voltage
is
shared
between components
What can we assume for a parallel circuit?
The
current
is
shared
between
branches
,
voltage
is the
same
on each
branch
How must an ammeter be connected?
In
series
How must a voltmeter be connected?
In
parallel
Define national grid
System of
cables
and
transformers
linking
power
stations to
consumers
State the properties of the UK mains ac supply
230
volts,
50
hertz
Name the 2 types of transformers and what they do
Step up-
increases
voltage,
decreased
current
Step down-
decreases
voltage,
increases
current
State the colours and functions of the 3 wires in a 3 core cable
Blue=
neutral
, brown=
live
, yellow/green=
earth
How does an earth wire prevent electrocution?
Allows a
large current
to flow to earth, then the
fuse
blows
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