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GCSE PHYSICS
paper 1
electricty
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Created by
Charlotte
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Cards (62)
What must be true for electrical charge to flow?
The
circuit
must be
closed
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What is required for charge to flow in a circuit?
There must be a source of
potential difference
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What does electrical current represent?
Flow of
electrical charge
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How does the rate of flow of charge relate to current?
Greater
flow rate means
greater
current
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What is the formula relating charge, current, and time?
Q
=
Q =
Q
=
I
⋅
t
I \cdot t
I
⋅
t
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What is true about current in a single closed loop?
The current has the same
value
at any point
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What factors affect the current through a component?
Resistance
and
potential difference
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How does resistance affect current for a given potential difference?
Greater
resistance results in
smaller
current
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What is the formula for potential difference, current, and resistance?
V
=
V =
V
=
I
⋅
R
I \cdot R
I
⋅
R
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What characterizes an ohmic conductor?
Resistance
is constant, current is
proportional
to potential difference
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What happens to the resistance of a filament lamp as temperature increases?
The
resistance
increases
with
temperature
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How does a diode behave in terms of current flow?
Current flows in one
direction
only
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What happens to resistance as current increases in a resistor?
Resistance
increases
, current
decreases
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How does temperature affect the resistance of a thermistor?
Resistance is lower at
higher
temperatures
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How does the length of a wire affect its resistance?
Greater
length
results in
more
resistance
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What is the behavior of an LDR in light conditions?
Resistance decreases with greater
light intensity
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What happens to a diode's resistance in the reverse direction?
It has a very high
resistance
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What characterizes a series circuit?
Current
follows a single path
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What is true about current in a series circuit?
The
current
is
the
same
everywhere
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How is total resistance calculated in a series circuit?
Total resistance is the sum of
resistances
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What characterizes a parallel circuit?
Current
splits into multiple paths
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What is true about potential difference in a parallel circuit?
The
potential difference
is the
same
across each
branch
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How is total current calculated at a junction in a parallel circuit?
Total current is the sum of currents in
branches
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What happens to total resistance when resistors are in parallel?
Total resistance is less than the
smallest
resistor
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How do electric fields behave around charges?
They point away from
positive
charges, towards
negative
charges
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What happens to the strength of an electric field with distance from the charge?
Closer to the charge, the stronger the
force
felt
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What type of electricity supply is mains electricity?
AC supply
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What is the frequency of domestic electricity supply in the UK?
50
Hz
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What is the voltage of the domestic electricity supply in the UK?
About
230 V
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How does AC current behave?
It continuously varies from
positive
to
negative
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What is the difference between AC and DC?
AC changes
direction
, DC flows one way
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What color is the live wire in a plug?
Brown
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What is the voltage of the live wire?
230 V
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What is the purpose of the neutral wire?
Completes the
circuit
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What is the function of the earth wire?
Prevents appliances from becoming
live
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What happens if the live wire touches the metal casing?
The casing becomes live, causing
electric shock
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What is power in terms of energy transfer?
Energy transferred
per second
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How is power related to current and voltage?
Power
is
directly
proportional
to
current
and
voltage
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What is the formula for energy transferred in terms of power?
E
=
E =
E
=
P
⋅
t
P \cdot t
P
⋅
t
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What is the formula for energy transferred in terms of charge?
E
=
E =
E
=
Q
⋅
V
Q \cdot V
Q
⋅
V
View source
See all 62 cards
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