AQA A level Physics Paper 1
SOLUTIONS 100% CORRECT GRADE A+
Current
Rate of flow of charge
Coulomb
The amount of charge passing a point when a current of 1A flows for
1s
Potential difference
The work done per unit charge in moving a small point positive charge
between two points
Threshold Voltage for a Diode
The voltage at which a current will begin to flow at, assumed to be
+0.6V if not stated
Reverse Bias
When very little currency can flow in the reverse direction of a
diode
Variable Resistor
Can be used to change the current through a circuit can also be
called a rheostat
NTC Thermistor
(A type of semiconductor) that has decreasing resistance when its
temperature increases - negative temperature coefficient
Transitional Temperature
The critical temperature at and below which a superconductor has zero
resistivity
Semiconductor
A group of materials which conduct electricity (not as well as
metals), when their temperature rises they can release more charge
carriers and their resistance decreases
Resistance
The ratio of a components potential difference to its current
Volt
The potential difference across a component when 1 joule of energy is
used to move a coulomb of charge through a component
Ohm's Law
Provided that the physical conditions remain the same, the current
through an ohmic conductor is directly proportional to the potential
difference across it
Ohmic conductor
, A material that follows Ohm's law when physical components remain the
same
Diodes
Components made from semi conductors that only allow current to flow
in one direction
Resistivity
The resistance of a 1m length of wire with a 1m^2 cross sectional
area
Superconductor
A material that has zero resistivity when it is cooled below its
critical temperature
Critical Temperature
The temperature below which a material will have zero resistance and
will become a superconductor
Power
The rate of transfer of energy
EMF
The work done in moving a unit charge through a battery
Lost Volts
Work done per unit charge in overcoming the internal resistance
within a battery
Terminal PD
The potential difference between the two terminals of the power
supply
Potential Divider
A circuit with a constant voltage source and more than one resistor
connected in series that can be used to vary the output voltage
Threshold Frequency
The minimum frequency that must be incident on the surface of a metal
for the emission of photoelectrons to occur
Electromagnetic Force
A fundamental force that causes interactions between charged
particules. Virtual photons are the exchange particles
Gravitational Force
A fundamental force which causes attraction between objects with a
force proportional to their mass
Strong Nuclear Force
A fundamental force with a short range which is attractive between
0.5-3 fm and repulsive between 0-0.5fm
Alpha Decay
Occurs in nuclei of 82 protons or more that consists of an alpha
particle being emitted
Photons
Virtual particles that are discrete packets of energy
SOLUTIONS 100% CORRECT GRADE A+
Current
Rate of flow of charge
Coulomb
The amount of charge passing a point when a current of 1A flows for
1s
Potential difference
The work done per unit charge in moving a small point positive charge
between two points
Threshold Voltage for a Diode
The voltage at which a current will begin to flow at, assumed to be
+0.6V if not stated
Reverse Bias
When very little currency can flow in the reverse direction of a
diode
Variable Resistor
Can be used to change the current through a circuit can also be
called a rheostat
NTC Thermistor
(A type of semiconductor) that has decreasing resistance when its
temperature increases - negative temperature coefficient
Transitional Temperature
The critical temperature at and below which a superconductor has zero
resistivity
Semiconductor
A group of materials which conduct electricity (not as well as
metals), when their temperature rises they can release more charge
carriers and their resistance decreases
Resistance
The ratio of a components potential difference to its current
Volt
The potential difference across a component when 1 joule of energy is
used to move a coulomb of charge through a component
Ohm's Law
Provided that the physical conditions remain the same, the current
through an ohmic conductor is directly proportional to the potential
difference across it
Ohmic conductor
, A material that follows Ohm's law when physical components remain the
same
Diodes
Components made from semi conductors that only allow current to flow
in one direction
Resistivity
The resistance of a 1m length of wire with a 1m^2 cross sectional
area
Superconductor
A material that has zero resistivity when it is cooled below its
critical temperature
Critical Temperature
The temperature below which a material will have zero resistance and
will become a superconductor
Power
The rate of transfer of energy
EMF
The work done in moving a unit charge through a battery
Lost Volts
Work done per unit charge in overcoming the internal resistance
within a battery
Terminal PD
The potential difference between the two terminals of the power
supply
Potential Divider
A circuit with a constant voltage source and more than one resistor
connected in series that can be used to vary the output voltage
Threshold Frequency
The minimum frequency that must be incident on the surface of a metal
for the emission of photoelectrons to occur
Electromagnetic Force
A fundamental force that causes interactions between charged
particules. Virtual photons are the exchange particles
Gravitational Force
A fundamental force which causes attraction between objects with a
force proportional to their mass
Strong Nuclear Force
A fundamental force with a short range which is attractive between
0.5-3 fm and repulsive between 0-0.5fm
Alpha Decay
Occurs in nuclei of 82 protons or more that consists of an alpha
particle being emitted
Photons
Virtual particles that are discrete packets of energy
