AQA A level Physics Paper 1
CurrentANSWERRate of flow of charge
CoulombANSWERThe amount of charge passing a point when a current of 1A flows for 1s
Potential differenceANSWERThe work done per unit charge in moving a small point positive charge between two points
Threshold Voltage for a DiodeANSWERThe voltage at which a current will begin to flow at, assumed to be
+0.6V if not stated
Reverse BiasANSWERWhen very little currency can flow in the reverse direction of a diode
Variable ResistorANSWERCan be used to change the current through a circuit can also be called a rheostat
NTC ThermistorANSWER(A type of semiconductor) that has decreasing resistance when its temperature increases - negative temperature coefficient
Transitional TemperatureANSWERThe critical temperature at and below which a superconductor has zero resistivity
SemiconductorANSWERA 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
ResistanceANSWERThe ratio of a components potential difference to its current VoltANSWERThe potential difference across a component when 1 joule of energy is used to move a coulomb of charge through a component
Ohm's LawANSWERProvided that the physical conditions remain the same, the current through an ohmic
conductor is directly proportional to the potential difference across it
Ohmic conductorANSWERA material that follows Ohm's law when physical components remain the same
DiodesANSWERComponents made from semi conductors that only allow current to flow in one direction
ResistivityANSWERThe resistance of a 1m length of wire with a 1m^2 cross sectional area
SuperconductorANSWERA material that has zero resistivity when it is cooled below its critical temperature
Critical TemperatureANSWERThe temperature below which a material will have zero resistance and will become a superconductor
PowerANSWERThe rate of transfer of energy
EMFANSWERThe work done in moving a unit charge through a battery
Lost VoltsANSWERWork done per unit charge in overcoming the internal resistance within a battery
Terminal PDANSWERThe potential difference between the two terminals of the power supply
Potential DividerANSWERA circuit with a constant voltage source and more than one resistor connected in series that can be used to vary the output voltage
Threshold FrequencyANSWERThe minimum frequency that must be incident on the surface of a metal for the emission of photoelectrons to occur
CurrentANSWERRate of flow of charge
CoulombANSWERThe amount of charge passing a point when a current of 1A flows for 1s
Potential differenceANSWERThe work done per unit charge in moving a small point positive charge between two points
Threshold Voltage for a DiodeANSWERThe voltage at which a current will begin to flow at, assumed to be
+0.6V if not stated
Reverse BiasANSWERWhen very little currency can flow in the reverse direction of a diode
Variable ResistorANSWERCan be used to change the current through a circuit can also be called a rheostat
NTC ThermistorANSWER(A type of semiconductor) that has decreasing resistance when its temperature increases - negative temperature coefficient
Transitional TemperatureANSWERThe critical temperature at and below which a superconductor has zero resistivity
SemiconductorANSWERA 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
ResistanceANSWERThe ratio of a components potential difference to its current VoltANSWERThe potential difference across a component when 1 joule of energy is used to move a coulomb of charge through a component
Ohm's LawANSWERProvided that the physical conditions remain the same, the current through an ohmic
conductor is directly proportional to the potential difference across it
Ohmic conductorANSWERA material that follows Ohm's law when physical components remain the same
DiodesANSWERComponents made from semi conductors that only allow current to flow in one direction
ResistivityANSWERThe resistance of a 1m length of wire with a 1m^2 cross sectional area
SuperconductorANSWERA material that has zero resistivity when it is cooled below its critical temperature
Critical TemperatureANSWERThe temperature below which a material will have zero resistance and will become a superconductor
PowerANSWERThe rate of transfer of energy
EMFANSWERThe work done in moving a unit charge through a battery
Lost VoltsANSWERWork done per unit charge in overcoming the internal resistance within a battery
Terminal PDANSWERThe potential difference between the two terminals of the power supply
Potential DividerANSWERA circuit with a constant voltage source and more than one resistor connected in series that can be used to vary the output voltage
Threshold FrequencyANSWERThe minimum frequency that must be incident on the surface of a metal for the emission of photoelectrons to occur
