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AQA A level Physics Paper 1 Questions & Answers
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AQA A level Physics Paper 1 Questions & Answers
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AQA A level Physics Paper 1 Questions& Answers
Current - ANSWER-Rate of flow of charge
Coulomb - ANSWER-The amount of charge passing a point when a current of 1A flows for 1s
Potential difference - ANSWER-The work done per unit charge in moving a small point positive charge
between two points
Threshold Voltage for a Diode - ANSWER-The voltage at which a current will begin to flow at, assumed to
be +0.6V if not stated
Reverse Bias - ANSWER-When very little currency can flow in the reverse direction of a diode
Variable Resistor - ANSWER-Can be used to change the current through a circuit can also be called a
rheostat
NTC Thermistor - ANSWER-(A type of semiconductor) that has decreasing resistance when its
temperature increases - negative temperature coefficient
Transitional Temperature - ANSWER-The critical temperature at and below which a superconductor has
zero resistivity
Semiconductor - ANSWER-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 - ANSWER-The ratio of a components potential difference to its current
, Volt - ANSWER-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 - ANSWER-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 - ANSWER-A material that follows Ohm's law when physical components remain the
same
Diodes - ANSWER-Components made from semi conductors that only allow current to flow in one
direction
Resistivity - ANSWER-The resistance of a 1m length of wire with a 1m^2 cross sectional area
Superconductor - ANSWER-A material that has zero resistivity when it is cooled below its critical
temperature
Critical Temperature - ANSWER-The temperature below which a material will have zero resistance and
will become a superconductor
Power - ANSWER-The rate of transfer of energy
EMF - ANSWER-The work done in moving a unit charge through a battery
Lost Volts - ANSWER-Work done per unit charge in overcoming the internal resistance within a battery
Terminal PD - ANSWER-The potential difference between the two terminals of the power supply
Potential Divider - ANSWER-A circuit with a constant voltage source and more than one resistor
connected in series that can be used to vary the output voltage
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