OCR A physics specification

This is the specification for OCR A physics - just the things you need to know.

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  • Created on: 13-11-12 18:36
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OCR physics A specification
Charge and current
explain that electric current is a net flow of charged particles
explain that electric current in a metal is due to the movement of electrons, whereas
in an electrolyte the current is due to the movement of ions
explain what is meant by conventional current and electron flow
select and use the equation Q = It
define the coulomb
describe how an ammeter may be used to measure the current in a circuit
recall and use the elementary charge e = 1.6 x 10¯¹C
describe Kirchhoff's first law and appreciate that this is a consequence of
conservation of charge
state what is meant by the term mean drift velocity of charge carriers
select and use the equation I = Anev
describe the difference between conductors, semiconductors and insulators in terms
of the number density n
E.m.f. and p.d.
define potential difference (p.d.)
select and use the equation W = VQ
define the volt
describe how a voltmeter may be used to determine the p.d. across a component
define electromotive force (e.m.f.) of a source such as a cell or a power supply
describe the difference between e.m.f. and p.d. in terms of energy transfer
Resistance
define resistance
select and use the equation for resistance R = V/I
define the ohm
state and use Ohm's law
describe the I­V characteristics of a resistor at constant temperature, filament lamp
and light-emitting diode (LED)
describe an experiment to obtain the I­V characteristics of a resistor at constant
temperature, filament lamp and light-emitting diode (LED)
describe the uses and benefits of using light-emitting diodes (LEDs)
Resistivity
define resistivity of a material
select and use the equation R = L/A

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NTC) thermistor is affected by temperature
Power
describe power as the rate of energy transfer
select and use power equations P = VI, P = I²R, P = V²/R
explain how a fuse works as a safety device
determine the correct fuse for an electrical device
select and use the equation W = IVt
define the kilowatt-hour (kW h) as a unit of energy
calculate energy in kW h and the cost of this energy when solving problems
Series and parallel circuits
state Kirchhoff's second…read more

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Electromagnetic waves
state typical values for the wavelengths of the different regions of the
electromagnetic spectrum from radio waves to -rays
state that all electromagnetic waves travel at the same speed in a vacuum
describe differences and similarities between different regions of the
electromagnetic spectrum
describe some of the practical uses of electromagnetic waves
describe the characteristics and dangers of UV-A, UV-B and UV-C radiations and
explain the role of sunscreen
explain what is meant by plane polarised waves and understand the polarisation of
electromagnetic…read more

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Stationary waves
explain the formation of stationary (standing) waves using graphical methods
describe the similarities and differences between progressive and stationary waves
define the terms nodes and antinodes
describe experiments to demonstrate stationary waves using microwaves, stretched
strings and air columns
determine the standing wave patterns for stretched string and air columns in closed
and open pipes
use the equation: separation between adjacent nodes (or antinodes) = /2
define and use the terms fundamental mode of vibration and harmonics
determine the speed of sound in…read more

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Broglie equation = h/mv
explain that the diffraction of electrons by matter can be used to determine the
arrangement of atoms and the size of nuclei
Energy levels in atoms
explain how spectral lines are evidence for the existence of discrete energy levels in
isolated atoms, i.e.…read more

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Linear motion
derive the equations of motion for constant acceleration in a straight line from a
velocity against time graph
select and use the equations of motion for constant acceleration in a straight line:
v = u +at, s = ½(u + v)t, s = ut + ½at² and v² = u² + 2as
apply the equations for constant acceleration in a straight line, including the motion
of bodies falling in the Earth's uniform gravitational field without air resistance
explain how experiments carried out by…read more

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V
select and use the equation for pressure p = F/A where F is the force normal to the
area A
Car safety
define thinking distance, braking distance and stopping distance
analyse and solve problems using the terms thinking distance, braking distance and
stopping distance
describe the factors that affect thinking distance and braking distance
describe and explain how air bags, seat belts and crumple zones in cars reduce impact
forces in accidents
describe how air bags work, including the triggering mechanism
describe how the…read more

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Power
define power as the rate of work done
define the watt
calculate power when solving problems
state that the efficiency of a device is always less than 100% because of heat losses
select and apply the relationship for efficiency: efficiency = useful output energy/
total input energy x 100%
interpret and construct Sankey diagrams
Behaviour of springs and materials
describe how deformation is caused by a force in one dimension and can be tensile
or compressive
describe the behaviour of springs and wires in…read more

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