# Physical Quantities, Symbols and Units

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1 Table 1 below indicates the physical quantities required for numerical calculations that are included in the Access 3 Physics units and the Intermediate 1 Physics units and course together with the SI unit of the quantity. Table 1 Physical Quantity Unit distance metre time second speed, average speed metre per second mass kilogram weight newton current ampere voltage volt resistance ohm power watt input voltage volt output voltage volt voltage gain - February 2004 page 1 of 10

2 Table 2 below indicates the physical quantities required for numerical calculations that are included in the Standard Grade Physics course together with: the symbol used by SQA the SI unit of the quantity (and alternative units included in the course) the abbreviation for the unit used in Credit level examinations. In General level examinations full words are used for the units of all physical quantities. Table 2 distance d or s metre light year height h metre m wavelength λ metre m amplitude Α metre m time t second s speed, final speed v metre per second m/s initial speed u metre per second m/s change of speed v metre per second m/s average speed v metre per second frequency f hertz Hz acceleration a metre per second per second m/s 2 acceleration due to gravity g metre per second per second m/s 2 gravitational field strength g newton per kilogram N/kg mass m kilogram kg weight W newton N force, thrust F newton N energy E joule kilowatt-hour kinetic energy E k joule J potential energy E p joule J heat energy E h joule J input energy E i joule J output energy E o joule J work done W or E W joule J m m/s J kw h power P watt W February 2004 page 2 of 10

3 Table 2 (cont) output power P o watt W input power P i watt W focal length of a lens f metre m power of a lens P dioptre D electric charge Q coulomb C electric current I ampere A voltage V volt V resistance R ohm Ω input voltage V i volt V output voltage V o volt V voltage gain A o or V gain - - power gain P gain - - primary voltage V p volt V secondary voltage V s volt V primary current I p ampere A secondary current I s ampere A number of turns on primary coil number of turns on secondary coil n p - - n s - - efficiency (η) - - temperature T degree Celsius C specific heat capacity c joule per kilogram per degree Celsius J/kg C specific latent heat l joule per kilogram J/kg activity A becquerel Bq count rate - counts per second (counts per minute) equivalent dose H sievert Sv half-life t ½ second (minute, hour, day, year) - s February 2004 page 3 of 10

4 Table 3 below indicates the physical quantities required for numerical calculations that are included in the Intermediate 2 Physics course together with: the symbol used by SQA the SI unit of the quantity (and alternative units included in the course) the abbreviation for the unit used in Intermediate 2 examinations. Table 3 distance s or d metre m displacement s metre m speed, velocity v metre per second m/s time t second s change of velocity v metre per second m/s average velocity v metre per second initial velocity u metre per second m/s final velocity v metre per second m/s acceleration a metre per second per second m/s 2 mass m kilogram kg weight W newton N force F newton N acceleration due to gravity g metre per second per second m/s 2 gravitational field strength g newton per kilogram N/kg momentum p kilogram metre per second kg m/s energy E joule J work done W or E W joule J potential energy E p joule J height h metre m kinetic energy E k joule J power P watt W efficiency (η) - - temperature T degree Celsius C specific heat capacity c joule per kilogram per degree Celcius m/s J/kg C specific latent heat l joule per kilogram J/kg heat energy E h joule J February 2004 page 4 of 10

5 Table 3 (cont) electric charge Q coulomb C electric current I ampere A voltage, potential difference V volt V supply voltage V s volt V resistance R ohm Ω total resistance R T ohm Ω number of turns on primary coil number of turns on secondary coil n p - - n s - - primary voltage V p volt V secondary voltage V s volt V primary current I p ampere A secondary current I s ampere A input voltage V i volt V output voltage V o volt V voltage gain A o or V gain - - wavelength λ metre m frequency f hertz Hz period T second s amplitude A metre m angle θ degree critical angle θ c degree power (of a lens) P dioptre D focal length f metre m activity A becquerel Bq count rate - counts per second (counts per minute) absorbed dose D gray Gy radiation weighting factor w R - - equivalent dose H sievert Sv half-life t ½ second (minute, hour, day, year) - s February 2004 page 5 of 10

6 Table 4 below indicates the physical quantities required for numerical calculations that are included in the Higher Physics course together with: the symbol used by SQA the SI unit of the quantity (and alternative units included in the course) the abbreviation for the unit used in Higher examinations. Table 4 distance s or d metre m displacement s metre m speed, velocity v metre per second m s -1 time t second s change of velocity v metre per second m s -1 average velocity v metre per second m s -1 final velocity v metre per second m s -1 initial velocity u metre per second m s -1 acceleration a metre per second per second m s -2 mass m kilogram kg weight W newton N acceleration due to gravity g metre per second per second m s -2 gravitational field strength g newton per kilogram N kg -1 force, tension, upthrust F newton N momentum p kilogram metre per second kg m s -1 impulse ( p) newton second kilogram metre per second N s kg m s -1 energy E joule J work done W or E W joule J potential energy E p joule J height, depth h metre m kinetic energy E k joule J power P watt W volume V cubic metre m 3 density ρ kilogram per cubic metre kg m -3 area A square metre m 2 pressure P or p pascal Pa kelvin K temperature T degree Celsius C February 2004 page 6 of 10

7 Table 4 (cont) electric charge Q coulomb C electric current I ampere A voltage, potential difference V volt V electromotive force (e.m.f) E or ε volt V internal resistance r ohm Ω resistance R ohm Ω peak voltage V peak volt V root mean square voltage V rms volt V peak current I peak ampere A root mean square current I rms ampere A capacitance C farad F input voltage V 1 or V 2 volt V output voltage V o volt V feedback resistance R f ohm Ω voltage gain A o or V gain - - period T second s frequency f hertz Hz wavelength λ metre m angle θ degree critical angle θ c degree refractive index n - - irradiance I watt per square metre W m -2 Planck s constant h joule second J s number of photons per second N - - threshold frequency f o hertz Hz energy level W 1, W 2, joule J speed of light in a vacuum c metre per second m s -1 activity A becquerel Bq count rate - counts per second (counts per minute) number of nuclei decaying in time t N - - absorbed dose D gray Gy - February 2004 page 7 of 10

8 Table 4 (cont) absorbed dose rate D & gray per second Gy s -1 gray per hour Gy h -1 gray per year Gy y -1 radiation weighting factor w R - - equivalent dose H sievert Sv equivalent dose rate H & sievert per second sievert per hour sievert per year effective dose H sievert Sv half-life t ½ second (minute, hour, day, year) Sv s -1 Sv h -1 Sv y -1 half-value thickness T ½ metre m s February 2004 page 8 of 10

10 Table 5 (cont) wavelength λ metre m momentum p kilogram metre per second kg m s -1 electric charge Q or q coulomb C electric field strength E newton per coulomb N C -1 electrical potential V volt V potential difference V volt V electric current I ampere A magnetic induction B tesla T angle θ degree radian induced e.m.f. E or ε volt V self-inductance L henry H frequency f hertz Hz period T second s velocity of source v s metre per second m s -1 velocity of observer v o metre per second m s -1 frequency of source f s hertz Hz phase angle Φ radian rad refractive index n - - fringe separation x metre m slit separation d metre m grating to screen distance D metre m rad polarising angle (Brewster s angle) i p degree February 2004 page 10 of 10

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