Physical Quantities (1) Flashcards
Basic Units
metre (m) - length second (s) - time kilogram (kg) - mass kelvin (K) - temperature ampere (A) - current
(make sure all numbers are in these units before using equations)
Derived Units
made by combining basic units
frequency
hertz (Hz)
/s
s^-1
force
newton (N)
kg(m/s²)
kg m/s²
pressure
pascal (Pa)
N/m²
kg/m/s²
energy/work
joules (J)
Nm
kg m²/s²
power
watt (w)
J/s
kg m² s^-3
electric charge
coulomb (C)
As
As
electric potential
volt (V)
W/A
kg m² s^-3 A^-1
electric capacitance
farad (F)
C/V
kg^-1 m^-2 s^4 A²
electric resistance
ohm ( Ω)
V/A
magnetic flux
weber (Wb)
Vs
magnetic flux density
tesla (T)
Wb/m²
inductance
henry (H)
Wb/A
temperature
degree Celsius (°C)
K - 273.15
K
plane angle
radian (rad)
activity
becquerel (Bq)
/s
s^-1
tera- (T)
10 ^ 12
giga- (G)
10 ^ 9
mega- (M)
10 ^ 6
kilo- (k)
10 ^ 3
centi- (c)
10 ^ -2
milli (m)
10 ^ -3
micro- (μ)
10 ^ -6
nano- (n)
10 ^ -9
pico- (p)
10 ^ -12
micrometer
measures diameter
accurate to 0.01mm
(tighten ratchet till it clicks, record zero error, add/subtract from final measurement)
zero error
the amount you need to add or subtract to make your starting point zero
(due to wear and tear instruments need to be zeroed}
vernier callipers
diameter
accurate to 0.2mm
vernier scales
- measure angles in spectrometer
- use secondary scale to measure line that lines up best
