1.1 Physical quantities, base and derived units Flashcards
What are SI Units?
The base units for the 7 base quantities
What is the base unit and symbol for length?
Metre (M)
What is the base unit and symbol for mass?
Kilograms (Kg)
What is the base unit and symbol for time?
Second (s)
What is the base unit and symbol for current?
ampere (A)
What is the base unit and symbol for the temperature interval?
Kelvin (K)
What is the base unit and symbol for an amount of a substance?
Moles (Mol)
What are derived units?
Physical quantities that are defined in terms of 2 or more base quantities
What is the definition and base unit of speed?
distance/time
ms–1
What is the definition and base unit of acceleration?
∆velocity/∆time
ms–2
What is the definition, derived unit and base unit of force?
F = m × a
newton (N), kgms–2
What is the definition, derived unit and base unit of pressure?
p = F/A
pascal (Pa) kgm–1 s–2
What is the definition, derived unit and base unit of work (energy)?
W = F × x
joule (J) kgm2 s–2
What is the definition, derived unit and base unit of power?
P = W/t
watt (W) kgm2 s
What is the definition, derived unit and base unit of charge?
Q = I × t
coulomb (C), As
What is the definition, derived unit and base unit of PD?
V = W/Q
volt (V), kgm2 A–1 s–3
What is the definition, derived unit and base unit of resistance?
R = V/I
ohm (Ω), kgm2 A–2 s–3
What is the symbol and multiple of pico
p - 10–12
What is the symbol and multiple of nano
n 10–9
What is the symbol and multiple of micro
μ 10–6
What is the symbol and multiple of milli
m 10–3
What is the symbol and multiple of kilo
k 103
What is the symbol and multiple of mega
M 106
What is the symbol and multiple of giga
G 109
