Units & Prefixes Flashcards

All 6 cards in this deck

What are the SI base units, and their symbols, for length, mass, time, electric current, temperature and amount of substance?

metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol).

Which SI units (and symbols) are used for force, energy, power and pressure?

newton (N), joule (J), watt (W), pascal (Pa).

Which SI units (and symbols) are used for frequency, charge, potential difference, resistance and magnetic flux density?

hertz (Hz), coulomb (C), volt (V), ohm ($\Omega$), tesla (T).

Which unit, other than $\mathrm{m/s^2}$, can be used for gravitational field strength (the acceleration due to gravity $g$)?

$\mathrm{N/kg}$ — $\mathrm{N/kg}$ and $\mathrm{m/s^2}$ are equivalent units.

What do the prefixes giga, mega, kilo, centi, milli, micro and nano mean as powers of ten?

giga (G) $10^{9}$, mega (M) $10^{6}$, kilo (k) $10^{3}$, centi (c) $10^{-2}$, milli (m) $10^{-3}$, micro ($\mu$) $10^{-6}$, nano (n) $10^{-9}$.

True or false? A current of 200 mA is larger than a current of 0.5 A.

False. 200 mA $=$ 0.2 A, which is smaller than 0.5 A.