Use of SI units and their prefixes

• What are the SI units for length?

  m (metres)
• What are the SI units for mass?

  kg (kilograms)
• What are the SI units for time?

  s (seconds)
• What are the SI units for amount of substance?

  mol (moles)
• What are the SI units for temperature?

  K (kelvin)
• What are the SI units for electric current?

  A (amperes)
• How are the SI units of force derived?

  By multiplying the units of mass and acceleration ($kg \times m s^{-2}$)
• What are the SI units of force?

  $kgm s^{-2}$ (also known as N)
• What are the SI units of energy?

  $kgm^2 s^{-2}$
• What are the SI units of charge?

  As (ampere seconds)
• What are the SI units of voltage?

  $kgm^2 s^{-3} A^{-1}$
• What is the multiplier for the prefix Tera (T)?

  $10^{12}$
• What is the multiplier for the prefix Giga (G)?

  $10^{9}$
• What is the multiplier for the prefix Mega (M)?

  $10^{6}$
• What is the multiplier for the prefix Kilo (k)?

  $10^{3}$
• What is the multiplier for the prefix Centi (c)?

  $10^{-2}$
• What is the multiplier for the prefix Milli (m)?

  $10^{-3}$
• What is the multiplier for the prefix Micro (µ)?

  $10^{-6}$
• What is the multiplier for the prefix Nano (n)?

  $10^{-9}$
• What is the multiplier for the prefix Pico (p)?

  $10^{-12}$
• What is the multiplier for the prefix Femto (f)?

  $10^{-15}$
• Convert 76 MeV to joules.

  $1.216 \times 10^{-11} J$
• Convert 1 kWh to joules.

  $3.6 \times 10^{6} J$
• What are the steps to convert mega electron volts (MeV) to joules?

  1. Convert from MeV to eV by multiplying by $10^{6}$
  2. Convert to joules by multiplying by $1.6 \times 10^{-19}$
• What are the steps to convert kilowatt hours (kWh) to joules?

  1. Convert 1 kW to joules per second: 1000 J/s
  2. Convert 1 hour to seconds: 3600 s
  3. Multiply: 1000 J/s * 3600 s = $3.6 \times 10^{6}$ J
• What are the SI units of speed?

  $m s^{-1}$
• What are the SI units of acceleration?

  $m s^{-2}$