What are S.I. Units and why do we need them? Teacher Zyen explains it in this video.
Here is a list of S.I. Units of some common physical quantities.
| Physical Quantity | S.I. Unit |
| Length | metre (m) |
| Time | second (s) |
| Mass | kilogram (kg) |
| Temperature | Kelvin (K) |
| Electric current | Ampere (A) |
| Voltage | Volt (V) |
| Resistance | ohm (Ω) |
| Force / Weight | Newton (N) |
| Pressure | Pascal (Pa) |
| Energy | Joule (J) |