Contents
Key Stage 3
Meaning
A Joule is a unit for measuring energy
About Joules
- Joules are the scientific unit for measuring energy.
- A number of Joules is written with a capital J.
Unit Comparisons
| Unit | In Joules |
| 1 Calorie | 4.2J |
| 1 kilocalorie | 4200J |
| 1 kilowatt-hour | 36,000,000J |
Converting to Joules
| Unit | To convert | Joules |
| 1 Megajoule (1MJ) | Convert to Joules x1000,000. | 1000,000J |
| 1 kilojoule (1kJ) | Convert to Joules x1000. | 1000J |
| 1 Joule (1J) | Convert to Joules x1. | 1J |
| 1 millijoule 1(mJ) | Convert to metres /1000. | 0.001J |
| 1 microjoule 1(µJ) | Convert to Joules /1000,000. | 0.000001J |
Key Stage 4
Meaning
Joules (J) are the SI Unit for energy.
About Joules
- Joules are shortened to an upper case J.
Converting to Joules
| Unit | To convert | Joules |
| 1 megajoule (1MJ) | Convert to joules x106 | 1x106J |
| 1 kilojoule (1kJ) | Convert to joules x103 | 1x103J |
| 1 Joule (1J) | Convert to joules x1 | 1J |
| 1 millijoule 1(mJ) | Convert to joules x10-3 | 1x10-3J |
| 1 microjoule 1(µJ) | Convert to joules x10-6 | 1x10-6J |
| 1 nanojoule 1(nJ) | Convert to joules x10-9 | 1x10-9J |