- Nickel Cadmium Batteries
The nickel-cadmium battery (NiCad) is a popular type of rechargeable battery used in portable power tools.
- Non-Ferrous Metal
The term non-ferrous is used to indicate metals other than iron and iron alloys that do not contain an appreciable amount of metals, especially aluminum, copper, brass or bronze.
- Non-Renewable Resources
Energy sources that are used and consumed faster than they are produced by nature are referred to as non-renewable. These include coal, natural gas, oil and other fossil fuels.