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Electrical devices need an electrical circuit.
Thomas Edison
Because in the switch there is
The first person to get killed by a lightning strike.
You need a grounding system that follows the local electrical code.
To protect ourselves from infectious diseases
There are scammers on the internet and we need to protect ourselves against them.
with their teeth and claws
Anyplace there is a need to protect the electrical wiring from an overload or short in the wiring.
Since earthquakes can be enormously destructive, we as a society need to know as much as we can about them, in order to better protect ourselves.
An OSHA hazardous chemical is regulated because it is hazardous and people need to be able to protect themselves from the hazard.
Electrical devices need an electrical circuit.
Need product or environment
Our bodies need energy, and materials to repair and strengthen ourselves.
Saving energy will (a) save you money, and (b) help protect the planet, since using a lot of energy usually harms the planet.
we need to discipline ourselves
If u don't you'll dies