Electrical Hazards
Operating an electrical switch is like turning on a water
faucet. Behind the faucet (or switch) there is a source of water (or
electricity), a way to transport it, and pressure to make it flow. The faucet's
water source is a reservoir or pumping station. A pump provides enough pressure
for the water to travel through the pipes.
The switch's electrical source is a power generating station
– a dam, or a coal or natural gas power plant. A generator provides the
pressure for the electrical current to travel or flow through electrical
conductors or wires.
Three factors determine the resistance of a substance to the
flow of electricity:
• What it
is made of.
• Its size.
• Its
temperature.
Substances with very little resistance to the flow of
electrical current are called conductors. Examples are metals.
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