-5-
About Electricity
9. What is Current?
10. What is Voltage?
11. Electricity Generation
12. Battery Recycling
Q: What is current? Is that like water flow? Can it flow too?
A: Yeah, good question. Electric current can flow too, but it
is totally different from water flow. Electric current is a flow
of electric charge.
Q: What is voltage?
A: Voltage is equal to the work done per unit of charge against
a static electric field to move the charge between two points.
A voltage may represent either a source of energy
(electromotive force), or lost,
used, or stored energy (potential
drop).
Q: How do they make electricity for daily use?
A: There are seven fundamental
methods of directly transforming
other forms of energy into electrical
energy:
fossil-fuel,
biomass,
hydro/tidal,
wind,
nuclear,
mechanical power generation, and
solar thermal energy. Certainly there
will be more methods for electricity
generation to be found, since the
scientists are always researching.
Q: How do we recycle used batteries?
A: Battery recycling aims to reduce the number of batteries being
disposed as municipal solid waste. Batteries contain a number of
heavy metals and toxic chemicals and their dumping has raised concerns
over soil contamination and water pollution. Most typical kinds of batteries
can be recycled. However, some batteries are recycled more readily than
others, such as lead-acid automotive batteries (nearly 90% are recycled)
and Press Switch cells (because of the value and
toxicity of their chemicals). Other types, such as
alkaline and rechargeable, e.g., nickel-cadmium
(Ni-Cd), nickel metal hydride (Ni-MH), lithium-ion (Li-
ion) and nickel zinc (Ni-Zn), can also be recycled.
So kids, please do something for battery recycling
in our daily life from now on.
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