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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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