How do batteries work?

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** Power System **

-What are possible power sources for satellites?-

* How do batteries work? *

Electricity, as you probably already know, is the flow of electrons through
a conductive path like a wire. This path is called a /circuit/.

Batteries have three parts, an /anode/ (-), a /cathode/ (+), and the
/electrolyte/. The cathode and anode (the positive and negative sides at
either end of a traditional battery) are hooked up to an electrical
circuit.

The chemical reactions in the battery causes a build up of electrons at the
anode. This results in an electrical difference between the anode and the
cathode. You can think of this difference as an unstable build-up of the
electrons. The electrons wants to rearrange themselves to get rid of this
difference. But they do this in a certain way. Electrons repel each other
and try to go to a place with fewer electrons.

In a battery, the only place to go is to the cathode. But, the electrolyte
keeps the electrons from going straight from the anode to the cathode
within the battery. When the circuit is closed (a wire connects the cathode
and the anode) the electrons will be able to get to the cathode. In the
picture above, the electrons go through the wire, lighting the light bulb
along the way. This is one way of describing how electrical potential
causes electrons to flow through the circuit.

However, these electrochemical processes change the chemicals in anode and
cathode to make them stop supplying electrons. So there is a limited amount
of power available in a battery.

When you /recharge/ a battery, you change the direction of the flow of
electrons using another power source, such as solar panels. The
electrochemical processes happen in reverse


Source: www.qrg.northwestern.edu/projects/vss/docs/power/2-how-do-batteries-work.html


how do batteries work


Battery (electricity) - Wikipedia, the free encyclopedia

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** Battery (electricity) **

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For other uses, see Battery (disambiguation).


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Various cells and batteries (top-left to bottom-right): two AA, one D, one
handheld ham radio battery, two 9-volt (PP3), two AAA, one C, one camcorder
battery, one cordless phone battery.

In electricity, a *battery* is a device consisting of one or more
electrochemical cells that convert stored chemical energy into electrical
energy.^[1] Since the invention of the first battery (or "voltaic pile") in
1800 by Alessandro Volta and especially since the technically improved
Daniell cell in 1836, batteries have become a common power source for many
household and industrial applications. According to a 2005 estimate, the
worldwide battery industry generates US$48 billion in sales each year,^[2]
with 6% annual growth.^[3]

There are two types of batteries: primary batteries (disposable batteries),
which are designed to be used once and discarded, and secondary batteries
(rechargeable batteries), which are designed to be recharged and used
multiple times. Batteries come in many sizes, from miniature cells used to
power hearing aids and wristwatches to battery banks the size of rooms that
provide standby power


Source: en.wikipedia.org/wiki/Battery_(electricity)

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