Transcript Cells_and_Batteries[1]

CELLS AND BATTERIES
An electrochemical cell can be used to
generate a current without plugging into
an outlet.
The cell consists of two different metal
pieces called electrodes.

The metals are in a solution, called an
electrolyte which reacts with the metal to
free up some electrons. The two eletrodes
are kept seperated so that the electrons
can move between them throught the
soultion. When a wire is connected to
each end of the cell, the electrons move
through the conductor to get to the other
side, creating a current through the
conductor..

Electrons are always repelled away from
the negative end of a cell and move
through the circuit and into the positive
end where they are attracted


When you connect
several cells together,
it is called a battery.
Different voltages of
batteries are created
by connecting
together different
numbers of cells.

There are two types
of batteries: primary
and secondary
Electrochemical Cells
Primary
- Single use
Secondary
- Multiple use
- Can be discharged but - Can be discharged and
not recharged
recharged
- Only one chemical
reaction
- 2 chemical processes;
one to discharge, one to
recharge
List advantages and disadvantages of each
Primary
Secondary
Advantage:
Advantage:
- Has only one chemical reaction
- Can be used multiple times
Disadvantage:
Disadvantage:
- Can only be used once
- Has 2 chemical processes
Electric Circuits
A controlled path of moving electrons is
called a ciruit.
In order for electrons to move, there
must be a continuous, complete path
between a positive terminal and negative
terminal.
This is called a complete circuit.
If the path is broken at any point, then the
circuit is called incomplete.
There are 3 major parts that all circuits
need.
These are the energy source, the path
and the load.
Most circuits also have a switch,
though that is not always necessary.
Part of circuit
Function
Examples
Energy Source
Supply electrons
Batteries, fruit,
Path
Transfer electrons
Wire
Load
Converts energy into
useful forms
Bulb, motor, resistor,
Switch
Opens and closes the
path
Light switch