Batteries and electric generators
circuit, the role of battery is to produce an electric current.
There are various kinds of batteries: round, flat batteries, button
However, all batteries have two terminals:
- A positive terminal marked with the symbol +
- A negative terminal marked with the symbol -
batteries, electric generators produce an electric current.
Nevertheless electric generators use mechanical energy whereas
batteries use chemical energy.
electric generators: dynamos, alternators in power plants and wind
Comment: Solar panels may also produce an electric current by using
An electrical component that may produce electric current is said to be
an " active component "
It is considered that other
components are " passive components "
A passive component therefore receives the electric current but doesn't
Examples of passive components: bulbs switches, motors.
They produce light thanks to their filament made of a metal
(tungsten) that is heated under the effect of the current until it
A switch is
used to control the operation of a circuit. For this electricity
lesson, we use only toggle switches or push button switches, but there
are many other models of varying complexity (magnetic, electronic, etc.)
4) Material to realize a
a connection means connect a two-terminal component to another so that
current can flow between them.
In an electrical device, two-terminal components are interconnected
with electrical wires and solders.
electricity lessons, we use connection wires whose ends consist of
They are designed to be connected to the banana sockets.
of flat batteries.
The flat batteries have no banana sockets therefore, to connect them,
we must use alligator clips that can be placed on banana plugs.
Bulbs haven't banana sockets. They are fixed by screwing on a support.
This support has two terminals consisting of banana sockets connected
to lamp terminals.
system is also used for other two-terminal components which do not have
a banana sockets