Page 128 - Science Class 07

where the electron flow is cut because the The Load
path is broken. An open circuit does not allow The load is a small light bulb or buzzer that
electrical current to flow. lights when the circuit is turned on. The load is

also known as a resistor.

Switch
Cell
Simple Electric Circuit

PARTS OF ELECTRICAL CIRCUIT AND ITS
SYMBOLS Bulb
Cell
It is very important to know the basic parts of a
simple circuit and the symbols that are related The power source is a cell. (Note that more
to it. A simple circuit has conductors, a switch, than one cell put together is known as a
a load and a power source. ba ery.)

Here are the func ons of each part:
Conductors

These are usually copper wires with no
insula on. They make the path through which
the electricity flows. One piece of the wire Ba ery
connects the current from the power source
(cell) to the load. The other piece connects the
load back to the power source.

A simple circuit diagram
consis ng of a ba ery, a
switch and a lamp.
Copper Wire
It is important to draw circuits with clean
Switch
straight lines, as shown above. Avoid realis c
The switch is simply a small gap in the sketches. It is important to know that a circuit
conductor where you can close or open the can have more than the basic components in
circuit. When the switch is closed, the circuit is the diagram. It can have two or more ba eries
closed and electricity flows. or two or more bulbs.

128 Science-7