Download Current Electricity

Current Electricity
Current Electricity: is the
flow of an ectric charge
through a wire.
What is the difference between static
electricity and current electricity?
Static electricity is stationary or collects on the surface of
an object, whereas current electricity is flowing very
rapidly through a conductor.
The flow of electricity in current electricity has electrical
pressure or voltage. Electric charges flow from an area
of high voltage to an area of low voltage.
Water pressure
and voltage
behave in
similar ways.
Current Electricity (charge flows)…
Energy charges move easily through
conductors.
Do you remember what a good conductor is?
…Metals are the best conductors (remember
free electrons?)
Now, what is a bad conductor?
Plastic and rubber are great insulators…
HOW DOES A LIGHT BULB WORK?
When a light switch is off, a gap of
insulating air keeps charge from
flowing between two copper wires.
If you flip the switch you’ll close
the gap and bring the two wires
together.
When the wires touch, the electric
charge flows.
HOW DOES A LIGHT BULB WORK?
The flow of charge can now move from the
wall socket through the wires leading to the
lamp.
This charge flows through wires from your
local energy plant to your home, through the
wires in the walls, and finally to the socket.
HOW DOES A LIGHT BULB WORK?
• The charge flows through the plug
along the wires into the lamp and
then through a filament inside the
bulb.
• The filament is a conductor.
• As a charge passes through it, the
filament glows and emits light and
heat.
• The flow of charge then continues in
a circle.
What is electrical resistance?
Resistance (R)is the opposition to the flow of
an electric current, causing the electrical energy
to be converted to thermal energy or light.
The metal which makes up a
light bulb filament or stovetop
eye has a high electrical
resistance. This causes light
and heat to be given off.
THE END…