1. Resistance

2. Resistance  As space narrows the resistance to movement increases

3. Electrical Resistance  Where do we find the resistance in a light bulb?

4. What is resistance?  The "resistance to flow of electricity through a material." electricity electricity  Even the best Conductors, (i.e. Gold) have some Resistance.  Resistance Elements fall somewhere between a Conductor and an Insulator.  Resistance can also be considered a measurement of how tightly a material holds onto its Electrons

5.  Electrical Resistance is measured in "ohms."  The lower the Resistance of a material, the better the material acts as a Conductor.  Copper has a lower Electrical Resistance than Aluminum; Copper is a better Conductor.  The "resistance value" for most materials is listed in physics or science books.

6. Like….water – what else?  We can use a water piping system as an analogy.  The Resistance in the Water Pipe to the flow of water comes mainly from the size of the Pipe.  Rust and corrosion inside the Pipe, objects stuck inside the Pipe, and the number of "bends" and Fittings all add up to increase the Resistance to the flow of water.

7.  The same is true of current flow in an Electric Circuit.  A number of factors determine the Resistance to current flow  Wire diameter  Wire length  impurities in the wire's makeup.  For example, smaller wires have more Resistance than larger diameter wires  Longer wires have more Resistance than shorter wires.

8. Light Bulbs  When electricity flows through any Resistance, energy is dissipated in the form of heat.  If the heat becomes intense enough, the Conductor Resistor may actually "glow".  This is how an Incandescent Light Bulb works.  The Filament is made of a material that will resist the current enough to heat up and "glow".

9.  Symbol for Electrical Resistance, ( measured in "Ohms,“) is the Greek letter "Omega". Ω  Electricians and practical Wiring Books typically use an "R" to represent Resistance.