2. What Affects the Flow of Electricity?

3. Some materials are good conductors. Electricity flows best through conductors. The base and the wires of a light bulb are good conductors. The filament in a light bulb, however, is a poor conductor. It is a resistor. Current does not flow easily through resistors. Resistors allow electrical energy to be changed into other forms of energy. A light bulb gives off light and heat due to resistance in the filament.

4. The light and heat that a light bulb produces is evidence of energy transformations that occur in electrical circuits. The energy from electricity is transformed, or changed, into other forms of energy. In the example of a light bulb, electrical energy becomes light and heat – two different forms of energy. Sound and motion (or movement) are other examples of energy changing from one form to another.

5. Cause and Effect What is one effect of using a good conductor in an electrical circuit? Explain why a light bulb produces light and heat.

6. How can you tell electricity has changed into another form in a light bulb? Answer the question… –With a partner –In your Learning Notebook