2Warm Up3. Study the picture above. When the sun comes out, the snowman melts, or changes from ____.solid to liquidliquid to solidgas to liquidsolid to gas4. Buoyancy is__________The ability for an object to floatTo form a solution with another materialThe amount of matter something contains.evaporation1. In the diagram above, the water in the pan is changing from a liquid to a gas, or ____.a. Melting c. condensingb. freezing d. evaporating2. What is matter?The amount of matter something contains.Everything in the universe that has mass and takes up spaceThe amount of salt in waterThe amount of space that matter takes up.
3What is a conductor?A conductor is something which allows electricity to flow through.An example of a conductor is:ScissorsPaper clipAluminum foilIronSteelCopper
4What is a Insulator?An insulator is what makes electricity from not flowingExamples of insulators are:CottonPaperPlasticGlassRubber
6Lets demonstrate…. Materials Needed: 1.2-volt lightbulb, a matching lightbulb base,a D-cell battery,a bananathree pieces of copper wire with theinsulation stripped off the ends.
7ProcedureDraw the following picture in your science journal.
8Let me demonstrate…Set up the equipment as shown and tape the wires to the battery.Does anything happen?Does the banana allow electricity to flow through the circuit and light the bulb?Is it a conductor or an insulator? Why or why not?
9What is a circuit tester? Example of a circuit tester Now its your turn…What is a circuit tester?Use of a circuit tester: To test whether the material is a good electrical conductor.Example of a circuit tester
10Inquiring Minds Want to Know. Conductor or Insulator Inquiring Minds Want to Know! Conductor or Insulator? That is the question!Now take the bag of materials and spread them out in front of you.Draw the following table in your journal.As you test each item, record whether it was a conductor or and insulator with aItemConductorInsulatorDid the bulb light?SpoonPaper clippencilRubber banderaserFoilNailcoin
11How to use a circuit tester? Step 1: Set up the circuit tester as shown above.Step 2: Place the object between the open ends of the wire.
12How to use a circuit tester? If the bulb lights up, it means the material allows electric current to flow through the closed circuit.The brighter the bulb, the better the conductor of electricity is the material.
13Now write your conclusion based on your investigation… What objects were conductors of electricity? Why?What objects were insulators of electricity?Did any of the conductors have common characteristics?What about the insulators?How would knowing the difference between conductors and insulators help you in the real world?
14Conclusions…Conductors allow electricity flow through them. Conductors are materials that can carry electricity - they conduct electricity. Metal materials such as copper, iron, steel and aluminum are all good conductors of electricity.Insulators do not allow electricity to flow through them. Materials such as wood, plastic, rubber and glass do not carry electricity and are called insulators – they don’t conduct electricity.