Presentation on theme: " What are the parts of an atom? Which particles are positively charged? negative? neutral? What are the two Laws of Electrical Charge? Opposites."— Presentation transcript:
Which particles are positively charged? negative? neutral? What are the two Laws of Electrical Charge? Opposites attract Positives and Negatives attract Neutral EXTRA: like charges REPEL (hair… two balloons)
Is this balloon neutral? How will this balloon react if I place it against a neutrally charged wall?
Two types of Electricity: 1) Static (Not Moving) 2) Current (Moving)
Static Electricity - Electric charges that aren’t moving - These build up when charged are transferred from one object to another (friction) Electrical Discharges - When charged objects lose their charges (the balloon) - This can be quiet and invisible (like the balloon) - This can also be loud and visible (lightning)
Electric Discharges can be dangerous - Lightning can destroy stuff - Small charges can wreck computers
Grounding - One way to discharge static electricity is to touch a metal rod that touches the ground (called Grounding) - The charge then goes into the earth Ex.: touch a chair leg before using a computer Ex.: tall building use lightning rods to ground themselves (the charge goes into the ground) Ex.: People put fabric softeners in the laundry machine (lessens the buildup of charges)
Question: Which pairs of materials will become charged when rubbed together? Hypothesis: Come up with some objects and make guesses whether it will work. Experiment. Observe: What happened? Conclusion: Which pairs worked? What does this tell you about their charges?