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Essential Question: How do electrons get transferred: Conduction Induction Friction What is the law of conservation of charge? Charges are not created nor destroyed, they are transferred from one object to another. Explain why a sock might stick to a sweater after they have been in the dryer? The friction (from rubbing) between the sock and the sweater causes one to lose electrons and the other to gain electrons, making them electrically charged. They will get attracted to each other since they have opposite charges. Your Question : What is the difference between a cation and anion? Cations: lose electrons and become positively charged. Anions: gain electrons and become negatively charged. Essential Question: How can I tell if something is charged? (pg. 13) By using an electroscope. The leaves of an electroscope will repel each other if you bring a charged object close to it. What tool is used to detect electric charge? Electroscope Your Question: What is static electricity? Build up of electrons Essential Question: What is Ohm’s Law? (p.g 17) The relationship between current, voltage, and resistance. It is represented in the following equation: V = IR What is current? Current is the flow of electrons What happens to the resistance of a light bulb as it heats up? As the light bulb heats up the resistance increases. Your Question: What is the equation for Ohm’s law? What does each symbol mean? V = IR V= Voltage, measured in volts (V) I = Current, measured in Amps (A) R= Resistance, measured in Ohms (Ω) How are semiconductors used in circuits? (pg. 23) They are used in diodes and transistors. What is a diode? Electronic component that converts an AC current to DC current. What devices around my home use diodes? Solar panels, TV remotes, light fixtures What are transistors? Electronic device that converts small amount of current to large amount of current. Essential Question: What is a magnet? (pg. 25) It is an object that attracts iron, or attracts objects that contain iron. Where does a magnet create the strongest magnetic force? At the poles (N and S poles) Your Question: What is an electromagnetism? Magnetic field produced by electric current. Where does a magnet create the strongest magnetic force? At the poles How could a regular iron nail be turned into a magnet? By wrapping a wire around it and running a current through the wire. Your Question: How could a magnet get destroyed? 1. By Striking it really hard (ie. Strike it with a hammer) 2. By heating up the magnet What happens if you cut a magnet in half? You will end up with two perfectly functioning magnets each with a north and south pole. Essential Question: What does a generator do? (pg. 29) It changes mechanical energy into electrical energy. What kind of energy conversion does an electric generator do? It converts mechanical energy into kinetic energy. Explain how burning fossil fuels can help us make electrical energy? Burning fossil fuels heat water turns water into steam Steam rises turns turbines that are connected to generators generator creates electricity. Where are electric generators used? They are used in electric power plants to generate electricity. Essential Questions: What is an electric motor? (pg. 31) Device that changes electric energy into kinetic energy. What kind of energy conversion does an electric motor do? It converts electric energy into kinetic energy.