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Warm-Up:1. What does it mean for a particle to have a “charge”?2. When do you observe static electricity?
The strength of the electric force depends on the size of the charges and the distance between two objects
An object can gain a charge through several ways.
Friction may “wipe” electrons from one object and transfer them to another.
Charging by conduction happens when electrons are transferred from one object to another by direct contact.
Conservation of charge: no charge is ever created or destroyed. Electrons simply move from one atom to another.
Warm-Up:1. What subatomic particles move to create an electric charge?
2. What is the force between two charged objects called?
Warm-Up:1. What are the negatively charged particles in a atom called?
2. Like charges _______, opposite charges ________.
Warm-Up: 1. Why are lightning rods made of metal?2. Why must electrical wires have plastic and metal?
Warm-Up: 1. If an object continues to gain more and more electrons, it gains a ________charge.
2. What is the “spark” that you notice when you touch another person or object?
1. A toaster draws 10A of current. All homes in the US receive 120 V at the outlets. What is the power of the toaster?
2. A car uses a 12V batter. One headlight draws 3A. What is the power of the headlight?
Warm-Up:1. A flashlight uses a 1.5V battery and uses 9 watts of power. How many amps does it draw?
2. A fan (plugged into a home in Lawrenceville) uses 480 watts of power. How many amps does it draw?
Current is the rate at which charge passes through a given point and is measured in amperes or amps (A).
Warm-Up: 1. Which wire has more resistance?
2. Which type of circuit has more than one pathway for electrons to flow?
Warm-Up:1. In which kind of circuit are the components connected in a single loop?
2. What is used to open and close a circuit?
Illustrated Dictionary:box 1: Name & periodbox 2: Electric forcebox 3: Electric currentbox 4: Static electricitybox 5: Static dischargebox 6: 3 ways to chargebox 7: Parallel circuitbox 8: Series circuit
Target (#9):
1. What contains a strip of metal that melts if the current is too high in a circuit?
2. What are the three ways charging can happen?
Target: For each picture, tell whether it is an example of conduction, induction, friction, or electric discharge:
Target: copy these film questions on a separate piece of paper:1. Electrons flow in a closed path called a ___.2. _____metal conducts electricity better than____metal.3. Who figured out how to make electricity?4. Material that allows electricity to pass through it is a __________.
Create a poster that illustrates the factors that affect resistance: -material-thickness-length-temperature