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Static and Current Electricity

Static and Current Electricity. April 2006 BY: BRIANNA SHIELDS. DO NOW. 1. What type of wave is a sound wave? 2. Which type of wave from the electromagnetic spectrum has the least amount of energy and the longest wavelength? 3. Why can’t you hear a sound in outer space?. GOAL.

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Static and Current Electricity

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  1. Static and Current Electricity April 2006 BY: BRIANNA SHIELDS

  2. DO NOW • 1. What type of wave is a sound wave? • 2. Which type of wave from the electromagnetic spectrum has the least amount of energy and the longest wavelength? • 3. Why can’t you hear a sound in outer space?

  3. GOAL • To differentiate between static and current electricity

  4. Magic School Bus........ ELECTRICITY!!!!! Fill in the answers to the video questions while you watch the video.

  5. Proton = P= (+) = nucleus • Neutron = N = (0) = nucleus • Electron = E = (-) = outside nucleus

  6. Bohr Model of an Atom 8P 8N

  7. Neutral atom Forces # P = # E 1. P-E = attract 2. P-P = repel 3. E-E = repel More on subatomic particles

  8. How do atoms become charged??

  9. Static Electricity 1. The accumulation of extra negative e- on an object 2. Only e- can be transferred 3. Opposite charges attract 4. Like charges repel Static Electricity

  10. Static Electricity Example 5. Extra e- = negatively charged object/atom 6. Missing e- = positively charged object/atom Static Electricity

  11. For each of the following static electricity examples you must do the following: • 1. Draw a picture • 2. Accompany it with an explanation

  12. Scenario 1: If you shuffle your feet on the carpet, then reach out to touch a metal door knob, you receive a shock by a spark- explain why? • Rubbing disturbs the atoms • Electrons rubbed off carpet and onto your feet • Shoe has extra e’s (negativechg) • Rug is missing e’s (positivechg) • Extra electrons from the shoe are transferred to the doorknob in the form of an electrical spark

  13. Scenario 2: Clothing sometimes clings together upon removal from the dryer- Why? • Electrons rub off clothes and stick to others • Some items get a negative charge • These clothes are attracted to the ones with a positive charge (clothes missing electrons).

  14. Scenario 3: Charging by Induction- charged object and neutral object attract when atoms in neutral object rearrange their protons and electrons • Rub a balloon w/ a cloth to charge it, it accumulates extra negatives on it • Bring it close to a wall and it rearranges the atoms on the wall • It pulls protons closer and pushing electrons away

  15. Scenario 4: Charged skotch tape • Ripping the tape off the desk gives it a charge • When the charged rod is brought up to the piece of tape it is either attracted or repelled

  16. Scenario 5: Flying Pepper • Charging the rod with fur transfers e’s to the rod • Neutral pepper experiences rearrangement of the e’s so the p’s on top are attracted to the pepper

  17. Scenario 6: Bending Water • Charge the rod, bring it close to water • It rearranges the electrons in the water causing them to be attracted to the negative rod

  18. Scenario 7: Electroscope • The negatively charged rod transfers electrons to the metal knob • The e’s travel down the metal rod into the aluminum foil • Each piece of foil, then has a negative charge- so they repel

  19. Scenario 8: Lightning • The accumulation of negative charge in clouds • Electrons transfer to positively charged ground to even out the charge • Produces electrical spark known as lightning

  20. Conductor Insulator 1. A material that allows e- to move easily through 2. Metals 1. A material that resists e- flow 2. Plastic, wood, rubber, glass Conductors & Insulators

  21. Current Electricity Creates continuous e- flow Circuits

  22. Parts of a circuit 1. Source Battery-pumps electrons Flows from - to + end Circuits

  23. Parts of a circuit 2. Wire Creates path for e- flow Circuits

  24. Parts of a circuit 3. Load Resists e- flow, converts it to light or heat Bulbs, toasters Circuits

  25. Parts of a circuit 4. Switch Opens and closes circuit path Open circuit= no e- flow Circuits

  26. Examples of simple circuits

  27. Circuit must be closed for electrons to flow……..

  28. Types of circuit SERIES Parts connected in a continuous path (one loop) A break disconnects the whole circuit Circuits

  29. Types of circuit Parallel Contains various paths for e- flow (branches) If there’s a break, e- can take a different path Circuits

  30. Electricity Review Sites • Interactive Electricity • Mr Blobz Electricity

  31. Circuit Drawings • 1. Draw a circuit in series with one source, one switch and 4 loads • 2. Draw a circuit in parallel with two wire loops, each with a load, one switch and one source

  32. Reviewing Circuits

  33. Reviewing Circuits

  34. Reviewing Circuits

  35. Reviewing Circuits

  36. Reviewing Circuits

  37. Draw the following circuit examples on your handout: • Circuit in series with one source, one switch and 4 loads • Circuit in parallel with three wire loops, one source, one switch and three loads (one on each loop).

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