Static and Current Electricity April 2006 BY: BRIANNA SHIELDS

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  • Static and Current ElectricityApril 2006

    BY: BRIANNA SHIELDS

  • DO NOW1. 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 cant you hear a sound in outer space?

  • GOALTo differentiate between static and current electricity

  • Fill in the answers to the video questions while you watch the video.

  • Proton = P= (+) = nucleusNeutron = N = (0) = nucleusElectron = E = (-) = outside nucleus

  • Bohr Model of an Atom8P 8N

  • More on subatomic particlesNeutral atom

    Forces # P = # E

    1. P-E = attract2. P-P = repel3. E-E = repel

  • How do atoms become charged??

  • Static ElectricityStatic Electricity1. The accumulation of extra negative e- on an object

    2. Only e- can be transferred

    3. Opposite charges attract

    4. Like charges repel

  • Static ElectricityStatic Electricity Example5. Extra e- = negatively charged object/atom

    6. Missing e- = positively charged object/atom

  • For each of the following static electricity examples you must do the following: 1. Draw a picture2. Accompany it with an explanation

  • 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 atomsElectrons rubbed off carpet and onto your feetShoe has extra es (negative chg)Rug is missing es (positive chg)Extra electrons from the shoe are transferred to the doorknob in the form of an electrical spark

  • 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).

  • Scenario 3: Charging by Induction- charged object and neutral object attract when atoms in neutral object rearrange their protons and electronsRub 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

  • Scenario 4: Charged skotch tapeRipping 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

  • Scenario 5: Flying PepperCharging the rod with fur transfers es to the rod

    Neutral pepper experiences rearrangement of the es so the ps on top are attracted to the pepper

  • Scenario 6: Bending WaterCharge the rod, bring it close to water

    It rearranges the electrons in the water causing them to be attracted to the negative rod

  • Scenario 7: ElectroscopeThe negatively charged rod transfers electrons to the metal knob

    The es travel down the metal rod into the aluminum foil

    Each piece of foil, then has a negative charge- so they repel

  • Scenario 8: LightningThe accumulation of negative charge in clouds

    Electrons transfer to positively charged ground to even out the charge

    Produces electrical spark known as lightning

  • Conductors & InsulatorsConductor

    Insulator

    1. A material that allows e- to move easily through2. Metals

    1. A material that resists e- flow2. Plastic, wood, rubber, glass

  • CircuitsCurrent ElectricityCreates continuous e- flow

  • CircuitsParts of a circuit1. Source Battery-pumps electronsFlows from - to + end

  • CircuitsParts of a circuit2. Wire Creates path for e- flow

  • CircuitsParts of a circuit3. Load Resists e- flow, converts it to light or heatBulbs, toasters

  • CircuitsParts of a circuit4. Switch Opens and closes circuit pathOpen circuit= no e- flow

  • Examples of simple circuits

  • Circuit must be closed for electrons to flow..

  • CircuitsTypes of circuitSERIES Parts connected in a continuous path (one loop)A break disconnects the whole circuit

  • CircuitsTypes of circuitParallel Contains various paths for e- flow (branches)If theres a break, e- can take a different path

  • Electricity Review SitesInteractive ElectricityMr Blobz Electricity

  • Circuit Drawings1. Draw a circuit in series with one source, one switch and 4 loads2. Draw a circuit in parallel with two wire loops, each with a load, one switch and one source

  • Reviewing Circuits

  • Reviewing Circuits

  • Reviewing Circuits

  • Reviewing Circuits

  • Reviewing Circuits

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