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Voltage and Electric Fields

Voltage and Electric Fields. Sparks will fly. Going back to gravity for a moment. Think about gravity a moment: Anything near the earth is pulled in by earth’s gravity There is a gravity field (force field) around the earth Anything put into this field is then affected by the gravity.

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Voltage and Electric Fields

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  1. Voltage and Electric Fields Sparks will fly

  2. Going back to gravity for a moment • Think about gravity a moment: • Anything near the earth is pulled in by earth’s gravity • There is a gravity field (force field) around the earth • Anything put into this field is then affected by the gravity

  3. Electric fields • Likewise, a single electric charge has an ELECTRIC field around it, similar to the gravitational field around the earth • We know that pairs of charges exert forces on one another • So the electric field around a charge is a field that other charges would interact with if they were put into it.

  4. Field lines around single charges http://downloadanswer.com/images/ab_Electricity7.JPG

  5. Field lines around more charges http://www.iop.org/activity/education/Teaching_Resources/Teaching%20Advanced%20Physics/Fields/Images%20400/img_tb_4734.gif

  6. About Field Lines • Field lines start on positive charges • Field lines end on negative charges • They show the direction of the electric force that would be there if you put a small, positive charge near the original charges

  7. Check for Understanding • Once again with the volunteers

  8. Electrical Shielding • Recall that the charges placed on a conductor reside on the outside surface. • Using this phenomenon, you can shield sensitive electronics from charges outside. • Anything placed inside a hollow conductor will be shielded.

  9. Voltage/Electric Potential • The terms “voltage” and “electric potential” mean the same thing. • Voltage is what provides the “pull” on charges to make them move • Voltage is measured in volts

  10. Voltage continued • Think about what happens when you separate positive charges from negative charges. • The two are attracted to one another and they want to reunite • Whenever you have a separation of charges, you have a voltage. • The more charges that are separated, the more they want to get back together

  11. Common voltages • The voltage of a AA battery is 1.5 volts • The voltage of a car battery is 12 volts • What is the voltage of a 9-volt battery? • The voltages from the Van de Graaf Generator can be 40,000 volts or higher • Lightning is millions of volts

  12. Check for Understanding • Once again with the volunteers

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