Electricity

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Electricity
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Investigating Electric Charges

• One of the most common effects of static
  electricity occurs when you comb your hair on a
  day when the air is very dry. Your hair stands on
  end, and there may be a crackling noise.
• Another example of static electricity is when
  clothes cling together in the dryer.

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Law of Static Electricity

• The law states that
• Like charges repel (push away from each other) ?
  - and - , OR and .
• Unlike charges attract (move towards each other)
  ? and -, OR and .
• A charged object will attract a neutral object ?
  - and neutral, OR and neutral.

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Three Ways of Charging Objects Statically

• Friction
• rubbing two different substances together.
• - Results in opposite charges on the two
  substances/objects one ends up with a positive
  charge the other ends up with a negative charge.

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Ways to charge objects

• 2. Conduction
• - also referred to as contact and involves
  touching a neutral object with a charged one.
• -results in the same charge being left on the
  neutral object as was on the original charged
  object.

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Ways to charge objects

• 3. Induction involves a two step process.
• i) a charged object is brought close to but not
  touching a neutral object
• ii) the neutral object is then grounded
• -the grounding is then removed and then the
  charged object is removed.
• - results in the opposite charge being left on
  the neutral object as compared to the original
  charged object.

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Grounding

• Process by which an object is connected to the
  Earth.
• Can be achieved by connecting a wire to the
  object and the ground or simply by touching the
  object with your finger.