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Science 909 > Static Electricity > Flashcards

Static Electricity Flashcards

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1
Q

True or False: All atoms in matter contain electric charges.

A

True

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2
Q

Who was the first to name charges positive and negative?

A

Benjamin Franklin

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3
Q

Name of Franklin’s famous experiment with lightning?

A

The kite and key experiment

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4
Q

How are charges made ?

A

Charges are created when electrons are forced to move, such as when objects of different materials are rubbed together

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5
Q

True or False: Some objects can remain charged very briefly, while some stay charged for up to months?

A

True

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6
Q

What happens when two different neutral substances are rubbed together?

A

One becomes negatively charged and the other becomes positively charged.

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7
Q

True or False: Like electric charges attract and unlike charges repel.

A

False, Like charges repel and unlike charges attract.

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8
Q

What is Static Electricity?

A

Static electricity is the build up of negative charges in one place

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9
Q

True or False: Static Electricity is referred to as static because it moves around.

A

False, Static Electricity is referred to as static because it does not move.

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10
Q

True or False: Static Electricity needs a conductor

A

False, It needs an Insulator

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11
Q

What are Insulators?

A

Insulators are materials that do not allow electrical charges or heat to move freely on or through it

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12
Q

What are Conductors?

A

Conductors are materials that allow electric charges or heat to move freely on or through it.

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13
Q

True or False: Insulators are normally non-metals and Conductors are usually metals.

A

True.

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14
Q

True or False: Graphite is an Insulator

A

False, Graphite is a conductor

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15
Q

True or False: Glass is an Insulator

A

True.

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16
Q

True or False: When a charged object is placed next to a neutral object, the objects can still be attracted to one another

A

True

17
Q

How come when a charged object is placed next to a neutral object, the objects can still be attracted to one another

A

A positively charged object will pull at the end of the object so that the end has an excess of negative charges
The opposite end becomes slightly positive
The overall charge of the object is still neutral, but the charges are just rearranged

18
Q

What is an Electroscope?

A

A device for detecting the presence of an electric charge

19
Q

Try to explain an Electroscope in your own words…

A

Good (You should probably double-check !)

20
Q

What is Induction?

A

The process by which an object having an electric charge produces the opposite charge in a neighboring object without actually touching it.

21
Q

How do electrons move through a conductor?

A

By jumping form one metal atom to the other.

22
Q

True or False: Silver is better than aluminum because electrons move more freely in silver

A

True.

23
Q

Fun Fact:

A

Some insulators work better than others also!

They hold onto electrons very tightly

24
Q

True or False: It is not possible for a material to be in between an Insulator and a Conductor.

A

False, Some materials are in between insulators and conductors. They allow electrons to move, but not very freely. These are known as fair conductors.

25
Q

True or False: Silicon and Carbon are examples of fair conductors.

A

True.

26
Q

What is a Spark?

A

An electrical discharge caused by electrons jumping from one conductor to another through air.

27
Q

How do Sparks from?

A

Sparks form when two objects with strong opposite charges approach each other

28
Q

What is Grounding?

A

To connect a conductor through some conducting material directly to the ground, or Earth

29
Q

What 3 things happen when there is lightning.

A
  • –Strong winds and collisions of water droplets and ice particles in clouds strip electrons from some particles and deposit them on others
  • –Negative charges collect at the bottom of clouds where the temperature is warmer
  • –Positively charged particles exist in the colder parts of clouds higher up
30
Q

How does Lightning work?

A
  • –Negative charges on the bottom of clouds repel electrons on the surface of the ground leaving the ground positively charged right below the cloud
  • –The negative cloud is then attracted to the positive ground
  • –The positive ground pulls electrons off atoms in the air
  • –Once a chain of ions forms, a discharge occurs between the cloud and the ground
  • –So many electrons pass through the air so quickly that the sky both lights up and heats up
31
Q

Why did Benjamin Franklin create lightning rods?

A

Benjamin Franklin invented the lightning rod so that when buildings were struck by lightning it would go straight through the rod into the ground

32
Q

What is the use of lightning rods?

A

They prevent the electricity from damaging the building or causing a fire

33
Q

How do Lighting rods work?

A
  • –Lightning strikes look for a path to connect to the ground
  • –If lightning strikes a building, it attaches to the conductive metal rod rather than the building
  • –Lightning rods do not attract lightning, rather they divert is away from the flammable parts of the structure
  • –The lightning rod spikes sticks out of the top of the building
  • –It is connected to a conductive wire that leads to a metal grid or rod in the ground

Science 909 (1 decks)

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