Van de Graff generator and Electrostatics

The device used for the demonstration is called a Van de ______ generator.

• Graf

• Graaf

• Graff

• Graaff

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NGSS.HS-PS2-5

How much voltage can a table top Van de Graaff generator build up?

• 1000 V

• 10,000 V

• 100,000 V

• 1000,000 V

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Why does a Van de Graaff generator make your hair stand up if you touch the dome?

• The current is trying to flow out of the hair ends.

• The electrons gather on the hair ends and repel each other.

• The hair is repelled by the dome of the Van de Graaff generator.

• The hair is attracted to the surrounding air.

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NGSS.MS-PS2-5

Why is it called a generator?

Because it generates

• mostly current and charge

• mostly charge and voltage

• mostly current and voltage

• only voltage

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Why is a Van de Graff generator so round in shape and not sharp or pointy?

• charge distributes equally all over the dome but tends to concentrate dangerously on the tip of a sharp object

• charge distributes dangerously all over a sharp object but tends to concentrate on the highest point of the dome

Why does a lightning rod prevent your house from being struck by a lightning bolt during a thunderstorm?

• It allows the leakage of electrons to earth, thereby preventing the build up of potential difference to a dangerously high level

• It allows the lightning bolt to strike it and allows electrons to flow to earth, leaving the house unharmed

• It repels electrons and doesn't allow them to flow to earth

• It acts as an insulator so it doesn't allow current to flow

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Which of the following is the most dangerous if a person is subjected to it?

• a large amount of charge

• a high current

• a high voltage

• a high potential difference

What does the earth/ground do?

• neutralises charged objects

• creates more charge

• acts as an insulator

• acts as voltage source

When a person touches a positively charged object,

• electrons flow from the object to the ground

• electrons flow from the ground to the object

• positive charge flows from the object to the ground

• positive charge flows from the ground to the object

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NGSS.HS-PS2-4

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The charge of an electron is -1e. This is equivalent to

• -1.6 x 10¹⁹ Coulombs

• -1.6 x 10⁹ Coulombs

• -1.6 x 10^-9 Coulombs

• -1.6 x 10^-19 Coulombs

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5