Physics 2b Flashcards

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0
Q

What happens when certain insulating materials are rubbed together?

A

Negatively charged electrons will be taken off one and added to the other

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1
Q

What is Static electricity?

A

Charges that are not free to move

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2
Q

Give an example of an insulating material

A

A polythene rod

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3
Q

What does an acetate rod do differently to a polythene rod?

A

Acetate gives electrons and polythene takes them

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4
Q

Does the acetate rod become positively or negatively charged? Why does it do this?

A

Acetate rod becomes positive because the rod loses the negative electrons

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5
Q

True or false - Positive charges move

A

False - only negatives move

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6
Q

What do opposite charges do ?

A

Attract

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7
Q

Why do the acetate and polythene rods manage to make you hair stand on end ?

A

They attract the opposite charge

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8
Q

What is current ?

A

The flow of electric charge round a circuit

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9
Q

What is the sign for current ?

A

A

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10
Q

What is potential difference ?

A

The driving force which carries the current around a circuit

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11
Q

What is the sign of potential difference ?

A

V

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12
Q

What is resistance ?

A

Anything in the circuit which slows the flow down

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13
Q

What is the sign for resistance ?

A

Omega

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