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grade 9 science > Charging > Flashcards

Charging Flashcards

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0
Q

Between what particles would an electric force of repulsion occur?

A

Proton to proton because like charges repel

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1
Q

What kind of charging will leave the two items with an opposite charge?

A

Friction

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2
Q

The smallest positive charged particle is?

A

Proton

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3
Q

What unit is power measured in?

A

Watts

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4
Q

What unit is charge measured in?

A

Coulombs

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5
Q

Amperes is used to measure…?

A

Current

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6
Q

Circuit breakers are switches that…?

A

Turn off if too much current flows through the circuit breaker

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7
Q

Ohms is the unit for..?

A

Resistance

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8
Q

What is currents symbol?

A

I

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9
Q

Induction is the charging method that causes you to receive a shock after walking across a carpet.. True or false?

A

False! Friction is the charging method!

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10
Q

If an object is grounded it will gain electrons… True or false?

A

False it will lose electrons

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11
Q

A conductor easily carries protons from one place to another.. True or false?

A

False! A conductor easily carries ELECTRONS

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12
Q

Three ways of charging and object

A

Induction
Friction
Contact

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13
Q

What factors affect the amount of static charge that is transferred when you rub two different substances together?

A

Moisture In the air

The materials you rub together

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14
Q

The differences between insulators and conductors?

A

An electrical insulator is a substance in which electrons cannot move freely from one atom to another
An conductor is a substance in which electrons CAN move freely from one atom to another

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15
Q

How does a lighting rod mounted on the roof protect your house?

A

It grounds the house

16
Q

Ways to discharge a charged object.

A

Leave it for long enough
Ground it
Shine light on it

17
Q

The difference between static electricity and current electricity?

A

Static electricity is generated by friction, or sudden contact – for instance, rubbing two materials against each other
Current electricity, on the other hand, is a phenomenon of moving electrons in a particular path, or direction, such as a stream of them flowing through conducting materials.

18
Q

The difference between a primary cell and a secondary cell?

A

A primary cell can only last so long…

A secondary cell can be recharged to be used over and over again

19
Q

What is a short circuit? Why is it dangerous?

A

A short circuit in an electrical circuit that allows a current along a different path from the one intended A short circuit is dangerous because the magnitude of electric current can be very large and the release of energy very dramatic

20
Q

Why are houses wired in parallel?

A

So if one light burns out all the lights in the house wouldn’t go out as well! Also so it doesn’t take forever to find which light went out

21
Q

List one advantage and one disadvantage of circuit breakers over fuses.

A

Advantage: when a fuse goes it’s done but when a circuit breaker goes all you have to do is flip it.
Disadvantage: fuses are cheaper

22
Q

Why is it dangerous to help someone experiencing electric shock?

A

Because the shock could travel through their body to yours!

23
Q

Contact is a way of charging objects?

A

That gives the same charge as the original charged object

24
Q

Between which particles would an electric force of attraction occur?

A

Electron to proton

25
Q

State the law of electric charge

A

Like charges repel

Opposite charges attract

26
Q

Definition of current?

A

How many electrons go through a wire in a certain time

27
Q

Definition of a parallel circuit?

A

Electrical circuit where load is connected to energy source by own separate paths

28
Q

Definition of discharge

A

To neutralize or remove all electric charges

29
Q

You bring a charged ballon near some confetti. Some of the confetti will jump onto the ballon the quickly jump off again. Why?

A

They attract because they have opposite charges but when they touch they share the same charge and that’s why the confetti falls off

grade 9 science (4 decks)

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