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Physics > Test-Electricity and Circuits > Flashcards

Test-Electricity and Circuits Flashcards

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1
Q

What happens when two insulating materials are rubbed against each other?

A

They become electrically charged by friction. Electrons move from one to another. One is negatively charged and the other is equally positively charged.

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2
Q

Why do you need to rub an object to make it attract another object?

A

It makes the object charged. Charged objects attract neutral objects.

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3
Q

What happens when more bulbs are added to a parallel circuit?

A

Nothing. The bulbs stay the same brightness.

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4
Q

Do two negative charges repel or attract?

A

Repel

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5
Q

What type of circuit is used for home lighting?

A

A parallel circuit.

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6
Q

What do you call an object what no total charge?

A

Neutral

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7
Q

What do electrons carry in a circuit?

A

They carry energy from a cell to other components.

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8
Q

What is the symbol for resistance called, and what does it look like?

A

Ω. It is called Ohms

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9
Q

What is an electric current?

A

A flow of charged particles called electrons.

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10
Q

Does a longer wire have more or less resistance than a shorter one?

A

More

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11
Q

What is the formula for power?

A

Power=volts x current.

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12
Q

What can a short circuit do to wires?

A

Make them overheat.

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13
Q

I’m a series circuit us one bulb breaks, what happens to the rest of the circuit and why?

A

The bulbs go out. This is because the electrons can’t get through the bulb and give power to the next one.

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14
Q

Equation for resistance?

A

Potential difference divided by current.

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15
Q

What charge are electrons?

A

Negative

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16
Q

What is the resistance of a bulb if it has a current of 10 A flowing through it when a potential difference of 240 Volts is out across it?

A

24 Ohms

17
Q

What provides yeh potential difference in a circuit?

A

The cell

18
Q

What has a higher resistance, insulators or conductors?

A

Insulators

19
Q

If a material has a current if 0.00025 A and 2.4 resistance, is it like let to be an insulator or conductor?

A

Insulator

20
Q

If a material has a potential difference if 2.4 and a current of 0.15, is it likely to be an insulator or a conductor?

A

Conductior

21
Q

What does a battery rating tell you?

A

The potential difference the battery will supply.

22
Q

What is the equation for a moment?

A

Moment = force x distance

23
Q

Name the advantages and disadvantages of low energy bulbs.

A

They are low energy consuming, but expensive and not very bright.

24
Q

What direction does the north seeking pole point towards when free to rotate?

A

The north (Scotland)

25
Q

What is the region around a magnet when it has magnetic effect called?

A

The magnetic field

26
Q

Name four magnetic materials

A

Iron steel cobalt and nickel

27
Q

Do like poles repel or attract?

A

Repel

28
Q

If I put two opposite poles next to eachother, what would happen?

A

They would attract

29
Q

What is a magnetic field?

A

A region of space where magnetic materials experience forces

30
Q

Name uses of magnets.

A

They are used in Compasses, fridges, speakers, microphones and computers

31
Q

Do magnetic field lines ever cross?

A

No

32
Q

The closer the lines are what happens to the magnetic dield?

A

They field is stronger

33
Q

What is the only way you can test if something is magnetic?

A

See if they repulse from another magnet.

34
Q

What is a permanent magnet?

A

A magnet that retains its magnetism

35
Q

What is a temporary magnet?

A

They loose their magnetism when the magnetic field disappears. Otherwise they act like a permanent magnet.

36
Q

What happens to the magnetism of an electromagnet as you add coils of wire?

A

The magnetism increases.

37
Q

How can you strengthen an electro magnet?

A

Increase the voltage, increase the number of coils or insert an iron core.

38
Q

What does passing a current through a wire do?

A

It creates a magnetic field around the wire.

Physics (2 decks)

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