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Electricity > Electricity > Flashcards

Electricity Flashcards

1
Q

Describe how an object can be charged like a balloon

A

Objects can have positive, negative and neutral charges. If they have more electrons they are negatively charged, a charged atom is called an ion. When u rub a balloon against ur head it picks up extra electrons and now I negatively charged!

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2
Q

Laws of attraction and repulsion

A

Like objects repel and opposites attract

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3
Q

Describe how lightning works

A

A storm cloud is negatively charged at the bottom and the ground has a positive charged. The 2 are attracted to each other and form a chain of ions connecting them both.

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4
Q

How does a lightning rod control lightning?

A

Lightning rods help to control lightning by conducting the electrons to the ground through a tall positively charged metal rod.

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5
Q

3 ways static electricity is useful?

A
  1. Electrostatic precipitators can control air pollution by filtering fine particles from gas.
  2. Electrostatic painting uses charged particles to give a smooth even coat of paint.
  3. Pocket dosimeters use charged particles to detect radiation.
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6
Q

Insulator

A

A material that holds electrons tightly

and dosnt allow them to move easily

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7
Q

Conductor

A

A material that holds electrons loosely and allows them to move around easily

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8
Q

Current electricity

A

The flow of electrons through a conductor

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9
Q

What is a cell and what is it made out of

A

A cell is a device that generates electricity through chemicals. contains two terminals a cathode (+) and a anode (-)

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10
Q

What is an ammeter

A

A device for measuring and regulating the flow of electrons

Measures current

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11
Q

What units describe current

A

I current in amperes
Q coulombs of charge c
T time in seconds

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12
Q

Potential deference

A

The difference of potential energy per coulomb of charge at one point in a circuit compare to another

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13
Q

Units of potential difference

A

V potential difference in volts
E energy in joules
Q coulombs in c

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14
Q

Charge of electrons

A

6.25x10-18

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15
Q

Draw triangle for current

A

Q

I. T

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16
Q

Draw triangle for potential difference

A

E

V. Q

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17
Q

Resistance

A

The opposition that a substance offers to the flow of electrons, and converts electrical energy into other forms of energy.

18
Q

Units of resistance

A

R. Resistance in ohms
V. Potential difference in volts
I current in amperes

19
Q

Triangle for resistance

A

V

R. I

20
Q

Power

A

The rate of doing work or energy

21
Q

Power units

A

P power in watts
E energy in joules
T time in seconds

P power in watts
I current in amperes
V potential difference in volts

22
Q

Triangles for power

A

E. P

P. T. I. V

23
Q

Advantages to series circuits

A

Easy to assemble
Cheaper
All areas get equal current

24
Q

Disadvantages to series circuits

A

1 bulb goes out all got out

Voltage is split

25
Q

Advantages to parallel circuit

A

voltage is equal (no dimmed lights)

If one current path stops other continue

26
Q

Disadvantages of parallel circuits

A

Current is split

More wiring

27
Q

What is global warming and how is it caused

A

The earths temperatures rising, carbon dioxide traps heat in the atmosphere not allowing it to escape, burning coal oil and fossil files releases more carbon dioxide

28
Q

Non renewable sources

A

Can not be reused and are being use up faster then they are being produced
Ex coal oil gas uranium

29
Q

Renewable resources

A

Can be replaced and are being produced faster then the usage

Ex tides
Winds
Solar

30
Q

Nuclear fission

A

Splitting of uranium atoms and releasing 2-3 neutrons and releasing lots of energy

31
Q

Nuclear fusion

A

2 atoms combining and releasing a lot of energy

32
Q

A charged particle is called an….?

A

Ion

33
Q

Electrostatics

A

Branch of physics that study’s electric charges and fields

34
Q

What’s a circuit?

A

A path over which an electric current flows.

35
Q

What’s a switch?

A

A device for turning electrical current on and off by closing an opening the circuit.

36
Q

What’s a battery.

A

A combination of electric cells that produce a potential difference.

37
Q

What’s a resistor?

A

A component that resists the passage of current, converting electric energy into other energy.
Ex a light bulb turns electric energy into light energy

38
Q

What are the rules for current and voltage in a series circuit?

A

Current is equal at each resistor

Voltage splits (is shared) between resistors

39
Q

What are the rules for current and voltage in a parallel circuit?

A

Voltage is equal at each resistor

Current is split (shared) between resistors

40
Q

What are some sources of energy?

A 
Tides
Wind
Fossil fuels 
Oil
Coal
Atom splitting
41
Q

What are the top 3 sources of energy in Canada?

A

Hydro (water)
Thermoelectric (heat)
Thermonuclear (uranium atoms)

Electricity (1 decks)

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