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M3 > 3.3 > Flashcards

3.3 Flashcards

1
Q

How does an electrical charge occur?

A

Deficiency of electrons at one point and excess of electrons at another point.

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2
Q

What is the electrical charge?

A

The sum of all electrical charges.

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3
Q

What is the symbol of charge?

A

Q.

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4
Q

What is the formula for current?

A

Current (I) = Charge (Q) / Time (t)

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5
Q

What is the unit of charge?

A

Ampere-second.

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6
Q

What are the 6 methods of generating voltage?

A 
Induction
Chemical 
Heat
Light
Crystal deformation 
Friction
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7
Q

What is induction?

A

If a coil enters the magnetic field of a magnet, an electrical voltage is generated in the coil during the movement.

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8
Q

What is electrolysis?

A

When 2 pieces of metal are immersed into an electrical conducting liquid, and a voltage is created between the 2 electrodes.

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9
Q

What is an example of an electrically conducting liquid?

A

Water with added sulphuric acid.

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10
Q

What is heating to emit electrons known as?

A

Thermionic emission.

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11
Q

On what materials can light result in a charge separation?

A

Some semi conductors (silicon or germanium)

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12
Q

How is a voltage created using pressure?

A

When a Piezo crystal is deformed using pressure

Piezoelectric effect

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13
Q

When would sparking occur between 2 bodies of different charge?

A

If the electrical field between them is concentrated at its edges.

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14
Q

What is the primary reason for static dischargers?

A

Electrical field concentrated at edges causing sparks.

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15
Q

What is conventional current flow?

A

Electric current flows for positive to negative pole.

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16
Q

What is the flow from negative to positive pole called?

A

Electron flow

Physical current flow

17
Q

What charges move in metals?

A

Only negative.

18
Q

What is 1 coulomb equal to?

A

1 ampere-second.

19
Q

What does the direction of electrons flowing through a conductor depend on?

A

Polarity of applied voltage.

20
Q

What is electrons constantly flowing in 1 direction called?

A

DC

21
Q

What is a current that periodically changes it’s flow direction?

A

AC.

22
Q

What components of tap water decompose when a DC is applied?

A

Hydrogen at negative pole.

Oxygen at positive pole.

23
Q

What is the conducting substance during electrolysis called?

A

An electrolyte.

24
Q

What gases are filament light bulbs filled with to prevent the filament from burning, oxidising or vaporising?

A

Nitrogen, argon or krypton.

25
Q

What is additionally added to other gases for halogen bulbs?

A

Halogens such as iodine or bromine.

26
Q

Under normal conditions, what charge are the major part of gas atoms?

A

Neutral.

27
Q

How does a filament create light in a bulb?

A

The electrons of a few atoms are split up by external means of energy supply. (Heat, light and radioactivity)

(Majority neutral atoms in a bulb)

28
Q

What does the current have to be limited with, in a bulb?

A

A series resistance.

A resistor in series

29
Q

What provides a visualisation of rapidly varying processes?

A

Oscillographs (recorded)

oscilloscopes (visualised)

30
Q

Why is an electron beam oscilloscope mainly used today?

A

Easy to operate
Versatile
Shock-resistant

31
Q

Who created an electron beam oscilliscope?

A

K. F. Braun (1850-1918)

Also called Braun tube.

32
Q

What is a charge equilibrium?

A

Opposite charges attracting in a vacuum.

33
Q

What application uses the benefits of an electron gun?

A

Television (television tube)

34
Q

What is voltage?

A

The difference between two electrically charged points.

35
Q

What is voltage sometimes also known as?

A

Electromotive force (EMF)

36
Q

What is the cause of current flow?

A

Voltage.

37
Q

What is Ohms Law formula?

A

Voltage = Amps x Resistance

V = I x R

M3 (6 decks)

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