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IE255 (Basic EE) > Lesson 1: Intro to Nature of Electricity > Flashcards

Lesson 1: Intro to Nature of Electricity Flashcards

1
Q

What causes electricity?

A

Electrons

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2
Q

What happens to the electrons when they are in their most stable state?

A

The number of electrons is equal to the number of protons

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3
Q

Electricity is measured in?

A

Coulombs

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4
Q

1 electron is equal to?

A

-1.6022 x 10^-19 C

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5
Q

What are the two types of current flow?

A

Direct and Alternating Current

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6
Q

What type of current flow has only one direction of electricity where its path is closed?

A

Direct Current

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7
Q

What type of current flow where electrons are free to go into different direction?

A

Alternating Current

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8
Q

What are the parts of the electrical circuit variable?

A

Current, Voltage, and Resistance

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9
Q

It is the rate of flow of electricity or aka “the electricity” itself?

A

Current

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10
Q

What is the symbol and unit for current?

A

I and Ampere (A) or J/C

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11
Q

It is the work per unit charge necessary to bring/push a charge from a negatively charged plate to a positively charged plate.

A

Voltage

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12
Q

What is the symbol and unit of voltage?

A

E or V and Volt (V) or C/s

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13
Q

It is the ability of a material to limit the flow of electrons. Aka “The Blocker”

A

Resistance

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14
Q

What is the symbol and unit of resistance?

A

R and ohms (Ω ) or Js/C^2

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15
Q

What is formula of Ohm’s Law?

A

V=IR

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16
Q

What material can electricity pass through easily as it has low electrical resistance?

A

Conductor

17
Q

What substances have high electrical resistance compared to conductors?

A

Resistors

18
Q

What substances do electricity can’t pass through due to the absence of free electrons?

A

Insulators

19
Q

It is the measure of the opposition to current flow in an electrical circuit.

A

Resistance

20
Q

Who is the German physicist who studied the relationship between voltage, current, and resistance where Ohms Law is named after him?

A

George Simon Ohm (1784-1854)

21
Q

What is the formula of resistance?

A

R = pL/A

22
Q

If the length of the conductor is long, what happens to the resistance?

A

Increase

23
Q

If the length of the conductor is short, what happens to the resistance?

A

Decrease

24
Q

What is the relationship of the length of the material to resistance?

A

Directly proportional

25
Q

If the cross sectional area (A⬇️) of the material is thin, what happens to the resistance?

A

Increase

26
Q

If the cross sectional area (A⬆️) of the material is thick, what happens to the resistance?

A

Decrease

27
Q

What is the relationship of cross-sectional are to the resistance?

A

Inversely proportional

28
Q

What is the unit for resistance (R)?

A

Ohms (Ω)

29
Q

What is the unit for cross-sectional area (A)?

A

square meter

30
Q

What is the unit for lenght (L)

A

Meter

31
Q

What is the unit of resistivity coefficient (p)?

A

Ohm-meter (Ω)

32
Q

1000 Mill is equal to?

A

1 inch

33
Q

1000 CM is equal to?

A

1 MCM

34
Q

It is the measurement of how easily a current can flow through the component which is measured in Siemens (S).

A

Conductance

35
Q

What is the inverse of the resistivity and is usually denoted by the Greek letter (σ) meaning Sigma?

A

Conductivity

36
Q

What is the symbol for temperature coefficient?

A

α

37
Q

What is the effect of a positive temperature coefficient on the resistance of a conductor?

A

Resistance will increase; R⬆️= T⬆️ and/or R⬇️= T⬇️; They are directly proportional

38
Q

What is the effect of a negative temperature coefficient on the resistance of a semi-conductor or insulator?

A

They are inversely proportional. If R⬆️ = T⬇️ and If R⬇️ = T⬆️

IE255 (Basic EE) (5 decks)

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