Engineering Elecrical > electro-technology > Flashcards

electro-technology Flashcards

(17 cards)

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1
Q

What would happen is a electron were to be removed?

A

the atom would be a positive

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2
Q

What would happen if a electron were to be gained?

A

the atom would be negative

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3
Q

What would surround a electric charge?

A

a electric field

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4
Q

What happens to like charges?

A

they would repel

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5
Q

What would happen to non-like charges?

A

they would attract

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6
Q

What is the formula of electric current?

A
  • I=Q/t (current=charge/time)
  • its also how to measure current
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7
Q

In a circuit what would happen to the electrons?

A

the electrons would go from the anode(negative) to the cathode(positive), which is called ‘electron flow’

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8
Q

What do we call the circuit if the current goes the other way?

A
  • conventional current
  • it doesn’t matter what way it goes both works the same
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9
Q

What is the difference between conventional and electron flow?

A
  • conventional goes from positive to negative terminal
  • electron goes from negative to positive terminal
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10
Q

If an atom has one electron or loosely-held one on the outer ring, what does that make the material?

A

it makes it a good insultor

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11
Q

If an atom has many electrons on the outer ring, what does that make the material?

A

it makes it a good insulator

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12
Q

What do conductors derive from?

A

metals

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13
Q

What do insulators derive from?

A

non-metals such as:
- plastics
- woods
- glass
are generally insulators

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14
Q

What is needed for current to flow?

A
  • a energy source (EMF)
  • a load (a lamp for example)
  • a means of transmitting (conductor)
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15
Q

What are the two types of electric flow?

A
  • DC (direct current)
  • AC (alternate current)
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16
Q

What does DC do?

Study These Flashcards
A
  • electrons keeping flowing in the same direction
    -battery and some power are power supply provide DC
17
Q

What does AC do?

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A
  • electrons flow back and forth
  • national power distribution networks provide AC
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