4.1 - Electricity - Charge and Current Flashcards

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1
Q

What is current defined as

A

Rate of flow of charge

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2
Q

What is the SI base unit for current

A

Amperes

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3
Q

What is 1 coulomb defined as

A

The amount charge in a time of 1 second when the current is 1 ampere

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4
Q

What is the elementary charge

A

1.6x10^-19

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5
Q

What is the equation for number of electrons

A

Q = Ne

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6
Q

What is current in metals carried by

A

electrons

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7
Q

What are liquids that can conduct a charge called

A

Electrolytes

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8
Q

What are electrolytes

A

Ionic solutions (contains both positive and negative ions)

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9
Q

What is conventional current

A

Rate of flow of charge from the positive to the negative terminal

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10
Q

In metals what is electron flow

A

Where the flow is in the opposite direction to conventional current (from negative to positive terminal)

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11
Q

What is Kirchhoff’s first law

A

The total current entering a junction or a node is equal to the charge leaving the node as no charge is lost. (conservation of charge)

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12
Q

Can charge be created or destroyed

A

No

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13
Q

What is the mean drift velocity equation ?

A

I = nAve / current = cross sectional area X number of electrons X drift velocity X electron charge

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14
Q

What is the charge of a proton

A

1.6x10^-19

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15
Q

What is the charge of an electron

A

-1.6x10^-19

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16
Q

What is mean drift velocity defined as

A

The average velocity of the electrons as they travel down the wire ,colliding with positive metal ions

17
Q

Do conductors have a high or low number density of free electrons per unit volume

A

They usually have very high number densities

18
Q

What carries charge in electrolytes

A

Ions

19
Q

Order conductors, semiconductors and insulators in order from highest ‘n’

A

Conductors
Semiconductors
Insulators