Electricity - Basic Properties

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  • Created by: Mal
  • Created on: 19-03-14 13:55
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Pages in this set

Page 1

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Introduction
Electricity is NOT a source of
energy. It is just a convenient way
of TRANSFERRING energy from
one place to another with relatively
little energy loss.

Page 2

Preview of page 2
Introduction
TAP HERE
...for a video on Charge and
Current.

Page 3

Preview of page 3
Introduction
Electric current is a measure of the
flow of free electrons. Electric
Potential (a.k.a. Voltage) is a
measure of how closely those
electrons are packed together.

Page 4

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Free Electrons
The outer electrons orbiting the
atoms of metals can be forced out of
orbit and made to drift through the
atomic lattice. If a very large
number of such electrons all move
at once then this forms an electric
current.

Page 5

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Electric Current
Electric current is the rate of flow of
charge I = Q/t 1 Ampere (A) is 1
Coulomb (C) per second (s) 1 A = 1
Cs-1

Page 6

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The Coulomb
1 Coulomb is the amount of
electrical charge transferred when a
constant current of 1 Amp flows for
1 second. Q = I x t

Page 7

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Electric Current
Since each electron has a charge of
1.6x10-19 coulombs (C) then a
current of 1 Amp is also a flow of
6.25x1018 electrons passing a fixed
point every second.

Page 8

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Electric Current
The direction of electric current
flow is defined in terms of the flow
of positive charges ­ this is
"conventional current". Electrons
flow in the opposite direction.

Page 9

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Electric Current
A wire has length L, cross-sectional
area A and contains n
charge-carriers per unit volume and
each has a charge q

Page 10

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Electric Current
So the total charge, Q contained in
this section of wire is nq x volume.
Q=nALq.

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Pages in this set

Page 1

Preview of page 1
Introduction
Electricity is NOT a source of
energy. It is just a convenient way
of TRANSFERRING energy from
one place to another with relatively
little energy loss.

Page 2

Preview of page 2
Introduction
TAP HERE
...for a video on Charge and
Current.

Page 3

Preview of page 3
Introduction
Electric current is a measure of the
flow of free electrons. Electric
Potential (a.k.a. Voltage) is a
measure of how closely those
electrons are packed together.

Page 4

Preview of page 4
Free Electrons
The outer electrons orbiting the
atoms of metals can be forced out of
orbit and made to drift through the
atomic lattice. If a very large
number of such electrons all move
at once then this forms an electric
current.

Page 5

Preview of page 5
Electric Current
Electric current is the rate of flow of
charge I = Q/t 1 Ampere (A) is 1
Coulomb (C) per second (s) 1 A = 1
Cs-1

Page 6

Preview of page 6
The Coulomb
1 Coulomb is the amount of
electrical charge transferred when a
constant current of 1 Amp flows for
1 second. Q = I x t

Page 7

Preview of page 7
Electric Current
Since each electron has a charge of
1.6x10-19 coulombs (C) then a
current of 1 Amp is also a flow of
6.25x1018 electrons passing a fixed
point every second.

Page 8

Preview of page 8
Electric Current
The direction of electric current
flow is defined in terms of the flow
of positive charges ­ this is
"conventional current". Electrons
flow in the opposite direction.

Page 9

Preview of page 9
Electric Current
A wire has length L, cross-sectional
area A and contains n
charge-carriers per unit volume and
each has a charge q

Page 10

Preview of page 10
Electric Current
So the total charge, Q contained in
this section of wire is nq x volume.
Q=nALq.

Comments

No comments have yet been made