Current. A charge in an electric field is subject to a force. Acceleration Positive charges move with the field. Negative charges move against the field. . +. Moving Charge. E. Moving water in a pipe forms a current. Steady flow at constant velocity
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A charge in an electric field is subject to a force.
Acceleration
Positive charges move with the field.
Negative charges move against the field.

+
Moving ChargeE
Moving water in a pipe forms a current.
Steady flow at constant velocity
The mass flow is the density times velocity times area.
Pressure provides the force.
Water Flowv
r
A
Moving charge forms a current.
Charge density ne instead of mass density
The charge flow is the density times velocity times area.
Defined for positive charge
Potential provides the force.
+
Charge Flowv
ne
A
In a conductors electrons are free to move.
Collide with other charges
Random motion
A potential along a wire causes a net velocity for electrons.
Negative charge moves opposite to current
Current DirectionThe current comes from the definition.
I = Dq/Dt
(3.20 x 106 C)/(200 x 103 s)
I = 16.0 mA (negative beam)
The charge of one electron is used to get the number rate.
(1.60 x 105)/(1.60 x 1019)
De/Dt = 1.00 x 1014 electrons/s
In an electron microscope a constant electron beam transports 3.20 mC of electrons in 200 ms across a vacuum.
Find the current and number of electrons per second.
Electron Beamnext