Electrical Force. Unit 1.3. Objectives. Explain the similarities and differences between Newton’s law of universal gravitation and Coulomb’s law. Explain how the force between two like charges and the force between two unlike charges are different. Describe how to create an electric field.
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Unit 1.3
m1m2
N m2
Fg= G
Where G = 6.67 x 1011
d2
kg2
+

charges
q1q2
N m2
FE= K
Where K = 9.0 x 109
d2
C2
Distance
SI unit = Coulomb (C)
Elementary Charge  Charge on one electron or proton = 1.6 x 1019 C
Opposite charges
Positive charge
Negative charge
Opposite plates
Like charges
Flow caused by “potential” difference
Fluid system
Electrical system
Current – Flow
A pump is a source of fluid pressure difference
A battery is a source of electrical potential difference
Electrical circuit
Control
Voltage source
Electrical Load
conductors

+

+
Battery
Battery
1.5 v
1.5 v

+
3.0 v