Restless Electrons 4.1.2 Transfer of Charge Good Conductor/ Poor Insulator Allows electrons to flow...
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Transcript of Restless Electrons 4.1.2 Transfer of Charge Good Conductor/ Poor Insulator Allows electrons to flow...
Good Conductor/Poor Insulator
Allows electrons to flow freely.
Good Insulator/Poor Conductor
Strongly resists flow of electrons.
Conductive Properties of Materials
HIGH CONDUCTIVITY LOW CONDUCTIVITY LOW RESISTIVITY HIGH RESISTIVITY
Charging by Friction• Rub two insulators together
• ELECTRONS move from one to the other• One object becomes + the other -
RULE #1 – ONLY ELECTRONS MOVE
- - - - -
-
-
-
-
Grounding Symbol:
Grounding
• Since the Earth is very large it can neutralize:• negative objects by
ABSORBING electrons• positive objects by
RELEASING electrons
++++
RULE #2 – GROUNDING MAKES ANOBJECT NEUTRAL
2
+ -
1
+ - - +
3
+ - - +
- - - - - - - - --
-
-
-
--
-
-
-
-
-
--
--+
Induction – Negative Rod
ANIMATENEXT
RULE #3 – ELECTRONS FLOW TOWARD LESS NEGATIVE/MORE POSTIVE AREAS
Induction – movementof charge without
contact
3
+ -- +
2
- +
1
+ -- +
+ + + + + + + -
-
-
-
-
--
-
-
-
-
-
--
-
-
Induction – Positive Rod
ANIMATENEXT
RULE #4 – INDUCTION = POLARIZATION
Induction – movementof charge without
contact
3
-
2
-
e-1
+ -- +
---
--
-- -
Conduction – Negative Rod
- - - - - - - - - - -
ANIMATENEXT
Conduction – movementof charge with
contact
RULE #5 – CHARGING BY CONDUCTION GIVES SAME
CHARGE
3
+
2
+
e--
-
-
-
-
-
-
-
Conduction – Positive Rod
+ + + + + + + + +
ANIMATENEXT
Conduction – movementof charge with
contact
RULE #5 – CHARGING BY CONDUCTION GIVES SAME
CHARGE1
+ -- +
2-
--
e- -
--
3-
--
ANIMATENEXT
-
- - - - - - - - - - - -e -
e -
Charging by Conduction – Negative Rod
RULE #5
4
e-
51
52-
--
e- +
++
3+
++
14
e-
Charging by Conduction – Positive Rod
ANIMATENEXT
-
+ + + + + + + + + e -
e -
RULE #5
6
e-
213+ e-
+ +
4+
++
Charging by Induction – Negative Rod
ANIMATENEXT
-
- - - - - - - - - - - -
e -e -
RULE #6
5+
++
6
e-
213- e-
- -
4-
--
Charging by Induction – Positive Rod
ANIMATENEXT
-
+ + + + + + + + +
e -e -
RULE #6
5-
--
RULE #6 – CHARGING BY INDUCTION GIVES OPPOSITE
CHARGE