[phy]electron

[S]【YU】

take right most side as reference = 0V
-ve terminal should be -2V , not 2V
B,D has the same potential as -ve terminal.
A = -2 + 1 = 1V
C = -2 - 1 = -3V
incomplete circuit, current = 0.

lkhj2525

take right most side as reference = 0V
-ve terminal should be -2V , not 2V
B,D has the same potential as -ve terminal.
A = -2 + 1 = 1V
C = -2 - 1 = -3V
incomplete circuit, current = 0.
[S]【YU】 發表於 10-2-2009 10:02

how come it is -2V?
In battery ,electrons flow from low potential to high potential.
If that is the case ,electrons will flow from +ve terminal to -ve terminal

[S]【YU】

長正短負, how come 負 potential > 正?

lkhj2525

長正短負, how come 負 potential > 正?
[S]【YU】 發表於 12-2-2009 16:36

如果-ve terminal potential<+ve terminal potential
battery外面既electron仲點會由- 去 +

Puppet

Try to get everything extremely clear:
Conventional current flows from high potential to low potential in the external circuit.
Electrons flow from low potential to high in the external circuit.
Electrons flow from high potential to low in the cell/battery.

[S]【YU】

To get thing more clear
cell/battery contains chemical that provide a relative potential between 2 terminals.
Electricity is conducted by mobile ions inside the cell when the 2 terminals are connected together by an external circuit.
principle of chemical cell = battery

Zend

To get thing more clear
cell/battery contains chemical that provide a relative potential between 2 terminals.
Electricity is conducted by mobile ions inside the cell when the 2 terminals are connected ...
[S]【YU】 發表於 14-2-2009 00:04

ＮＥ　句基本上解決左問題

lkhj2525

I get it right now.
Thank you for your explanation