In addition to Ohm's law, which was introduced in Chapter 3, these
laws can be used to determine currents and voltage drops in d.c.
networks.
(a) At any junction of resistances the sum of the currents flowing
towards the junction is equal to the sum of currents flowing from it.
This means that the algebraic sum of currents meeting at any point
in a network is zero.
h R
3
Figure
4.1
Consider Figure 4.1:
Current flowing towards A = /
Currents flowing away from A = I\ + I
2
+ I
3
Therefore
/ = /, + /
2
+ h
or
/ - /, - /
2
- h = 0
The law shows that there cannot be an accumulation of charge at
any point in a circuit ...
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