Saturday, 22 December 2012

Ohm's Law and kirchoff's law

Ohms law:
v(t) = i(t) R  - or -  V = I R
p(t) = i2(t) R = v2(t)/[+ (absorbing)]
Kirchoffs law:

Kirchhoffs Current Law (KCL)

sum of all currents entering a node is zero

sum of currents entering node is equal to sum of currents leaving node

Kirchhoffs Voltage Law (KVL)
sum of voltages around any loop in a circuit is zero
Kirchoffs Current Law :

The sum of currents entering the node is zero:

Analogy: mass flow at pipe junction

KVL Polarity
A loop is any closed path through a circuit in which no node is encountered more than once
Voltage Polarity Convention
A voltage encountered + to - is positive
A voltage encountered - to + is negative

Electrical Analogies (Physical)

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