Ohms law:
•v(t) = i(t) R - or - V
= I
R
•p(t) = i2(t) R = v2(t)/R [+ (absorbing)]
Kirchoffs law:
•Kirchhoff’s
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
•Kirchhoff’s
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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