Lecture 1 Summary
ECE 2100
Alyosha Molnar
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Basic units
•
Charge: q, measured in Coulombs (C)
–
1C=6x10
20
electrons
•
Energy: W, measured in Joules (J)
•
Voltage: V, measured in Volts (V)
–
V = dW/dq :
1V = 1J/C
•
Current: I, mesured in Amperes (A)
–
I = dq/dt :
1A = 1C/s
•
Power: P, measured in Watts (W)
–
P = dW/dt : 1 W = 1J/s
–
P = dW/dt = dW/dq·dq/dt = V·I
Basic laws
•
Kirchoff’s current law
(KCL)
–
For any node in a
circuit, total current into
that node sums to zero
–
Example: I
1
+I
2
+I
3
=0
•
Kirchoff’s voltage law
(KVL)
–
For any loop through a
circuit, total voltage
around that loop sums
to zero.
–
V
1
V
2
V
3
=0
I
1
I
2
I
3
+
V
1

+
V
3

+
V
2

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