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Lecture 1 Summary

Lecture 1 Summary - – V B-V A = 0 Æ V A = V B(loop 1 –...

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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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