BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 2
Notice that the amount of current is the same as before.
however, is negative.
The negative polarity simply indicates the wrong
direction of current was assumed.
Should it be necessary to use this
current in further calculations on the circuit using Kirchhoff's law, the
negative polarity should be retained in the calculations.
(2) Series Aiding and Opposing Sources.
In many practical
applications, a circuit may contain more than one source of EMF. Sources of
EMF that cause current to flow in the same direction are considered to be
series aiding and the voltages are added. Sources of EMF that would tend to
force current in opposite directions are said to be series opposing, and the
effective source of voltage is the difference between the opposing
AIDING AND OPPOSING SOURCES.