BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 2
For R2:
P2 = I2 x R1
P = (4 amps)2 x 10 Ohms
P2 = 160 watts
For R3:
P3 = I2 x R3
P = (4 amps)2 x 15 Ohms
P3 = 240 watts
To obtain total power:
PT = P1 + P2 + P3
PT = 80 watts + 160 watts + 240 watts
PT = 480 watts
To check the
answer,
the
total
power
delivered
by
the
source
can
be
calculated:
Psource = Tsource x Esource
Psource = 4 amps x 120 volts
Psource = 480 watts
The total power is equal to the sum of the power used by the individual
resistors.
b. Summary of Characteristics.
The important factors governing the
operation of a series circuit are as listed below. These factors have been
set up as a group of rules so that they may be easily studied. These rules
must be completely understood before the study of more advanced circuit
theory is undertaken.
(1) Rules for Series DC Circuits.
(a) The same current flows through each part of a series circuit.
(b) The total resistance of a series circuit is equal to the sum
of the individual resistances.
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