Basic DC Theory
BASIC DC CIRCUIT CALCULATIONS
Figure 19 Voltage Drops in a Series Circuit
Ohm’s law may now be applied to the entire series circuit or to individual component parts of
the circuit. When used on individual component parts, the voltage across that part is equal to
the current times the resistance of that part. For the circuit shown in Figure 20, the voltage can
be determined as shown below.
V1 = IR1
V2 = IR2
V3 = IR3
VT = V1 + V2 + V3
VT = 10 volts + 24 volts + 36 volts
VT = 70 volts
Rev. 0
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