BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 2
P2 = 3 amps x 30 volts
P2 = 90 watts
P3
=
I x E3
P3
=
3 amps x 45 volts
P3
=
135 watts
PT
=
ET x I
PT
=
90 volts x 3 amps
PT
=
270 watts
or
PT = P1 + P2 + P3
PT = 45 watts + 90 watts + 135 watts
PT = 270 watts
An important fact to keep in mind when applying Ohm's law to a series
circuit is to consider whether the values used ate component values or total
values. When the information available enables the use of Ohm's law to find
total resistance, total voltage, and total current, total values must be
inserted into the formula. To find total resistance:
To find total voltage:
ET = IT x RT
To find total current:
NOTE
IT is equal to I in a series circuit.
However, the
distinction between IT and I
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