(Continued)
ERB = RB x It
= 125 x 2 a
ERB = 250 v
Therefore,
ER3 = 250 v
ER4 = 250 v
When the voltage across a resistor is known, the
current through the resistor is determined by
using Ohm's law. The voltage across R4 was
calculated to be 250 v. To compute the current
through R4, insert the two known values into the
equation for Ohm's law.
IR4 = ER4
R4
= 250 V
250
IR4
1a
Note that the current through R4 is less than It.
Since current divides between R3 and R4, each
individual current must be less than It. In fact,
the sum of IR3 plus IR4 is equal to It.
2-27
IT0334
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