A 74.1-Ω resistor is connected in parallel with a 128.0-Ω resistor. This parallel group is connected in series with a 22.0-Ω resistor. The total combination is connected across a 20.5-V battery. Find (a) the current and (b) the power dissipated in the 128.0-Ω resistor.
A 74.1-Ω resistor is connected in parallel with a 128.0-Ω resistor. This parallel group is connected in series with a 22.0-Ω resistor. The total combination is connected across a 20.5-V battery. Find (a) the current and (b) the power dissipated in the 128.0-Ω resistor.
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Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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Question
A 74.1-Ω resistor is connected in parallel with a 128.0-Ω resistor. This parallel group is connected in series with a 22.0-Ω resistor. The total combination is connected across a 20.5-V battery. Find (a) the current and (b) the power dissipated in the 128.0-Ω resistor.
Expert Solution
Step 1
when 2 resistors are connected in parallel equivalent of two resistors is given by
Req = R1×R2/(R1+R2)
when two are connected in series eq is given by Req = R1 + R2
power in resistor is given by P = I2 R
where ,
I = current in resistor
R = resistance of resistor
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