What resistance will the ohmmeter measure in the circuit shown below? a. 19 ohms b. 26 ohms c. 38 ohms d. 74 ohms

B. - 26 ohms

Explanation:

To find the total resistance of a compound circuit, find the equivalent resistance of the parallel components first. The equivalent resistance equation states that :

1R=1R1+1R2+1R3

Each light bulb has a resistance of 18 ohms, so the equivalent resistance of the parallel components is :

1R=118+118+118=318=16

So the resistance of the parallel components is 6 ohms. The next resistor is connected in series and has a resistance of 20 ohms, so the total resistance is 6+20=26 ohms.

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