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1. The problem statement, all variables and given/known data

An automobile gasoline gauge is shown schematically in Figure 27-61. The indicator (on the dashboard) has a resistance of 10 . The tank unit is a float connected to a variable resistor whose resistance varies linearly with the volume of gasoline. The resistance is 200 when the tank is empty and 30 when the tank is full.

*Find the current when the tank is half-full*

2. Relevant equations

V=IR

3. The attempt at a solution

the current when the tank is empty is 12=I*200. so i multiplied that by two to get the answer but it was incorrect. i also tried to plug 15 into the equation since it's half of thirty but that too was wrong

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# Homework Help: Circuit indicator problem

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