Question

You are testing a vehicle fuel gauge float. The float pulls 40mA when the tank is 100% full and 2mA when the tank is empty. Assuming that the float's resistance scales linearly between 0% and 100% full, what current draw in milliamps should we see if we set the float to 49% full? Give your answer to the tenth of a milliamp.

Answer 1

Answer:

I=20.6mA

Explanation:

the relation between the current and the tank percentage is linear:

$\frac{40mA-2mA}{100-0} = \frac{I-2mA}{49-0}$

then:

I=49*38/100+2=20.6mA