Coils

I a bit new to electronics, about 1.

Now I'm learning about coils, and have a few questions.

I have some coils and I know their Henry rating, I've found a lot of
information on coils.
Now I'm wondering if I took a coil let's say a 55uH applied maybe 3v,
what would be the voltage resulting. I've seen a coil used in a 3v to
9v dc-dc converter and that's why I'm wondering. I think the coil
increases the 3v to some other voltage (the circuit used a 47uH), then
an ic was used to regulate the output from the coil to 9v about.
Is there a formula that could help me here.

Or could I just build that simple circuit and using a multimeter
safely read the voltage and amps that is being produced. What I'm
worried that the voltage being produced is high and might damage my
multimeter.

.

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