1. The problem statement, all variables and given/known data Given a series RLC circuit, with one R, one L, and one C element, and an AC voltage source with variable frequency, find the resonant frequency experimentally given an ammeter and a voltmeter. 2. Relevant equations The current in the circuit when the circuit is in resonance is maximum. The imaginary part of the total impedance/admittance of the circuit is zero. 3. The attempt at a solution I would just measure the effective current using the ammeter for different frequencies and then note at which frequency is the maximum, but I am worried about the given voltmeter - any ideas on where to apply it?