1-44 E_{L} = 2 20 E_{L} = 40 volts a.c. E_{R} = I_{T}R E_{R} = 2 5 E_{R} = 10 volts a.c. You can see that there is a voltage gain across the reactive components at resonance. If the frequency was such that X_{L} and XCwere equal to 1000 ohms at the resonant frequency, the reactance voltage across the inductor or capacitor would increase to 2000 volts a.c. with 10 volts a.c. applied. Be aware that potentially high voltage can exist in series-resonant circuits. SUMMARY This chapter introduced you to the principles of tuned circuits. The following is a summary of the major subjects of this chapter. THE EFFECT OF FREQUENCY on an INDUCTOR is such that an increase in frequency will cause an increase in inductive reactance. Remember that X_{L } = 2pfL; therefore, X_{L} varies directly with frequency. THE EFFECT OF FREQUENCY on a CAPACITOR is such that an increase in frequency will cause a decrease in capacitive reactance. Remember that therefore, the relationship between X_{C} and frequency is that X_{C} varies inversely with frequency.