At the end of this lesson you should be able to:

• Distinguish between resistance, capacitive reactance, inductive reactance and impedance in an LR or LRC circuit. Calculate the reactance of a capacitor and/or inductor which is connected to a source of known frequency.
• Detrmine the rms current and power dissipated in an LRC circuit. Determine the voltage drop across each circuit element and the resonant frequency of the circuit.
• Describe how electromagnetic waves are produced.
• Calculate the velocity of electromagnetic waves in a vacuum if both the permittivity and permeability of free space are given.
• State the names given to the different segments of the lectromagnetic spectrum.
• State the equatuion that relates the speed of a wave to its frequency and wavelength.