Try creating a "tank circuit" with a battery, switch, capacitor and inductor. Charge the capacitor, then open the switch.
Monitor the current and voltage in your tank circuit, and change the voltage of the battery, values for C and L. Calculate a resonant circuit and notice the amplitude of the sine wave (AC) you can create. Explore!
Here's how it works in a radio:
If you add headphones and a diode (rectifier) you can listen to AM radio (yes, it is really that simple):
(b) is the AM (amplitiude modulated) radio wave
(c) is the wave after the rectifier (diode) only allows the positive side to pass
(d) is the music you want to hear
MAKE SURE YOU CAN DO THE FOLLOWING WITH THE SIMULATIONS:
1. create an LC circuit, charge it, and notice the frequency of the oscillation
2. design an LC circuit with specific L and C values, predict frequency and see if this matches what you see in the simulation
3. drive your designed circuit with AC voltage, sweeping below, at and above the resonant frequency, note the amplitude of the waves in the "tank" circuit
Next: Electromagnetic Radiation (EMR)
First, some simulations: