- #1
fchen720
- 17
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Homework Statement
I'm in grade 11 working on a science fair project I found on this site:
http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_p014.shtml
Grade 11 physics doesn't cover much so I'm confused about why the radio is set up the
way it is...
I know that the diode prevents current from going in the opposite direction, but
what does the resistor do?
The website says that the taps at various locations is for resonance, but how does that work?
I found this paragraph on another site explaining resonance but I found it confusing.
"For electricity, a coil and capacitor make a resonant circuit. The capacitor plates get an electric charge from other parts in the radio. That charge flows through the coil. As it does, it builds up a magnetic field in the coil. When all the charge is gone from the capacitor, the magnetic field makes the electricity keep on flowing a little. This charges the capacitor plates the opposite way. As the opposite charge builds up on the capacitor plates, it finally stops the charge flow in the coil. Then the charge in the capacitor plates makes electricity flow the opposite way through the coil. That builds up a magnetic field in the opposite direction. The charge swings back and forth between the coil and capacitor at one certain frequency. That is the resonant frequency of the coil and capacitor."
If someone could explain all this or point me to some good ressources I would really appreciate it.