In junction diodes the connecting wires play no role in diode action. Therefore, junction diodes don't have cat whiskers in the same sense point-contact diodes do. A coil stores energy in its magnetic field. Combined with capacitors, coils form resonant circuits. Taps on coils assist in impedance matching.
Condenser is an older word for capacitor.
Anything that electricity easily flows through. Conductors include wire, capacitor plates, bolts, screws, iron pipes and damp salty ground. A piece of semiconductor material. Modern crystals, such germanium, silicon, gallium arsinide and even diamond and some plastics are produced by carefully-controlled laboratory or industrial processes. For a natural crystal to show diode action, it must be mechanically clamped or set in a small cup of solder.