Twenty Rows' 2012 Cabernet Sauvignon was harvested in mid-to-late October from appelations across Napa Valley including Mt. Veeder, Coombsville, and Oak Knoll. The Cabernet Sauvignon fruit also includes 4% Petite Verdot, 4% Cabernet Franc, and 2% Malbec.
Zener diode is a diode which is used in its break down region. The diode is kept reverse biased in a circuit, and so it does not allow current to pass until the voltage is greater than the breakdown voltage of the zener.
The other end of the zener, the anode, is connected to ground. If the zener diode is a 5.1 volt zener, the voltage on the cathode of the zener will be very close to 5.1 volts. The voltage is going to be close (but not usually exactly) the rated zener voltage. You can sometimes get the voltage very close to its rated zener voltage by varying the value of the resistor.