Figure 0.4, Thevenin's Equivalent Circuit of Figure 0.2. On the left is a circle indicating an ideal voltage source. It is labeled Vth = 12 volts. A plus sign near the top terminal informs us that it is a source of DC. The negative terminal connects to the common line. The positive terminal connects to one end of a resistor labeled Rth = 1250 ohms. The other end of Rth connects to the positive output terminal. The negative output terminal connects to the common line. This completes the verbal description.
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