Figure 1.25. On the left is an ideal voltage source labeled V Th. The bottom end is connected to the bottom line of the circuit. The top, positive end, connects to the left end of a resistor labeled R Th. The right end of R Th goes to the upper terminal. The lower terminal connects to the bottom line of the circuit. A voltmeter is shown connected to the terminals, one lead to each terminal. The symbol for a voltmeter is a circle with the letter V inside it. End verbal description.
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