Figure 4.5. A rectangular block is labeled 4 terminal network. There are two terminals on the left and two more on the right. An arrow next to the upper left terminal indicates a current flowing into the block. This current is designated as I 1. The voltage between the two left hand terminals is labeled V 1. Another arrow next to the upper right terminal indicates a current flowing out of the block. This current is labeled I 2. The voltage between the two right hand terminals is identified as V 2. End verbal description.
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