A AM VM Figure P1.27 Q+
Figure P1.27 shows an ammeter (AM) and voltmeter (VM) connected to measure the
current and voltage, respectively, for circuit element A. When current actually enters the + terminal
of the ammeter, the reading is positive, and when current leaves the + terminal
reading is negative. If the actual voltage polarity is positive at the + terminal of the VM, the
reading is positive; otherwise, it is negative. (Actually, for the connection shown, the ammeter
reads the sum of the current in element A and the very small current taken by the voltmeter. For
purposes of this problem, assume that the current taken by the voltmeter is negligible.) Find the
power for element A and state whether energy is being delivered to element A or taken from it if a. the ammeter reading is +2 A and the voltmeter reading is +30 V.
b. the ammeter reading is -2 A and the voltmeter reading is - 30 V.
c. the ammeter reading is -2 A and the voltmeter reading is + 30 V.
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