Una base de concreto con una parte de la barra de refuerzo que sobresale por la parte superior es _____.
a. un punto de control
primario
b. un punto de control de
trabajo
c. un punto de control
secundario
d. un punto de referencia
temporal
Answer: A
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A circuit that measures the internal resistance of a practical ammeter is shown in Figure P2.74, where RS = 50,000 ? , vS = 12 V, and Rp is a variable resistor that can be adjusted at will.
a. Assume that
ra ? 50,000? . Estimate the current i .
b. If the meter displays a current of 150 ?A when Rp = 15? , find the internal resistance of the meter ra .
