Answer Happy

1. The graph shown in the figure shows the results of measurements of the DC current through a circuit device for various potential differences across it. Assume that all the numbers shown are accurate to two significant figures. What is the resistance of this device? I (amps) 10 8 A) 512 B) 1022 C) 0.52 D) 2Ω E) 422 6 4 2 V (volts) 5 10 2. Three resistors, each with resistance R1, are in series in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the initial circuit, which of the following is true? A) The current through R equals the current through R1. B) The voltage across R equals the voltage across R1. C) The power given off by R equals the power given off by Ri. D) R is less than R1. E) None of the above