2.7 and 2.8

hoff's current and voltage laws 2.7 ' a) The terminal voltage and terminal current were measured on the device shown. The values of v, and i, are provided in the table. Using these values, create the straight line plot of v, versus i,. Compute the equation of the line and use the equation to construct a circuit model for the device using an ideal voltage source and a resistor. b) Use the model constructed in (a) to predict the power that the device will deliver to a 25 0 resistor. Answer: (a) A 25 V source in series with a 100 0 resistor; (b) 1 W. v. (V ) i, (A) 25 0 Device 15 0.1 5 0.2 0 0.25 (a) (b) 2.8 Repeat Assessment Problem 2.7 but use the equation of the graphed line to construct a cir- cuit model containing an ideal current source and a resistor. Answer: (a) A 0.25 A current source connected (b) 1 W. between the terminals of a 100 1 resistor