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# hw01 - Problem 1.15 The plot in Fig P1.15 displays the...

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Problem 1.15 The plot in Fig. P1.15 displays the cumulative amount of charge q ( t ) that has entered a certain device up to time t . What is the current at (a) t = 1 s (b) t = 3 s (c) t = 6 s q ( t ) t 2 s 4 s - 4 C 4 C 0 6 s 8 s Figure P1.15: q ( t ) for Problem 1.15. Solution: (a) a = 4 2 = 2 A @ t = 1 s (slope of first segment). (b) i = 0 @ t = 3 s (slope of q ( t ) = 0 at t = 3 s). (c) i = - 8 4 = - 2 A @ t = 6 s (negative slope of third segment).

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Sections 1-4 and 1-5: Voltage, Power, and Circuit Elements Problem 1.17 For each of the eight devices in the circuit of Fig. P1.17, determine whether the device is a supplier or a recipient of power and how much power it is supplying or receiving. + _ + _ 6 V 4 A 3 A 16 V 1 A 1 A 2 A + _ 12 V + + _ _ 10 V + _ 9 V + _ 7 V 4 V + _ 8 V 1 2 3 4 5 6 7 8 Figure P1.17: Circuit for Problem 1.17. Solution: Device 1: p = vi = 16 × ( - 4 ) = - 64 W (supplier) Device 2: p = vi = 6 × 4 = 24 W (recipient) Device 3: p = vi = 10 × 1 = 10 W (recipient) Device 4: p = vi = 8 × 1 = 8 W (recipient) Device 5: p = vi = 4 × 1 = 4 W (recipient) Device 6: p = vi = 12 × 4 = 24 W (recipient) Device 7: p = vi = 9 × ( - 3 ) = - 27 W (supplier) Device 8: p = vi = 7 × 3 = 21 W (recipient)
Problem 1.18 For each of the seven devices in the circuit of Fig. P1.18, determine whether the device is a supplier or a recipient of power and how much power it is supplying or receiving.

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hw01 - Problem 1.15 The plot in Fig P1.15 displays the...

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