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EE 302 - HW 1 Solutions

# EE 302 - HW 1 Solutions - × 6 6 × 12 3V 28 28 × 2 3 ×...

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EE302 Homework #1 Chapter 1, Problem 6. The charge entering a certain element is shown in Fig. 1.23. Find the current at: (a) t = 1 ms (b) t = 6 ms (c) t = 10 ms Chapter 1, Solution 6. (a) At t = 1ms, = = = 2 80 dt dq i 40 A (b) At t = 6ms, = = dt dq i 0 A (c) At t = 10ms, = = = 4 80 dt dq i –20 A

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Chapter 1, Problem 11. A rechargeable flashlight battery is capable of delivering 85 mA for about 12 h. How much charge can it release at that rate? If its terminals voltage is 1.2 V, how much energy can the battery deliver? Chapter 1, Solution 11. q= it = 85 x10 -3 x 12 x 60 x 60 = 3,672 C E = pt = ivt = qv = 3672 x1.2 = 4406.4 J
Chapter 1, Problem 18. Find the power absorbed by each of the elements in Fig. 1.29. Chapter 1, Solution 18. p 1 = 30(-10) = -300 W p 2 = 10(10) = 100 W p 3 = 20(14) = 280 W p 4 = 8(-4) = -32 W p 5 = 12(-4) = -48 W

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Chapter 1, Problem 20. Find V 0 in the circuit of Fig. 1.31. Chapter 1, Solution 20. Since Σ p = 0 -30

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Unformatted text preview: × 6 + 6 × 12 + 3V + 28 + 28 × 2 - 3 × 10 = 0 72 + 84 + 3V = 210 or 3V = 54 V = 18 V Chapter 1, Problem 28. A 30-W incandescent lamp is connected to a 120-V source and is left burning continuously in an otherwise dark staircase. Determine: (a) the current through the lamp, (b) the cost of operating the light for one non-leap year if electricity costs 12 cents per kWh. Chapter 1, Solution 28. A 0.25 = = = 120 30 (a) V P i \$31.54 ( = × = = × × = = 262.8 \$0.12 Cost kWh 262.8 Wh 24 365 30 pt W b) Chapter 1, Problem 36. A battery may be rated in ampere-hours (Ah). A lead-acid battery is rated at 160 Ah. (a) What is the maximum current it can supply for 40 h? (b) How many days will it last if it is discharged at 1 mA? Chapter 1, Solution 36. days 6,667 , ( A 4 = = = = ⋅ = day / 24h h 000 160 0.001A 160Ah t b) 40 h A 160 i (a)...
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EE 302 - HW 1 Solutions - × 6 6 × 12 3V 28 28 × 2 3 ×...

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