电工与电子技术英文习题.doc

电工与电子技术英文习题1.2 4 Determine the power being absorbed by each of the circuit shown Fig 1.26. Fig 1.261.3 8 In the simple circuit shown in Fig 1.30, the same current flows through each element. If Vx=1V and VR=9V, compute: (a) the power absorbed by element A (b) the power supplied by each of the two sources (c) Does the total power supplied=the total power absorbed? Is your finding reasonable? Why (or why not)? Fig 1.30 Fig 1.311.3 9 For the circuit in Fig 1.31, if u2=1000i2 and i2=5mA, determine us。1.4 12 Let R=1200 for the resistor shown in Fig1.32. Find the power being absorbed by R at t=0.1s if : (a) (b) (c) ; Fig1.32 Fig1.331.4 15 In the circuit in Fig1.33, the same current must flow through all three components as a result of conservation laws. Using the fact that the total power supplied=total power absorbed, show that the voltage across resistor R2 is given by:2.3 5 Find ix in each of the circuits in Fig 2.30. (a) (b) (c) Fig 2.302.4 12 Use Ohms and Kirchhoffs law on the circuit of Fig 2.36 to find (a) ; (b) ; (c) ; (d) the power provided by the dependent source. Fig 2.36 Fig 2.412.5 18 Find i1 in the circuit of Fig 2.41 if the dependent voltage source is labeled: (a) 2v2 ; (b) 1.5v3 ; (c) -15 i1 .2.7 32 (a) Using series combination of sources, compute i for circuits in Fig 2.53. Fig 2.53 Fig 2.602.8 40 (a) Find Req for each of the resistive network shown in Fig 2.60.2.8 52 Use current and voltage division to help obtain an expression for v5 in Fig 2.71. Fig 2.714.3 16 Use source transformation and resistance combination to simplify both of the networks of Fig 4.43 until only two elements remain to the left of terminals a and b. (a) (b)Fig 4.434.3 23 Use repeated source transformation to determine the current Ix in the circuit of Fig 4.50. Fig 4.504.4 34 (a) Find the Thevenin equivalent of the network shown in Fig 4.59. (b) What power would be delivered to a load of 100 at a and b? Fig 4.59 Fig 4.604.4 35 Find the Norton equivalent of the network shown in Fig 4.60.5.2 6 The current through a capacitor is given by .If the energy stored at t=200ms is , what is the value of the capacitance? 5.3 10 With reference to Fig 5.22: (a) sketch vL as a function of time, 0t60ms; (b) find the value of time at which the inductor is absorbing a maximum power; (c) find the value of time at which it is supplying a maximum power; and (d) find the energy stored in the inductor at t=40ms. Fig 5.22 Fig 6.286.2 2 The switch in Fig 6.28 opens at t=0 after having been closed for time immemorial. Find iL and ix at (a) ; (b) ; (c) t=0.3ms.6.4 15 Determine and for the circuit of Fig 6.35 and sketch both curves on the same time axis, -0.1st0. (e) Find i(t). (f) Find and from i(t) and the initial values. (g) Show that the stored energy at t= plus the total energy dissipated in the 20-k resistor is equal to the energy stored in the capacitors at t=0. Fig 6.527.4 11 Perform the indicated operation(s), and express the answer as a single complex number in rectangular form: 7.7 19 If a voltage source is connected to terminals a and b in Fig 7.41 (+reference at the top