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ENG1030: Elec tri ca l Sys te ms

Semester 2, 2009

Tutorial 1 Questions

From Irwin/Nelms Basic Engineering

Circuit Analysis, Ninth Edition

1.1If the current in an electric conductor is 2.4 A, how

many coulombs of charge pass any point in a 30-second

interval?

1.4If a 12-V battery delivers 100 J in 5 s, find

a) the amount of charge delivered andb) the current produced.

1.14The waveform for the current flowing into a circuit

element is shown in Fig. P1.14. Calculate the amount of

charge which enters the element between

a)

0 and 3 seconds,b) 1 and 5 seconds, andc) 0 and 6 seconds.

Figure P1.14

1.16The charge flowing into the box is shown in the graph in

Fig. P1.16. Sketch the power absorbed by the box.

Figure P1.16

1.21Determine the power supplied to the elements in Fig.

P1.21.

Figure P1.21

1.27Choose ISsuch that the power absorbed by element in 2

Fig. P1.27 is 7 W.

Figure P1.27

2.1Determine the current and power dissipated in the

resistor in Fig. P2.1.

Figure P2.1

2.3Determine the voltage across the resistor in Fig. P2.3 and

the power dissipated.

Figure P2.3

2.4Given the circuit in Fig. P2.4, find the voltage across

each resistor and the power dissipated in each.

Figure P2.4

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2.7A model for a standard two D-cell flashlight is shown in

Fig. P2.7. Find the power dissipated in the lamp.

Figure P2.7

2.9Many years ago a string of Christmas tree lights was

manufactured in the form shown in Fig. P2.9a. Todaythe lights are manufactured as shown in Fig. P2.9b. Is

there a good reason for this change?

Figure P2.9

2.16Determine ILin the circuit in Fig. P2.16.

Figure P2.16

2.19Find Vbdin the circuit in Fig. P2.19.

Figure P2.19

2.30Find Vxin the circuit in Fig. P2.30.

Figure P2.30

2.35Find V1in the network in Fig. P2.35.

Figure P2.35

2.37Find the power absorbed by the dependent voltage

source in the circuit in Fig. P2.37.

Figure P2.37

2.51Find RABin the network in Fig. P2.51.

Figure P2.51

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2.58Seventeen possible equivalent resistance values may be

obtained using three resistors. Determine the seventeen

different values if you are given resistors with standard

values: 47 , 33 , and 15 .

2.60Given the network in Fig. P2.60, find the possible range

of values for the current and power dissipated by the

following resistors:

a) 390 with a tolerance of 1%b) 560 with a tolerance of 2%

Figure P2.60