Week 3 Assignment Practice Problem Ect-122

Practice Problems 1, 3, 8, 16, 23, 26, 30, 40, 46, 47, and 51

1. Each of the following resistor combinations is connected as shown in Figure 4.29. For each combination, calculate the total circuit resistance.

a. 1kΩ 220Ω 330Ω 1.1kΩ = 2.65kΩ

b. 10Ω 18Ω 47Ω 200Ω = 275Ω

c. 150Ω 220Ω 820Ω 51Ω = 1.24kΩ

d. 10kΩ 91kΩ 5.1kΩ 300Ω = 106.3kΩ

3. The following resistor combinations are for a circuit like the one shown in Figure 4.30. In each case, determine the unknown resistor value.

a. 1.1kΩ 330Ω 470Ω 1.9k 1.9Ω

b. 27kΩ 47kΩ 91kΩ 165kΩ

c. 33kΩ 51kΩ 6.2kΩ 44.3kΩ

d. 27Ω 39Ω 82Ω 148Ω

8. Calculate the total current for the circuit shown in Figure 4.32b.

It = 5V ÷ 12.5kΩ = 400mA

16. Calculate the value of the source voltage in Figure 4.34b.

R1 2k + 10k = 32k

500A x 32kΩ = 16V

23. Write the Kirchhoff’s loop equation for the circuit shown in Figure 4.36a, and verify that the voltages add up to 0 V.

Vs V1 V2 V3 = Vn

15V + -7V + -2V + -6V = 0V

26. Calculate the value of the current in Figure 4.37b.

R1 = 24V ÷ 220Ω = 0.11A

R2 = 24V ÷ 360Ω = 0.066 or 0.07A

R3 = 24V ÷ 470Ω = 0.05A

R4 = 24V ÷ 3A = 8Ω

30. For the circuit shown in Figure 4.38b, calculate the voltage from point A to ground.

0.61 V2 + 7.3 V3 = 7.91 V or (9V) 195/222 = 7.91

40. Calculate the component voltage and power values for the circuit shown in Figure 4.41b , along with the circuit values of R T , I T and P T .

VR1 = 2.5V VR2 = 13.2V

VR3 = 0.3V PR1 = 623µW

PR2 = 3.22mW

PR3 = 78µW Rt = 75.5 kΩ

It = 16V / 75.5 kΩ = 212 µA

Pt = 16V x 212 µA = 3.392 mW

46. A 15 V source is connected to a 910 Ω resistor with a 5% tolerance. Calculate the maximum value of circuit current.

16 mA

47. Convert the following values to engineering notation form without using your calculator. [Introduction]

a. 0.000047 F = 47µF

b. 12,560 Ω = 12.56 kΩ

c. 0.000000010 m = 10 nm

d. 3,500,000,000 Hz = 3.5 GHz

51. Determine the value of V S 3 for the circuit in Figure 4.45...