ET 201- Electrical Circuit EOC1END OF CHAPTER 1

1. From the given waveform explain and determine the following parameters:

a. Period b. Frequency c. Peak Value d. Peak-to-Peak Value e. RMS Value (also called effective value) f. Average Value

(12 marks, CLO1, 1.3.2)

2. The current in an a.c circuit at any time t seconds is given by :

Determine:

a. the peak value, the periodic time, the frequency and phase angle relative to

b. the value of current when

c. the value of current when

(8 marks, CLO2, 1.3)

3. Calculate the following complex number by using mathematical operation

a. (7+j5) + (8+j6) / 25<−27ºb. (43 – j23)(89 – j4) – (40+j2)(6<8º)c. (265 <73º)(2 <−37º)+(9<22º) / (5-j4)

(6 marks, CLO2, 2.5.1)

4. Express phasor quantity A and B in Figure 1 as rectangular form and polar form.

1kΩ 0.1 H 1.2 μF10 Vrms ,1 khz

1 KΩ 150 mH 0.3 μF

12 Vrms, 1.2 khz

ET 201- Electrical Circuit EOC1

(4 marks, CLO1, 2.3.1)

5. a. Sketch the phasor diagram and sinusoidal waveform to show the relationship between

voltage and current in purely resistive, capacitive and inductive circuit.

b. State the relationship between R, XL and XC with respect to frequency

(10 marks, CLO1, 3.1)

6. Calculate IT , IR , IL , IC ,VT , VR , VL , VC , XC and XL

a.

Figure 2b.

Figure 3(20 marks, CLO2, 3.4)

Figure 1

ET 201- Electrical Circuit EOC1