1. In single-phase circuits test, consider the instantaneouspower waveforms. How is the value of the real power obtained in thesoftware? What is the significance of the instantaneous power goingnegative (consider direction of power flow and reactive power)?
2.  For each of the resistive, inductive andcapacitive loads (loads 1-3), comment on whether the currentwaveform is smoother, noisier or the same shape as the voltagewaveform. Explain the results using the following, for a resistor i= v/R, for an inductor, the current is proportional to the integralof the voltage , while in a capacitor, the current is proportionalto the derivative of the voltage.
3.
Device | Acquired Parameters | Calculated Parameters |
Vrms (V) | Irms (A) | P (W) | S (VA) | Q (VAr) | cos q | R (W) | X (W) |
1. Resistor R, (50W, D.C. Board) | 62.7 | 1.17 | 73.5 | 73.359 | j4.55 | 1.0019 | 53.69 | j3.324 |
2. Inductor L, 10A | 61.8 | 0.87 | 4 | 53.766 | 53.617 | 0.0744 | 5.285 | 70.834 |
3. Capacitor C, 18mF | 62.5 | 0.36 | -0.1 | 22.5 | -22.50 | -0.004 | -0.772 | -173.6 |
Calculate the inductance and capacitance (showing your working)corresponding to the calculated reactances in rows 2 and 3 of Table3. Compare the calculated capacitance to its nominal value.
4. Show the formulas (e.g. Z1//Z3, you donot need to show your working) you would use to calculate theimpedance for loads 4 to 6 in terms of the impedance of loads 1 to3.
