The Street Articles

The only way to change the direction of rotation of a 3-phase (induction) motor is to change the incoming phase sequence. This can be done by swapping any two of the incoming three-phase lines. If you are sure you haven’t done this, either at the input or output of the starter, or at the motor terminal box, then it may be that someone else has done this upstream.  Has anyone done any work on an upstream switchboard? Has someone been changing or upgrading any wiring? Are there any other three-phase loads that are behaving differently? It may be that they have reconnected your circuit with transposed lines. So if it is important for you to find out, it is time for some detective work! Source: Ian McKenzie www.quora.com

Muhyiddin and his team has been very focussed on overcoming the COVID-19 threat and they have succeeded. As of now, we are well of the way to recovery with more than 90% of COVID-19 patients cured and our economic recovery has started. With our major trading partners also open for business, I think there is a chance that Malaysia will achieve some small economic growth this year while many other countries go into recession. Meanwhile, PH is still playing their favourite game: “who should be the next PM?” Is it Mahathir? Is it Anwar? Should Anwar be PM with Mukhris as Deputy PM? Should Mahathir be PM with Anwar as DPM for 6 months, then Anwar becomes PM with Mukhriz as DPM? They have been so absorbed with this game even while being the government that they hardly achieved anything. Under PH, GDP growth dropped, even without COVID-19. Stock market indices dropped. FDI dropped. The Ringgit dropped relative to USD. Source: Ridzwan Abdul Rahman www.quora.com

Because of an annoying thing called “power factor”. AC power is an alternating sine wave (or some other repeating wave form that hopefully resembles a sine wave to some degree or another). As a waveform, AC has both a frequency and, critically to this discussion, a phase, which in this case refers to how much the voltage component of the waveform either leads or lags the current component.  Purely resistive loads don’t affect phase: the voltage component remains in sync with the current component. However, reactive loads (those with either net capacitance or net inductance) affect phase, causing the voltage component to either lead (inductive loads) or lag (capacitive loads) the current component of the waveform.  This results in the true power being less than the product of the RMS voltage and the RMS current (which is called “apparent power”), precisely because the two components are out of phase. The difference between true power and apparent power is called “reactive power”, and th