There’s something wrong with Premier League 26/27
Cause tell me why @ChelseaFC is winning 3:0 in less than 40 mins 😡
@BHAFC you better do the needful before this match ends 😡😡😡
DAY 17/30 🤭
ELECTRICITY MISCONCEPTIONS
Heyyy Electrical students, one more for you. 🌚😂
Why are transformers rated in kVA and not kW?
You see:
500 kVA transformer
1000 kVA transformer
But why not simply say 500 kW?
The reason is that a transformer’s capacity is mainly limited by voltage and current which determine the heating in its windings and core.. rather than directly by the load’s power factor.
And since: Apparent Power = Voltage × Current
we rate transformers in VA (or kVA/MVA).
The actual useful power delivered in kW depends on the power factor of the load.
So a 500 kVA transformer doesn’t necessarily deliver 500 kW.
For example, at a power factor of 0.8
500 kVA × 0.8 = 400 kW.
So:
kVA → transformers capacity
kW → real power being used
That’s why you see transformers rated in kVA, not kW.
See you on the next one.
DAY 16/30
ELECTRICITY MISCONCEPTIONS
Heyyy Electrical Engineering students, it’s your turn. 😂
Why can’t we use a transformer with DC?
A transformer works through electromagnetic induction. For induction to occur, the magnetic field in the transformer’s core has to keep changing
With AC, the current continuously changes direction and magnitude, so it produces a changing magnetic field.
But with steady DC, after the initial switch-on, the current is essentially constant.
No continuous change in magnetic field → no continuous induced voltage in the secondary.
And there’s another problem: the primary winding can draw excessive current because there’s no normal AC inductive reactance to limit it, which can cause overheating and damage.
So the simple idea is:
AC → changing magnetic field → transformer works.
Steady DC → no changing magnetic field → transformer doesn’t work normally.
Electrical students, I know you know this one.
See you on the next one. 😌🤍🫶🏽