Q1) Is it possible that a machine burns out due to voltage drop at its
terminal? I mean that the supply voltage is not equal to the rated
Q2) Is it true that for a constant KVA load current increases as the
voltage decreases? What is a constant KVA load? (Example)
We know that current and voltage are directly related. As voltage
increases current increases as well.
Can any one explain?
#1 Yes it's possible to burn out certain devices with low line voltage. Most
however would NOT burn out, may trip a breaker or just run poorly. It all
depends on what the device is and its particular characteristics.
#2 If it is truly constant KVA, and not constant current or constant voltage
or some other regulation, the load current and voltage would be inversely
proportional, one goes up, the other goes down.
If the load is resistive or simple reactive, not constant anything; e.g., a
light bulb, the voltage and current are directly proportional, one goes up,
the other goes up as well.
In otherwords, the voltage-current relationship depends on the device.