The term, 'negative voltage', refers to its direction and has nothing to do with 'negative' in the 'charge' sense. It's used to indicate the direction in which a voltage is acting in relation to another voltage ('positive' if acting in the samedirection; 'negative' if acting in the opposite direction). So your question is confusing: 'negative' in relation to what?
A transformer that increases voltage is a step-up transformer.
Voltage Tarnsformer transforms only voltage. While power transformer transforms both voltage and current.
A transformer will operate with a voltage regulation of zero when it is not supplying a load.
No. A megger's output voltage is not high enough to test the insulation of a high-voltage transformer if, by 'high-voltage transformer ', you mean a distribution transformer or power transformer. Instead, a high-voltage test set or 'pressure tester' (e.g. a 'HiPot' tester) must be used, as these produce far higher voltages.
Variable transformer may also refer as auto transformer. We can vary the output voltage of the transformer. But in the ordinary transformers output voltage is already designed.
LED's are DC voltage. Transformers are AC voltage. There is no positive or negative on AC voltage. You would need a diode to change the AC to DC, then there would be positive and negative voltages.
A transformer that increases voltage is a step-up transformer.
The incoming voltage from the source to the transformer is called primary voltage.
Voltage Tarnsformer transforms only voltage. While power transformer transforms both voltage and current.
If the voltage needs to be increased from a lower voltage to a higher voltage a step up transformer is used. If the voltage needs to be lowered from a higher voltage to a lower voltage a step down transformer is used.
The change in output voltage from no load to full load defines the voltage regulation of that transformer.
three phases
A step-up transformer increases voltage, while a step-down transformer decreases voltage.
A transformer that increases voltage is a step-up transformer.
It depends on the turns ratio of the transformer.
What is the math in a voltage doubler without a transformer? how doesa voltage doubler without a transformer?
A transformer can only increase or decrease the voltage of an alternating current, and it is called step-up transformer or step-down transformer accordingly.