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A transformer's 'no load' current is not 'high'. On the contrary, it is zero!

'No load' means that there is nothing connected to the secondary (output) of the transformer -i.e. it is an open circuit. So a transformer's secondary 'no load' current is zero! The primary current still has to provide a magnetising current, but that current will be very small.

Don't forget, a 'light load' means little current is drawn, so the load must have a high resistance; a 'heavy load' means lots of current is drawn, so the load must have a low resistance.

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13y ago

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Related Questions

The current load of a transformer is the current drawn by the?

load


What is zero current transformer?

It is a transformer with No load attach to it.


What is the percentage of the no-load current in a transformer to its full load current?

2 to 5% of full load current


What is full load magnetising current of transformer?

is it primary current ?


Why no load current in transformer small?

No load current is energizing current. This is effectively "lost" power, power used in the transformer to energize the core. It, therefore, should be small!


Function of no-load in transformer in a open-circuit?

To calculate the no load current from transformer & core loss is also calculated.


How is no load current reduced?

No load current, in a transformer for example, is the current necessary for exciting the transformer. If you wish to keep it energized, and you need to keep it energized at full voltage, there is nothing you can do to reduce this other than replace the transformer with one that has lower no load current. If you are referring to a different piece of equipment, you may need to specify what you are meaning by "no load current".


What is the function of the primary current when the secondary winding of the transformer is open?

When the secondary of a transformer is opened, there is no longer any load on the transformer. There will be some current flowing in the primary winding, which is needed to induce the voltage in the secondary. This primary current is referred to as the "no load" current, and is indicative of the core losses in the transformer.


What happens if transformer wattage is much less than load wattage?

If the load current is too high, the power lost in the transformer windings will be too high and it will overheat. If the voltage is excessive, the power lost in eddy currents in the magnetic core will be too high and it will overheat.


What will happen when we change value of load resistance in transformer?

The secondary load current will change. This, in turn, will cause the primary current to change (the primary current being the phasor sum of the [IS (Np/Ns)] and the primary current (Io).


What is the no load current of 1600 kva transformer?

No load current depends on the design of the transformer, and what voltage it is energized at. It will typically be below 1% of full load, and can be significantly below 1% for utility sized transformers.


What is the secondary rating of a 50KVA transformer?

The secondary current is determined by the load, not by the transformer. For example, if the secondary voltage is 50 V and the load is 100 ohms, then the secondary current will be 0.5 A. If the load is 25 ohms, then the secondary current will be 2 A. It is important that a continuous secondary current doesn't exceed the rated secondary current of the transformer.