A transformer without power loss crrent in primay coil
Answers
When you connect the load at secondary, current flow starts and power increases with increasing load but the power at the primary and secondary remains same. so primary power also increases. Now it depends upon the usage of transformer that it is step up or step down, You can guess what will happen at primary. i.e. it is the matter of current or power handling capability at constant voltage that sets the limits. Voltage levels have been established and transformed is fully energized then it is only the current and losses which varies with load.
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