In Resonance circuit , when voltage is given, current is increasiang and decreasing?

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In induction cooking project.. I used resonance circuit and when I give voltage ,current is increasing up to 5 and then it decreases to 4.5 and remains 4.5 A. What is the reason ?

Thanks for answers..
 
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In a first order, the current magnitude is a function of drive frequency, not time. You should possibly clarify the question.
 

FvM said:
In a first order, the current magnitude is a function of drive frequency, not time. You should possibly clarify the question.
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In induction cooking project.. I used resonance circuit and when I give voltage ,current is increasing up to 5 and then it decreases to 4.5 and remain like that. What is the reason ?
 
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Copper tc and respective resistance increase could be a reason. A 30 degree C temperature increment results in 10 percent higher resisitivity.
 

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