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Scenario: I have current carrying conductor with a current transformer around it. If the load is rated at 5V, 2A and only requires 2W of power, but the primary side conductor is carrying 100V 12A.

Question: In this scenario would the power rating of the transformer be determined by the load or the primary side rating. AKA would I need a transformer core rated at 1200VA or 10VA.

Background: I am designing an energy harvesting unit to power my raspberry pi I am aware that regulatory circuitry will be needed, but let's omit that for now. I plan to use a switch mode power converter for regulation, shown in diagram above.

Some proof would be great as I have heard conflicting answers to this question.

Scenario

I have current carrying conductor with a current transformer around it. If the load is rated at 5V, 2A and only requires 2W of power, but the primary side conductor is carrying 100V 12A.

Question

In this scenario would the power rating of the transformer be determined by the load or the primary side rating. AKA would I need a transformer core rated at 1200VA or 10VA.

Background

I am designing an energy harvesting unit to power my Raspberry Pi

I am aware that regulatory circuitry will be needed, but let's omit that for now. I plan to use a switch mode power converter for regulation, shown in diagram above.

Some proof would be great as I have heard conflicting answers to this question.

Scenario: I have current carrying conductor with a current transformer around it. If the load is rated at 5V, 2A and only requires 2W of power, but the primary side conductor is carrying 100V 12A.

Question: In this scenario would the power rating of the transformer be determined by the load or the primary side rating. AKA would I need a transformer core rated at 1200VA or 10VA.

I plan to use a switch mode power converter for regulation.

I am aware that regulatory circuitry will be needed, but let's omit that for now. Some proof would be great as I have heard conflicting answers to this question.

Scenario: I have current carrying conductor with a current transformer around it. If the load is rated at 5V, 2A and only requires 2W of power, but the primary side conductor is carrying 100V 12A.

Question: In this scenario would the power rating of the transformer be determined by the load or the primary side rating. AKA would I need a transformer core rated at 1200VA or 10VA.

Background: I am designing an energy harvesting unit to power my raspberry pi I am aware that regulatory circuitry will be needed, but let's omit that for now. I plan to use a switch mode power converter for regulation, shown in diagram above.

Some proof would be great as I have heard conflicting answers to this question.