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# What are these transformer graphs about?

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This picture describes the behaviour of a single phase transform under resistive,inductive and capacitive loads(from left to right)

How what exactly is $V_{1}$ ?Is it the voltage at the primary side?And what are $I^{'}_{2}$ , $I_{1}$ and $I_{0}$? Is $I^{'}_{2}$ the current at the secondary side?If $I^{'}_{2}$ is the current at the secondary side then there is no way $V_{1}$ is the voltage at the primary side because in the first out of the 3 pictures(from left to right) there is a 0 degrees phase difference between $V_{1}$ and $I^{'}_{2}$ and by taking the transformer's equivalent circuit:

and ignoring the branch related to the core of transformer,the transformer itself has a inductive behaviour due to the inductance of the primary and secondary windings so $V_{1}$ cannot be the primary voltage simultaneously with $I^{'}_{2}$ being the secondary current.

So what are the quantities of these graphs?

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For R loads I is in phase with V.

For L loads , V lags I up to 90 deg.
For C loads, I lags V up to 90 deg.

The trigonometric tangent angle is the ratio of impedance: Real to reactive.

Your lectures or ref. book will give all the details.

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