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When the impedance of the secondary side is converted to the primary side, it should be divided by the square of the ratio, that is, by 4. The secondary side ωl = 0.8ω, which is converted into the primary side 0.2ω, and the capacitive reactance of the primary side is1(0.05 ω) = 20/ω, so the resonant frequency is ω= 10.

When the secondary resistance is converted into a primary resistance of 2 ohms, it is equal to the primary resistance, the primary current is 50/4A, the secondary current is 50/8A, and the voltage is calculated by itself.