Задача id12068

The transformer has two coils. The ratio of the number of turns n1 in the first coil to the number of turns n2 in the second coil is 0.115. No-load current at voltage U1=1 V on the first coil I0=3.5 mA. The electrical resistance r1 of the wire of the first coil is 9 Ohms, the resistance r2 of the wire of the second coil is 730 Ohms. What is the electrical resistance r2 of the load in the second coil circuit if the current I2 in the secondary is 5 mA? What is the current strength I1 in the primary circuit? The voltage at the ends of the primary coil U1 is 1.5 V.

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