(2014?Gansu a mold) as shown in the figure, the figure B for the ideal transformer, connected to the alternating voltage rms value of the power supply remains unchanged. Bulb L1 and L2 completely phase
A, S after disconnecting the equivalent of the load is reduced, the total resistance increases, the current in the secondary coil decreases, the current in the original coil also decreases, so A is correct C error;
B, the secondary coil current decreases, so the constant resistor divider voltage decreases, but the voltage at the ends of the secondary coil remains unchanged, so the brightness of the bulb L1 becomes brighter, so B is incorrect D is correct;
Therefore, the choice: D.