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Transformers can be used to step up voltage output at the expense of current, or they can step up current output at the expense of voltage. Thus in an ideal transformer, the power in (P = I*V) will equal the power out. Real transformers will loose a small amount of power due to the resistance of the coil and the eddy currents in core.  The transformer simulations below are for ideal transformers.   



The above simulation shows how changing the load in the secondary circuit effects the current in the primary.  It also shows the effect of moving secondary ground on test point voltage readings. Test point reading are made with respect to ground.  If the two secondary test points were measured with respect to each other, the transformer output reading would stay stay at 240 volts regardless of where the ground were placed.   




The above simulation shows the effect that changing  the load in the secondary has on the current in the primary.  Also note how balancing the load in the two branches of the secondary cancel out the current in the neutral line. The neutral line carries the difference between the two branch currents.