How do transformers increase voltage to decrease current?

The power loss can be minimized if we decrease the current but in electrical terms there is only one way to do this that we can use transformer which in turn will increase the voltage and decrease current in order to keep the power constant (neglecting minor losses). read more

Before a few days ago I always thought that when transformers decrease the voltage, the transformers increase the current. Then on another thread at Physics Forums, people have told me that when transformers decrease voltage, they don't increase the current. The PFers told me that the transformers increase the current available. read more

In both cases, the load is 120 watts but by doubling the voltage, we get away with 1/2 the current, allowing smaller wires. Similarly, we could start out with the 240V 1/2A, put that into a 2:1 transformer, and get out 120V 1A for the 120V lightbulb. For the 240V section of the transmission, we can reduce the wire size due to the lower current. read more