Beachcomber wrote:

Since the voltage is double, the ability of the 240 V. circuit has a
higher capacity to deliver more current for a given resistance than at 120 V.

If by "circuit" you mean "the wires in the wall," you might more clearly say:

Since the voltage is double, the ability of the 240 V. circuit has a
higher capacity to deliver more power for a given resistance than at 120 V.

Nick