The maximum current in an ac circuit is related to the rms current by:

where

is the rms current and

is the maximum current.
If we re-arrange the formula and we use

, we can find the value of the maximum current:
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Answer:
It is constructed with a high mass and a high raidus.
Explanation:
The rotational inertia I for every object is calculated as:
cMR^2 = I
where c is a constant, M is the mass of the object and R the radius of the object.
So, for a flywheel, the rotational inertia is calculated as:
I = 
Then, for constructed a flywheel with the maximun rotational inertia we have to set the maximum mass and the maximun radius.