Find the resistance of a wire of length 0.65m, 0.2mm and resistivity 3X10^-6 ohm metre.
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The resistance of an ohmic material is given by
where l is the length and a is the cross sectional area. For a circular wire, this area is that of a circle:
Then solving for diameter, d:
where l is the length and a is the cross sectional area. For a circular wire, this area is that of a circle:
Then solving for diameter, d:
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:
where
If we re-arrange the formula and we use