The resistive elements of fuses, lightbulbs, heaters, etc., are non-linear (i.e., the resistance is dependent on the current through the element). Assume the resistance of a fuse (Figure P2.45) is given by
R0 = 0.11?; and P is the power dissipated in the resistive element of the fuse. Determine the rated current at which the fuse will melt (that is, “blow”) and thus act as an open-circuit.
(Hint: The fuse blows when R becomes infinite.)
Find:
The rated current at which the fuse blows, showing that this happens at:
Assumptions:
Analysis:
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