E-Coord

E-Coord screenshots

It can analyze time-current curves for overcurrent protection devices
E-Coord 3.2 : Curves Window

Alternative downloads

Battery-Resistor Circuit
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It is simply a graphical representation of what a resistor does in a circuit.
Circuit Construction Kit (DC and AC)
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Fun, interactive, research-based simulations of physical phenomena.
Signal Circuit
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This program is a great tool for simulating electrical circuits.