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I would like to draw electrical circuits with right angles in connectors, but I am not able to see this option in draw.io, they are always rounded.

Most circuits have right angles ... A simple example http://wpcontent.answcdn.com/wikipedia/commons/thumb/6/67/Resistors_in_series_and_parallel.svg/195px-Resistors_in_series_and_parallel.svg.png

As endpoint (see example above), I am using right now a BPMN start icon

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Select any/all edges that have the wrong rounding. On the right panel, under the style tab, there's a pull-down to select the edging stlye:

Edge corner styling pull-down in format panel

Select "Sharp" in that pull-down. Further down that panel is a "Set as default style" button that will set the current style for all new edges.

Set as default style button in format panel

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