Three Closed Boxes Black Boxes With Two Plug Sockets On Each Are Present For Inv

.Three closed boxes (black boxes) with two plug sockets on each are present for  investigation. The participants have to find out, without opening the boxes, what kind of elements are in them and measure their characteristic properties. AC and DC meters (their internal resistance and accuracy are given) and AC (5OHz) and DC sources are put at the participants’ disposal.

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