Homework - Find where the components belong
Process of elimination/deduction

Always start with what you know. 

(i) There are three components in the circuit - resistor, diode &amp; capacitor.

(ii) There are three terminals (A,B,C) 

(iii) There is only one component connected between each terminal.

There are only two possible unique configurations of this circuit.



(i) Either the anode of the diode is connected to the end of the resistor (and the cathode to the end of the capacitor)

(ii) Or the Cathode of the diode is connected to the end of the resistor (and the anode to the end of the capacitor)

Between any TWO TERMINALS you will have a circuit consisting of the 'component' which is connected to the other two component connected in series with each other and parallel to the component. 

By using DC to test the components you (should) know that;

(i) the resistor will conduct the same amount of current in both directions AND the capacitor in the parallel path (once charged) will prevent current flowing through the diode regardless of polarity

(ii) the diode will appear as a short circuit in one direction only AND the (charged) capacitor will prevent current flowing in the RC parallel circuit.

(iii) Applying the test across the capacitor only the parallel  circuit (resistor/diode) will conduct (- in one direction it will give the same (or similar) reading as the resistor, in the opposite direction it will show an open circuit (no current).)

Its now down to you to work out which terminal is A, which B and which C and which way around is the diode connected. For extra credit you could also calculate the value of the resistor in ohms.