PH-1294

Circuit components

Physics · Secondary 4 · Medium · Circuit components

A student uses a variable resistor in series with a diode and a

1.5\,\text{V}

cell to obtain the diode’s I–V graph. What is the purpose of the variable resistor in this experiment?

To vary the current through the diode safely over a range of values
To keep the current through the diode constant
To reverse the direction of current through the diode
To increase the e.m.f. of the cell

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