Which of the following does not has a correct depiction of the element involved in the heating effect of electric current?
Correct option is D.
$$\textbf{Concept used:}$$
$$\bullet $$ Heating effect of current.
$$\textbf{Correct option: D}$$
$$\textbf{Explanation for correct option:}$$
$$\bullet $$ We are asked which of the given options does not use the heating effect of current.
$$\bullet $$ $$CFLs$$ and Tubelights do not work on the heating effect of current.
$$\textbf{Explanation for incorrect option:}$$
$$\bullet $$ Filament of a bulb, the coil of a heater and an electric iron, all these work on the principle of heating effect of current. So they are correct depictions. We were asked incorrect depiction.
$$\bullet $$ All these have a coil of high resistance which produces heat when current is passed through them, given by $$H=I^2Rt.$$