The given figure is the symbol for which component for the circuit?

(A) Battery
(B) Key
(C) Resistor
(D) Rheostat

Hint: The electric circuit is the path of electron flow from the source of current or source of voltage. In an electric circuit to allow the current flow, there are several components joining in the electric circuit. These components are to control the current flow in the circuit like battery, key, resistor, and rheostat, etc and the component from given above has to be found.

Complete step by step answer:
Metal atoms are present and in the atom's protons, neutrons and electrons are present. The protons and neutrons are bound in the center but the electrons are free to move around the atoms and further valence electrons are allowed moving in metals freely. Due to bonding these atoms, free electrons are forced to restrict their motion this phenomenon is called resistance. In the electric circuit resistor symbol is used but In case the dynamic resistor which has three external waypoints is called a rheostat. The following figure represents the rheostat.

So, the given figure is the symbol of the rheostat component for the circuit.
So, the correct answer is (D).

Additional Information:
Some more circuit components to understand electric circuit easily:
Battery

Capacitor

Resistor

Key

Inductor

Rheostat


Note: The resistor and inductor and rheostat are different from each other and the symbols of them are also different as shown above. The resistor represents a drop of voltage, the inductor represents the storage of energy but the rheostat represents the dynamic resistance and the resistance of the rheostat can change by its upper external point which is shown in the main figure with the arrow.