Final answer:
A capacitor is the component that Ronnie should add to remove electrical signal fluctuations or noise in his circuit.
Step-by-step explanation:
When designing an electrical circuit, if Ronnie wants to remove electrical signal fluctuations or noise, he should add a capacitor to his circuit. A capacitor is an electronic component that stores electrical energy in an electric field. It can help smooth out voltage fluctuations and reduce noise in the circuit.
Learn more about Electrical circuit components