In an RC circuit, the maximum voltage across a capacitor can be greater than, less than, or equal to the maximum voltage across a resistor, depending on the specific circuit configuration. In a simple RC circuit with one ideal DC voltage source, one resistor, and one capacitor, whether arranged in series or parallel, the maximum voltage across both components will be the same. The behavior of the circuit is influenced by factors such as the values of the resistor and capacitor, as well as the applied voltage. Understanding these relationships is crucial for analyzing circuit performance. Proper guidance can clarify these concepts further.