What factors must be considered when substituting a resistor?

When substituting a resistor, it is crucial to consider multiple factors to ensure proper function and safety within the circuit. The correct answer identifies important aspects such as the ohmic value, which indicates the resistance and is essential for maintaining the circuit's intended operation. The wattage rating is also vital because it determines the maximum power the resistor can dissipate without overheating, preventing potential failure or damage.

Tolerance indicates how much the resistance can vary from its stated value, which can impact the performance and reliability of the circuit. The physical dimensions are significant as they need to fit within the designated space in circuit design, and the type of construction helps determine the resistor's reliability, thermal characteristics, and suitability for specific applications.

By taking all these factors into account, one can ensure that the substituted resistor will perform adequately within the existing circuit design. Simply focusing on just the resistance value or other isolated parameters could lead to improper circuit functionality or safety hazards.