What are the resistance values for R1, R2, and R3?

The resistance values for R1, R2, and R3 are typically determined based on the specific requirements of a circuit and the desired outcomes regarding voltage, current, and overall functionality. In this case, the values of 1.0 kΩ, 2.2 kΩ, and 4.7 kΩ are ideal for certain configurations, possibly allowing for specific voltage drops and current flow that align with standard circuit design principles.

These resistance values may also facilitate a particular kind of electrical behavior in terms of total resistance, voltage dividers, or RC time constants when these resistors are combined in parallel or series arrangements. The values are common in practice, adhering to the E12 or E24 series of preferred numbers, which ensure components are available and facilitate easy design considerations.

The other sets of resistance values might not achieve the same circuit performance or may not be feasible based on the intended application. For example, certain combinations could lead to insufficient or excessive current flows, incorrect voltage divisions, or mismatches with other components in the circuit that require precise values for proper operation.