What voltage is observed across all resistors when 3 unequal resistors are connected in parallel across a 120 volt line?

When resistors are connected in parallel, the voltage across each resistor is the same and is equal to the voltage of the power supply. In this case, since the resistors are connected across a 120-volt line, each resistor experiences the full voltage of 120 volts, regardless of their individual resistances. This is a fundamental characteristic of parallel circuits.

Parallel connections allow for multiple pathways for current to flow, and the voltage drop across each component (resistor, in this case) mirrors the supply voltage. Therefore, since the power supply in this scenario delivers 120 volts, that is the voltage observed across all three unequal resistors connected in parallel.