In a parallel connection of lights, what would the voltage across a 10 watt light be, if it's connected alongside a 20 watt light?

In a parallel connection, all components share the same voltage across their terminals. This means that each light connected in parallel will experience the same voltage despite having different power ratings.

For instance, if a 20-watt light is connected in parallel with a 10-watt light, they are both subjected to the same voltage from the power source. The wattage of each light indicates the power they consume but does not affect the voltage across them in a parallel configuration. Therefore, the voltage across the 10-watt light will be the same as the voltage across the 20-watt light.

If, for example, the lights are connected to a power source of 120 volts, both lights would have 120 volts across them, regardless of their different wattage ratings. This consistent voltage across all components is a defining characteristic of parallel circuits.