why does light increase or decrease

Question

86What happens to the brightness of light emitted by a
lightbulb when the current in the filament increases

Answer 1

Hi Richard;

watts=(volts)(amps)

power=(volts)(current)

watts=joules/second

As you may already know, joules is a unit of work.

As either the voltage and/or level of current increases, so too does the wattage.  Henceforth, the brightness, amount of work, performed by the light proportionately increases.