You would have to measure the lumen output before and after to determine is there was a change. There are light meters that can do this. You need to be aware of any background or ambient light during such measurements.
Increase the voltage supply.
The brightness of a bulb would not change if you added a second bulb in parallel with the first.Unless, of course, the increased current exceeded the power supply's capacity causing a reduction in voltage.
You alter the brightness of a bulb by changing the voltage or frequency that is applied to the bulb.
A pencil has nothing to do with the brightness of a light bulb.
because the pencil take the a litte enrgy.
Almost none.
That is called a rheostat or a dimmer.
The brightness of a light bulb directly has no direct relationship with magnets and wire. The bulbs brightness is determined by the wattage of the bulb. The higher the wattage of the bulb the brighter the bulbs light output.
u see the light bulbs on a series circuit's brightness evolves and the brightness on a parallel's circuit dont
The brightness of a standard bulb is directly proportional to the amount of voltage drop across the bulb itself. Thus, to increase the brightness :-Pass more current across the bulb by reducing the resistance of the circuitIncrease the voltage across the bulb, or the circuit. Change the supply.
It will if the batteries are connected in series. If they are connected in parallel, the lamp will burn longer, but not brighter.
brightness