What happens to the brightness of bulb if you add another bulb in the circuit?

Increasing the number of bulbs in a series circuit decreases the brightness of the bulbs. In a series circuit, the voltage is equally distributed among all of the bulbs. Bulbs in parallel are brighter than bulbs in series. In a parallel circuit the voltage for each bulb is the same as the voltage in the circuit.

Why does the glow of the two bulbs connected in series become dim as compared to when each is connected as a single bulb in the circuit or both are connected in parallel?

If you now connect them in series, each light bulb now receives only 60v (due to voltage division), and assuming the same current (0.5A), it only receives 30W! Therefore, if the light bulbs light up at all, they each only has 30 watts of power, so they will be dimmer.

What would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?

What happens to the brightness of each bulb in a parallel circuit if more bulbs are added (in parallel) to the circuit? Nothing happens to the brightness of the light bulbs in the parallel circuit if the power supply is capable of supplying the additional current.

What may happen if you add another bulb to both of your setups?

When you plug in that second bulb, both will get equally dim, because you have added more resistance to your circuit, which decreases the flow of current. Adding another light bulb in series decreases the current because our battery now has more work to do! You just add all of the different resistance values together.

Why did the other bulb turns off when you unscrewed the other?

As more and more light bulbs are added, the brightness of each bulb gradually decreases. This observation is an indicator that the current within the circuit is decreasing. If one of three bulbs in a series circuit is unscrewed from its socket, then it is observed that the other bulbs immediately go out.

When you had two light bulbs connected in the circuit did they glow with the same brightness or was one brighter than the other?

A series circuit is a Voltage Divider. Two light bulbs on the same series circuit share the voltage of the battery: if the battery is 9V, then each bulb gets 4.5 volts. A parallel circuit avoids this problem. Two bulbs in a simple parallel circuit each enjoy the full voltage of the battery.

Are bulbs brighter in series or parallel?

Two light bulbs on the same series circuit share the voltage of the battery: if the battery is 9V, then each bulb gets 4.5 volts. Two bulbs in a simple parallel circuit each enjoy the full voltage of the battery. This is why the bulbs in the parallel circuit will be brighter than those in the series circuit.

Will the bulbs in both the circuits glow with the same brightness?

No the bulbs won’t glow with the same brightness in both circuits. The bulb in parallel circuit will glow brighter than when connected in series.

What may happen if the filament of one the bulbs in your first setup melts Why?

In a simple circuit, including one in an incandescent light bulb, electricity travels through a closed circuit, passing over a filament, causing it to glow brightly. If the current is too great, the filament will melt, or blow out, causing the circuit to become open.