# What determines the brightness of a bulb in a circuit?

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## What determines the brightness of a light bulb current or voltage?

The higher the voltage v the higher the current. If the brightness is caused by a flow of electrons through the filament, a higher voltage will–all things being equal– drive more electrons to flow through the filament. So the brightness is a function of both current and voltage, and can be said to depend on both.

## 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.

## How do you increase the brightness of a bulb in a circuit?

Placing cells in series increases the voltage in the circuit by 1.5 V for each cell. Increasing the voltage increases the brightness of the bulb. When a bulb in a series circuit is unscrewed all bulbs in the circuit go out.

## What makes each bulb glow?

Electricity flows through a thin wire in the light bulb called the filament. The filament used in a bulb has a property called “resistance.” … A filament has a lot of resistance to electricity. Therefore as a result of this, the filament heats up and starts glowing, converting electrical energy to light energy.

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## Why does the bulb glow brighter and brighter when electric cells are connected in series?

In short, In series, both bulbs have the same current flowing through them. The bulb with the higher resistance will have a greater voltage drop across it and therefore have a higher power dissipation and brightness.

## What happens to brightness of bulbs in parallel?

When the bulbs are in parallel, each bulb sees the full voltage V so P=V2R. Since a bulb glows brighter when it gets more power the ones in parallel will glow brighter. See, the parallel combination of resistors reduces the effective resistance of the circuit.

## Why is one light bulb brighter than another?

High resistance bulbs are brighter in series circuits If two bulbs in series aren’t identical then one bulb will be brighter than the other. Brightness depends on both current and voltage. So in series high resistance bulbs are brighter because they have a bigger p.d. across them.