# Best answer: How do you determine the brightness of a light bulb in a circuit?

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## What do you notice about the brightness of the bulbs in each 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.

## Does brightness depend on 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.

## What determines light bulb brightness?

The brightness of a lightbulb is given by its power. P = I2R, and so brightness depends on current and resistance. If the bulbs are identical, they have the same resistance. … Therefore, when you are asked to rank the brightness of identical bulbs, you are really being asked to rank the amount of current through each.

## What determines the brightness of a light wave?

The brightness of light is related to intensity or the amount of light an object emits or reflects. Brightness depends on light wave amplitude, the height of light waves. Brightness is also somewhat influenced by wavelength.

## What will happen to the brightness of the bulb in this simple circuit?

The brightness of the bulb increases when the voltage is increased. All the bulbs in the circuit go out when a bulb is removed. The brightness of the bulbs decreases when the number of bulbs is increased. The bulbs in parallel are brighter.

## What did you notice about the brightness of the bulbs current as you added more resistors?

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. So for series circuits, as more resistors are added the overall current within the circuit decreases.

## What happens to the brightness of bulbs in a parallel circuit?

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.

## Does increasing voltage increase LED brightness?

Adjusting the voltage lower or higher will change the brightness, but only because it also changes the current- higher voltage means the current will increase in an LED.

## How is the brightness in the 2 circuits related to charge flow or current?

Brightness gets dimmer since less current or charge passing through each bulb AND smaller voltage drop across each bulb (the voltage gain at the battery is now distributed among 3 bulbs as opposed to just one).

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