because the pencil take the a litte enrgy.
A pencil has nothing to do with the brightness of a light bulb.
Light waves change speed when they travel from air into the material of the pencil, and then change speed again when they exit the pencil back into the air. This change in speed causes the light waves to refract or bend.
The appearance of the pencil is due to how light is reflected off its surface. When light waves hit the pencil, they can be absorbed, transmitted, or reflected. The change in speed of the light waves as they pass through the material of the pencil can affect how much light is reflected and perceived by our eyes, resulting in the appearance of the pencil.
The pencil lead does not have a significant effect on the brightness of the bulb in a circuit because it does not conduct electricity efficiently. In order for the bulb to light up brightly, the circuit needs an efficient conductor such as a metal wire to allow the current to flow easily and light up the bulb.
The light waves coming from the pencil change speed when they move from air (faster speed) to the glass or water (slower speed). This change in speed causes the light waves to refract or bend.
The brightness of the light will change with the voltage of the battery.That's not always related to its physical size.The higher the voltage is, the brighter the light will be, until you reach oneparticular voltage where the light goes out, because you have burned it outwith overvoltage.
Loudness is to brightness as sound is to light.
push the white button and the p. use the arrows.
That is called a rheostat or a dimmer.
Refraction will make the light change direction, when it changes from water to air.Refraction will make the light change direction, when it changes from water to air.Refraction will make the light change direction, when it changes from water to air.Refraction will make the light change direction, when it changes from water to air.
When light travels from water to air, it changes speed and bends, causing the pencil to appear bent. This effect is known as refraction. The change in speed causes the light rays from the pencil to change direction as they pass through the interface between water and air, creating the illusion of a bent pencil.
A LED light dimmer works by controlling the amount of electrical current flowing to the LED fixture. By adjusting the current, the dimmer can change the brightness of the light emitted by the LED fixture.