What is relationship between light intensity and current?
This current is the number of electrons being emitted per second. That is directly proportional to the intensity of the light. So greater intensity means more photons striking the surface and hence an increase in the emitted electrons.
How are current and intensity of light from the bulb related to each other?
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 is the relationship between power and bulb brightness intensity?
The ratio between the power and total visible brightness is actually called the “luminous efficacy”, which is a big phrase meaning a figure measured in lumens per watt. So if the bulb you’re looking at in the shop says 10 watts and 1000 lumens on the packet then the luminous efficacy is 100 lumens per watt.
What is the relationship between the Watts of a light source and light intensity?
Light intensity describes the amount of energy per second falling on a surface, using units of watts per meter squared (W/m“). Light intensity follows an inverse square law. This means that the intensity decreases as the square of the distance from the source.
What is the difference between intensity and current?
The electrical current is a physical phenomenon caused by the displacement of electrons or ions that induce electric fields. By convention, current is considered to be a flux of positive charges. The intensity of the current is the quantity of charge which passes in a conductor per unit of time.
Does intensity depend on current?
Yes current depends on both. intensity decides the number of photons striking the metal surface and frequency decides whether electron will leave the metal surface or not. To cause photo electric effect alone frequency is responsible not intensity.
Does light bulb brightness depend on current or voltage?
So technically speaking brightness depends on both voltage and current. An increase in either voltage or current will increase the brightness of a bulb. In incandescent bulbs, this is the case. But technically speaking, you cannot usually increase current at your end.
What is the difference between luminosity and intensity?
The difference between these two kinds of intensity is part of everyday experience. It helps to give different names to these two ways of measuring intensity. The total amount of light a source emits is called its luminosity. A light-bulb’s luminosity is roughly proportional to the number of watts it consumes.
What is the mathematical relationship between the intensity brightness and distance to the source of light?
The intensity of light is inversely proportional to the square of the distance. This means that as the distance from a light source increases, the intensity of light is equal to a value multiplied by 1/d2,.