# Electron beam of a computer monitor

• JJones_86
In summary, a beam current of 410µA means that 410µC of charge strike the screen per second, equivalent to 6.56e-23 electrons. However, there may have been a calculator error when calculating the number of electrons per second.
JJones_86

## Homework Statement

The current in the electron beam of a computer monitor is 410 µA. How many electrons per second hit the screen?

## The Attempt at a Solution

A beam current of 410µA means that 410µC of charge strike the screen per second. This is equivalent to (410e-6C)/(1.6×10-19C/e) = 6.56e-23 electrons...

But it's telling me that it's the wrong answer, any help is appreciated!

I don't think you mean 10-23electrons
410 x10-6 / 1.6 x10-19 = 410/1.6 x10-6 - -19 = 250 x10-6 +19 = 250 x10+13

It's worth knowing the rules for doing calculations with exponents so you can estimate the answer before entering the numbers in a calculator

Last edited:
Oops, calculator error, thanks!

## What is an electron beam?

An electron beam is a stream of high-speed electrons that are used to produce images on a computer monitor.

## How does an electron beam work in a computer monitor?

The electron beam is generated by an electron gun at the back of the monitor. It is then focused and directed by electromagnetic coils to hit phosphor dots on the screen, creating the pixels that make up an image.

## What is the purpose of an electron beam in a computer monitor?

The electron beam is responsible for creating the images on the computer monitor. By rapidly scanning across the screen, it creates a series of pixels that form the images we see.

## What is the difference between a CRT and LCD monitor in terms of electron beam?

CRT monitors use an electron beam to create images, while LCD monitors use a different technology called liquid crystal display. This means that CRT monitors can produce brighter and more vibrant colors, but are bulkier and consume more energy compared to LCD monitors.

## Can an electron beam be harmful to humans?

An electron beam in a computer monitor is not harmful to humans. However, if the monitor is damaged or malfunctioning, it is possible for the electron beam to emit radiation that could be harmful. It is important to properly dispose of old or damaged monitors to prevent any potential harm.

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