Laser printers use static electricity to print documents. Let’s see how it is done.
- Inside the printer, an object called the image drum is given a positive charge.
- A laser is then shone onto the drum.
- This creates a negative charge on parts of the drum (see Figure 1).
- This negative charge is given the shape of whatever is to be printed.
- Powdered ink (toner) inside the printer is given a positive charge.
- Thus the toner is attracted towards the negatively charged areas of the image drum.
- Negatively charged paper is then rolled across the image drum.
- The charge on the paper is stronger than the charge on the image drum.
- so the powdered ink on the drum sticks to the paper (Figure 2).
- The paper is then heated, fusing the ink powder to the paper.
Static Electricity & Charge – Important Questions and Answers – Here you will find static electricity FAQs and details of a few more other applications where static electricity is used.