HOW STUFF WORKS
QUIZZES

The Ultimate Photocopier Quiz
by Staff
The photocopier has evolved from being a luxury to a necessity in any modern office. Many people take the performance of a photocopier for granted. Do you have any idea how these amazing machines produce exact copies of a document?

### What is the one basic physical principle that makes a photocopier work?

• Opposite charges attract.
• Mirrors reflect light.

### What is a good way to see a simple version of the "opposites attract" principle in operation?

• You can generate a static charge on a balloon by rubbing it on a sweater and see it attracting bits of paper.
• Both of the above.

### How does an image get from the paper onto the copier drum?

• The drum is selectively charged by static electricity to match only the white spots on an original.
• The drum is charged by static electricity, positive for black spots and negative for white spots on an original.
• The drum is selectively charged by static electricity to match only the black spots on an original.

### How is selective static charging accomplished on a photocopier drum?

• photo chromic reaction
• intense light
• photo opulence

• negative
• positive
• neutral

### What happens with your original document after you place it on the glass and press the start button?

• The document is subjected to focused intense ultra violet light moving from one end to the other.
• The document is subjected to focused intense infrared light moving from one end to the other.
• The document is subjected to focused intense incandescent light moving from one end to the other.

### What is the electrical state of a drum before light is reflected onto it from your original?

• The entire surface of the drum is charged with a positive charge.
• The entire surface of the drum is charged with a negative charge.
• The entire surface of the drum is made neutral, carrying no charge.

### How does light manage to remove the positive charge from areas on the drum?

• Wherever a photon of light hits the photoconductive drum, emitted electrons neutralize the positive charges.
• Wherever a photon of light hits the photoconductive drum, emitted electrons reverse polarity of charges.
• Wherever a photon of light hits the photoconductive drum, emitted electrons intensify negative charges.

### What is the toner that is used in a photocopier?

• dry ink
• carbon particles
• fine plastic based powder

### What is the coating of photoconductive material on the drum usually made from?

• selenium or silicon
• germanium
• both of the above

### How does toner that is held on the drum make its way to a sheet of blank paper to form a copy?

• The paper is preheated so toner sticks to its warm surface as it passes above the rotating drum.
• The paper is given a positive charge before it passes the drum and this charge pulls the toner onto the paper.
• The paper is pushed hard against the drum by a second roller where the slightly tacky toner sticks.

### How does the toner manage to stay on the paper once the paper looses its positive charge?

• Paper containing the image is heated and pressed in order to fuse the toner image to the paper.
• The copy of the image is sprayed with a fine mist of setter fluid and dried by a heating bar.
• The paper is heated at the same time it is charged causing the toner to stick to the spots where it is attracted.

### What components inside a photocopier charge the drum and paper with a positive charge?

• static collator
• ion generator
• corona wires

### What function does the lens have in a photocopier?

• The lens serves to increase intensity and focus of light from the lamp onto an original document.
• The lens allows you to adjust fine focus of an image to improve clarity of your original onto an enhanced copy.

### What is the function of the fuser inside a photocopier?

• Without allowing any sticking, the fuser must melt and press toner into the paper.
• The fuser shoots microwave energy at the copy without touching it in order to melt the toner into the paper.
• The fuser interrupts power to your photocopier to protect it from damage due to an electrical problem.
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