Input / Output Device

Question 1

Digital Camera

Answer 1

1. Shutter opens to let light into a Charged-Couple Device (CCD) sensor at back of lens
2. Intensity of light measured by millions of tiny sensors arranged in grid on sensor
3. Light levels for each pixel represented as binary value
4. Info stored as image in camera memory

Question 2

Laser Printer

Answer 2

Print drum given negative static charge
Laser shine reverse image of page at drum
Laser light reverse charge on the drum
Toner is charged negatively and sticks to positively charged image
Toner is transferred from drum to paper and fused using heat roller