TV Viewing Distance: Why 55-Inch Means 1.7m and 65-Inch Means 2.0m
The recommended TV viewing distance is the screen diagonal times 1.2. Here is where that multiplier comes from, and how to reverse it into a maximum screen size.
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#구매가이드 13 posts
How to Read Image Sensor Size Labels: Why 1 Inch Means 16mm
A 1-inch sensor measures 16mm diagonally, not 25.4mm. Converted to area, 1/1.3" and 1/1.4" differ by 16%, and 1/2.55" is three times smaller.
6 vs 12 Place-Setting Dishwashers: 176 Won or 251 a Cycle
A six-setting countertop uses 0.68kWh and 8.7L a cycle; a twelve-setting built-in 0.97kWh and 14L. Reduced to a per-setting basis from published specs, a Grade 1 fourteen-setting model draws less than the six.
SSD Endurance: How Long 600TBW Really Lasts at 20GB a Day
Burning a 1TB SSD's 600TBW inside five years takes 329GB of writes a day. At 20GB a day it takes 82 years. Converted to DWPD, every capacity lands on the same 0.33.
How to Read an Intel Core Ultra Laptop CPU Name: X, H and 25W
The X prefix on a Core Ultra laptop chip refers to graphics, not cores. Every Core Ultra Series 3 part shares the same 25W base TDP — and the number that actually decides sustained performance appears nowhere in the name.
Cordless Vacuum Suction Units: What W, AW and Pa Actually Measure
Pascals measure vacuum pressure, not suction power. In Korean Consumer Agency testing, six vacuums advertised at 18,000–48,000Pa delivered just 58–160W, and only three of ten products met their stated figures.
How to Choose a Robot Vacuum: Suction, LiDAR, and Mopping
Robot vacuums split on four things: suction (Pa), navigation sensor, mopping style, and dock. Most homes are fine at 4,000Pa with LDS LiDAR; caked grime needs 2kg-plus rotating pressure.
How to Choose a Gaming Mouse: Reading DPI, Polling Rate and Sensor
The real battleground in gaming mice is not the DPI number but weight, sensor and wireless latency. Here is a calculated look at the gap between 1000Hz and 8000Hz, with priorities by use case.
Mechanical Keyboard Switches Compared: Red, Blue, Brown, Black
Red is a light 45g linear that glides down, Blue is a loud 60g clicky, and Brown adds a 55g tactile bump. This guide compares actuation force, actuation point and noise, then walks through how to pick a switch by use case.
How to Choose a Power Bank: mAh, Rated Capacity, PD Output
A 20,000mAh pack won't charge your phone four times. Here is the gap between labeled and usable capacity (Wh conversion, conversion loss), PD output per device, and airline limits, worked out in numbers.