Rocket sketches a dream laptop. "Huge screen! Giant battery! Fastest processor ever! And it fits in my pocket!" Raven looks at the drawing and tilts her head.
"What do you notice about the size? A huge screen and a pocket do not agree."
Nova draws a small seesaw in the air. "Would you like a hint? When one side goes up, the other side comes down. Designers call it a trade-off."
A trade-off means giving up a little of one thing to get more of another. Every design is full of them.
A bigger screen is easier to see. But it can use more power. The battery may run out sooner.
A faster processor does more work each second. But it uses more power, so the battery drains sooner.
More storage holds more files. A drawing tablet needs plenty for its pictures.
A bigger battery lasts longer. But a pocket device has no room for a huge one.
| If you want more | You give up some |
|---|---|
| Screen size | Battery time and small size |
| Processor speed | Battery time |
| Battery time | Small size |
| Small size | Big screen and big battery |
Trade-offs explain why computers come in different shapes. Each shape picks a different balance.
A desktop stays on a desk. It can be big, fast and cool, because it never moves. It plugs into the wall.
A laptop folds and travels. It carries its own battery, so it works away from the wall.
A tablet is thinner still. It trades a keyboard for a touchscreen and an even lighter body.
A tiny computer inside a thermostat is built for one small job. That keeps it small and cheap.
| Statement | True or false? |
|---|---|
| A bigger screen can use more power. | ? |
| A desktop can be bigger because it does not move. | ? |
| A faster processor uses less power. | ? |
| A good designer gets everything with no trade-offs. | ? |
Rocket looks at the seesaw and crosses out pocket. "If I want a huge screen, it needs a bag," he says.
Then he crosses out fastest processor ever. "Homework does not need that. A medium one stays cooler."
His new sketch is a laptop. Medium screen, medium speed, a battery that lasts a school day. It fits the purpose.
Smart balancing! You can see the seesaw in every design now. Tomorrow you will design for people, not just for jobs. You will make a computer everyone can use.