Exercises: Mobile phones, tablets and other devices

Name three components that your cell phone shares with a computer and explain in one sentence what each one does inside the phone.

Think about these devices: laptop computer, tablet, cell phone, game console and e-reader. Choose three of them and explain one task for which each is better than the others.

The figure compares a computer and a cell phone: the central capsule shows the components they share, but one is missing, as shown in the diagram.

Which shared component is missing from the capsule and what is it used for? Look also at the differences shown below each device and explain a task in which the computer wins and another in which the cell phone wins.

Name the device corresponding to each description: (a) fits in a pocket and is used to make calls; (b) has a large screen designed for reading for hours without eye strain; (c) connects to the TV and is operated with a controller for gaming; (d) is worn on the wrist and tracks your steps.

Name three things that a cell phone and a tablet have in common (touch screen, battery, apps...) and one important difference between them, explaining how that difference is noticed when using them.

Explain what a device battery is and why desktop computers do not need a battery to operate, whereas cell phones, tablets and laptops do.

A handheld console has a screen, battery, CPU and memory, like a cell phone. Do you think it is more similar to a cell phone or a desktop computer? Defend your answer with two arguments.

An e-reader lasts for weeks without charging and a tablet only lasts a few hours. Relate this difference to their screens (E Ink vs. bright touch screen) and to the amount of calculations each device performs.

You have to do three tasks: write a long essay, edit a photo for a presentation, and inform your group of a change of plans. State which device you would use in each case (cell phone, tablet or computer) and justify your choice considering the screen, keyboard and comfort.

A tablet with a keyboard case costs almost as much as a laptop computer. Analyse two advantages and two disadvantages of studying using only the tablet (notes, assignments, online exam) and conclude whether you think it could replace the laptop in your case.

A cell phone has $64\ \text{GB}$ of storage and each photo takes up on average $12\ \text{MB}$. Knowing that $1\ \text{GB}$ is equivalent to $1\,000\ \text{MB}$, calculate using the division $\frac{64\,000\ \text{MB}}{12\ \text{MB}}$ how many photos would fit if the cell phone were empty, and then explain two reasons why in reality significantly fewer fit.

Your grandfather wants a device solely for viewing family photos, making video calls and reading the online newspaper. Choose between a cell phone, tablet or computer, and justify your choice considering screen size, simplicity of use and where he will use it.

Compare writing a four-page essay on a cell phone using an on-screen keyboard with writing it on a laptop: analyze the speed, comfort and errors you would make in each case, and describe a situation in which the cell phone would indeed be a good option for writing.

An e-reader has $8\ \text{GB}$ of storage and each book takes up on average $2\ \text{MB}$. Calculate using the division $\frac{8\,000\ \text{MB}}{2\ \text{MB}}$ how many books fit and estimate how many years you could read at a rate of one book a day (a year has $365$ days). Comment on whether it makes sense to worry about space on this device.

A new cell phone is smaller and lighter than one from five years ago, yet it has a better camera, more memory and a larger battery. Explain how it is possible for devices to improve while becoming smaller (miniaturization of components, greater efficiency) without resorting to "magic".

A "water-resistant" cell phone and a normal one fall into a puddle. Explain what it means for a device to be sealed against water and dust, and name two other everyday devices gaining this protection (watches, earphones...), explaining why they need it.

The most powerful cell phones get hotter and drain the battery faster. Relate this fact to their components (CPU, screen, internet connection) and suggest three specific settings on the cell phone to make the battery last longer, explaining which component "rests" with each setting.

A photographer travels for two weeks doing reports: she needs to review and select photos every night, write articles and send them, and does not always have access to power outlets. Choose between a laptop, tablet, or cell phone as the main device for the trip, justify your choice (screen, battery life, weight, storage) and explain which accessories you would recommend to her.

Many people replace their cell phone every two or three years even though theirs still works. Analyze the reasons that push them to replace it (worn-out battery, updates no longer arriving, fashion...), evaluate the environmental impact of this habit and suggest three actions to extend the life of a cell phone.

A manufacturer commissions you to define the technical specifications of the ideal computer or tablet for 1st-year ESO students with a budget limit of 250 pesos per unit. Resolve these three technical trade-offs, justifying your decision for each one: 1) Screen size: 8 inches (very light but small text) or 11 inches (heavier but better visual ergonomics)? 2) Casing: ultra-thin aluminum or ruggedised plastic with shockproof rubber corners? 3) Battery: 4000 mAh (lightweight device) or 7500 mAh (more weight in the backpack)? Finally, explain why buying the most expensive and powerful model in a store (for example, a 1200 pesos laptop) for this use would be a technical and practical mistake.

Current cell phones run very good games, yet handheld consoles continue to sell. Analyze what these consoles offer that cell phones do not (physical controls, dedicated game catalog, screen designed for gaming) and explain what would need to change for cell phones to completely replace them.

A cell phone battery lasts two days when new and barely one after a year. Explain what happens to the battery through charging and discharging cycles and suggest three specific habits (partial charges, avoiding heat, not using it while charging...) so that it ages more slowly.

A school is considering buying a tablet for every 7th grade student. Analyze three advantages and three problems with this measure (breakage, distractions, equality between families, maintenance...) and conclude with your reasoned verdict: would you buy it or look for another solution?

Compare the environmental impact of manufacturing a cell phone versus a desktop computer: materials and minerals, manufacturing energy, transportation, and lifespan in years. Explain what the phrase "the most eco-friendly device is the one you already have" refers to and whether you agree with it.