Battery life and portability in a device

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Quick Questions

Shade in the A or B circle for each question.

1. A gaming laptop has a powerful CPU and GPU. Compared with a light laptop, what is most likely?

A Longer battery life and less weight

B Shorter battery life and more weight

2. Which statement describes the performance trade-off?

A Faster hardware usually uses more power, heat and weight

B Faster hardware always makes a battery last longer

3. Which laptop is the better choice for a student who carries it to school all day and needs 12 hours of battery?

A A light laptop with an efficient CPU

B A heavy gaming laptop with a powerful GPU

4. A laptop's battery is rated at 10 hours. Why might it last only 3 hours while playing a 3D game?

A The CPU and GPU work harder and use much more power

B The battery shrinks whenever a game is opened

5. Why do gaming laptops often have loud fans?

A Fans are added to make the screen brighter

B Powerful parts make more heat that the fans must remove

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1performance trade-off		AA light laptop uses a low-power CPU and a small battery, so it lasts a long time and is easy to carry but is slower at heavy tasks.
2battery life: 12 hours (light laptop)		BPortability does not give power. Light laptops use low-power parts that struggle with heavy tasks like video editing.
3A gaming laptop has a powerful CPU and GPU, so it gets hot and needs loud fans to cool down.		Cgaming laptop: heat = high, fan noise = loud
4A gaming laptop has a big battery and heavy parts, so it is less portable and its battery drains fast.		DFaster hardware uses more power and adds heat and weight, so a laptop or phone gives up battery life and portability to gain speed.
5The fastest laptop will always have the longest battery life.		EFaster hardware uses more power, so it usually drains the battery sooner. Speed and battery life are a trade-off.
6A thin, light laptop is best for editing 4K video because it is easy to carry.		Fgaming laptop: weight = 2.8 kg, battery = 4 hours

Definitions

performance trade-off

Fill in the Blanks

Complete each line of code by filling in the missing parts.

batteryHours = batteryWh _ powerWatts

IF cpuTemp > 80 ____ fanSpeed = "high"

portable = weightKg _ 1.5

totalWatts = cpuWatts _ gpuWatts

IF ____________ < 3 THEN show("Plug in")

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A weight ← 1.2

B if weight > 1.5:

C say("Light and portable")

Question 2

A cpuPower ← high

B heat ← high

C fanNoise ← quiet

Question 3

A batteryWh ← 50

B powerUseW ← 10

C hours ← batteryWh * powerUseW

Question 4

A lightW ← 8

B gamingW ← 40

C if gamingW > lightW:

D say("Gaming lasts longer")

Question 5

A weight ← 2.5

B batteryHours ← 4

C if weight > 2:

D type ← "light laptop"

Answer Key

Battery life and portability in a device

Section A: Quick Questions

B — Shorter battery life and more weight

A — Faster hardware usually uses more power, heat and weight

A — A light laptop with an efficient CPU

A — The CPU and GPU work harder and use much more power

B — Powerful parts make more heat that the fans must remove

Section B: Match the Pairs

performance trade-off → Faster hardware uses more power and adds heat and weight, so a laptop or phone gives up battery life and portability to gain speed.

battery life: 12 hours (light laptop) → A light laptop uses a low-power CPU and a small battery, so it lasts a long time and is easy to carry but is slower at heavy tasks.

A gaming laptop has a powerful CPU and GPU, so it gets hot and needs loud fans to cool down. → gaming laptop: heat = high, fan noise = loud

A gaming laptop has a big battery and heavy parts, so it is less portable and its battery drains fast. → gaming laptop: weight = 2.8 kg, battery = 4 hours

The fastest laptop will always have the longest battery life. → Faster hardware uses more power, so it usually drains the battery sooner. Speed and battery life are a trade-off.

A thin, light laptop is best for editing 4K video because it is easy to carry. → Portability does not give power. Light laptops use low-power parts that struggle with heavy tasks like video editing.

Section C: Definitions

performance trade-off — Faster hardware uses more power and adds heat and weight, so a laptop or phone gives up battery life and portability to gain speed.

Section D: Fill in the Blanks

batteryHours = batteryWh / powerWatts

IF cpuTemp > 80 THEN fanSpeed = "high"

portable = weightKg < 1.5

totalWatts = cpuWatts + gpuWatts

IF batteryHours < 3 THEN show("Plug in")

Section E: Spot the Error

B — A light laptop has a low weight. 1.2 is not greater than 1.5, so the message would never show. The test should be weight < 1.5.

C — Faster hardware makes more heat, so the fans must spin harder and get louder. The line should be fanNoise ← loud.

C — Battery life is the battery size divided by how much power the device uses. Multiplying gives a wrong answer. It should use /.

D — The gaming laptop uses more power (40 W vs 8 W), so its battery drains faster, not slower. The message should say it drains faster.

D — A heavy device with a short battery life is a gaming laptop, not a light laptop. The type should be "gaming laptop".