Identify the energy source for each item in the grid—wind, people, battery, fuel, or electric.

Let’s go through each picture one by one and figure out what energy source it uses. The options are: Wind, people, battery, fuel, or electric.

We’ll look at each item and think about how it gets its power.

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Row 1:

1. Power lines / electricity towers → These carry electricity from power plants to homes. So the energy source is electric.
2. Wind turbines → They spin when wind blows. So that’s wind.
3. Person carrying a box → A person is using their own muscle power. That’s people.
4. Propane tank (gas canister) → This holds fuel like propane for grills or heaters. So that’s fuel.

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Row 2:

5. Kids on a swing set → Kids push themselves or each other — they’re using their bodies. That’s people.
6. Gas pump → It pumps gasoline into cars. Gasoline is a type of fuel. So that’s fuel.
7. Electric fan → You plug it in or use batteries, but most fans like this run on electricity from an outlet. So that’s electric.
8. Washing machine → Plugs into the wall — runs on electricity. So that’s electric.

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Row 3:

9. Airplane → Most airplanes run on jet fuel. So that’s fuel.
10. Hair dryer → Plugs into the wall — uses electricity. So that’s electric.
11. Exercise bike → You pedal it with your legs — powered by people. So that’s people.
12. Flashlight → Usually runs on batteries. So that’s battery.

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Row 4:

13. Watch (analog wristwatch) → Many watches run on small batteries. Unless it’s solar or mechanical, we assume battery. So that’s battery.
14. Garbage truck → Runs on diesel or gasoline — both are fuels. So that’s fuel.
15. Hand-crank flashlight or radio → You turn the crank with your hand — that’s human power. So that’s people.
16. TV remote control → Uses small batteries inside. So that’s battery.

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Now let’s double-check any tricky ones:

- Flashlight? Yes, usually battery-powered unless specified otherwise.
- Watch? Same — standard analog watch = battery.
- Hand-crank device? Definitely people — you have to turn it.
- Exercise bike? People pedaling — yes.
- Airplane? Fuel — correct.
- Garbage truck? Fuel — correct.

Everything checks out.

Final Answer:
Row 1: electric, wind, people, fuel
Row 2: people, fuel, electric, electric
Row 3: fuel, electric, people, battery
Row 4: battery, fuel, people, battery