Grade 4Agriculture

Fuel Conservation

Charcoal, firewood, gas, kerosene; conservation methods to minimise wastage (1.3, 7 lessons).

📖 5 min read · 3 worked examples · 7 practice questions

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The lesson

Fuel is a material that we burn, and when we burn it, it releases energy. This energy helps us do many things. For example, we use fuel for cooking delicious meals like ugali and chai, for heating our homes when it's cold, and for lighting lamps so we can see at night. Here in Kenya, we have some common fuels. Charcoal and firewood are very common, especially in rural areas. Many families use these every day for cooking. Other common fuels used in towns and cities. Gas, which we call LPG, is used in many urban homes for cooking. Kerosene is also used in stoves and lamps. These are cleaner and often safer. Different places use different fuels. Rural homes often rely on firewood and charcoal, while urban homes prefer gas and kerosene. Great job, everyone – now you know what fuel is and what kinds we use in Kenya!

Class, let's look at this question: why do we need to conserve fuel? Think about the charcoal, firewood, or gas your family uses at home. Why should we not waste it? First reason: fuel costs money. When we waste charcoal or gas, we are wasting our family's hard-earned money. Every bit of fuel you save means more money for other important things like food or school supplies. Second reason: burning too much fuel hurts our environment. Think about the smoke that fills the kitchen — that's not good for our lungs. When we cut down trees to make charcoal, we lose our forests. That's called deforestation. Here's the good news: when we use fuel wisely, we save money and protect our planet at the same time. It's a win-win! Every small saving — like using a lid on your sufuria to cook faster — helps both your family and the earth. Here's something to think about: if you use less firewood, you save money and you save trees. That's a double blessing. Next time you help cook, remember — using fuel wisely is a smart choice for everyone.

Today we'll learn simple ways to conserve fuel at home. These tips help save fuel, save money, and also help our environment. First tip: use a lid when cooking. When you put a lid on your sufuria, it traps the heat inside. That means your food cooks faster and you use less firewood or gas. Try it the next time you cook githeri or chapati! Second tip: cut your firewood into smaller pieces. Small pieces burn more completely, so you get more heat from each piece. This is very helpful if your family uses a jiko or a three-stone fire. Third tip: turn off the stove or kerosene lamp when you're not using it. Don't leave them burning for no reason. This saves fuel and also keeps your home safe from accidents. To remember: lid on the pot, small firewood pieces, and switch off when done. These three simple habits can make a big difference in how much fuel you use!

More ways we can save fuel at home. First, clean your stove or jiko regularly. Blocked holes waste fuel, but regular cleaning saves money. Next, use an energy-saving stove like the Kenya Ceramic Jiko. It uses 30 to 50 percent less fuel! Finally, consider renewable fuels like biogas and solar cookers. They are clean, cheap, and good for the environment. These three steps — clean your stove, use efficient jikos, and try renewable energy — will help you save fuel and protect our planet.

Let's wrap up with our final summary. These are the key tips to remember for using fuel wisely in your home. Every small action makes a big difference for your family's money and for our environment. First, always use a lid when you are cooking. This traps the heat and cooks food faster, so you use less firewood or gas. Second, cut your firewood into small pieces and keep your stove clean. A clean stove burns fuel better. Third, choose efficient stoves that use less fuel, and turn off appliances like gas stoves and charcoal burners when you are done. Every little action helps you save money and protect our beautiful Kenyan environment. I am proud of your attention and your questions. Before we finish, I want you to think about how you can use these tips at home. Let's hear from some of you.

Worked examples

How Much Firewood?

We'll figure out how much firewood a family needs in one week. Here's the problem: The family uses 2 kilograms of firewood every single day. We need to find out how much they use in 7 days — that's one full week. Step one: Write down the daily amount. The family uses 2 kg per day. We start with 2 kg. Step two: Multiply by 7 days. Take the 2 kg and multiply: 2 times 7 equals 14. We get 14 kg. That's our answer: The family uses 14 kilograms of firewood in one week. Always remember to write the daily amount first, then multiply by the number of days.

Saving Charcoal by Using a Lid

Worked Example 2. This is about Mama Njeri cooking beans. Watch how using a lid helps her save charcoal. Without a lid, Mama Njeri uses 1 kilogram of charcoal to cook her beans. When she puts a lid on the pot, she only uses 0.7 kilograms. That's a big difference! Let's calculate the savings: 1.0 minus 0.7 equals 0.3 kilograms. She saves 0.3 kilograms every time she cooks beans. If she cooks beans twice a week, then she saves 0.6 kilograms of charcoal in one week. That's enough to cook another meal!

Comparing Gas and Kerosene Costs

Worked Example 3. We are going to compare how much money a family spends on gas versus kerosene for cooking. First, look at the gas. A family buys a 6 kg gas cylinder for 1,200 shillings. This cylinder lasts for one whole month. Gas costs 1,200 KES per month. The family uses 2 litres of kerosene every week. Each litre costs 100 shillings. Every week they spend 2 times 100, which is 200 shillings. In one month there are about 4 weeks. 200 shillings each week times 4 weeks equals 800 shillings per month for kerosene. Gas costs 1,200 KES per month, and kerosene costs 800 KES per month. Kerosene is cheaper. Gas is cleaner and lasts the whole month without refilling. Families need to choose what works best for them.

Practice questions

  • Which fuel comes from cutting down trees? Think about what people use for cooking in villages.
  • Which actions save the most charcoal? Remember, we want to use less charcoal.
  • These ideas help us use less charcoal, which means fewer trees need to be cut. Keep practicing and thinking about how we can save energy at home.
  • Asks: Which is NOT a way to save fuel? The options are: using a gas cooker instead of a charcoal jiko, leaving the fire burning when not cooking, using a lid on a sufuria, and soaking beans before cooking them.
  • Think about it — which one wastes fuel? Leaving the fire burning when you're not cooking is definitely not saving fuel.
  • Why is using a lid a good conservation method? The lid traps heat inside the sufuria.
  • Remember: to save fuel, always use a lid, soak beans before cooking, and never leave the fire burning when you're not cooking. Small changes make a big difference!

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