There is no end to learning and learning possesses no age bar. High School is a time where people grasp absorb materials better since the mind is young, fresh and not stressed. Science is always better taught in terms of creativity and science models for class 8 do just that. Practical teaching is the best way to understand concepts. Unfortunately, students, these days are taught only to remember but not really learn and understand the concept behind what they study. Let us now study the top ideas for science models for Class 8.
Science Models for Class 8 – How to go about it?
Technology and digitization have made it very convenient for a student to learn and grow. There are various websites and material available on the internet that allows a student to explore the subject from various angles and aspects. There are educational stores that sell many products which provide kits and even raw material for numerous working models, project and material for the students to experiment and come up with their own models.
By the time a student comes to middle school, they start taking part in quite a few school activities. Every school has a science exhibition or science fair that they organize on a regular basis. You need to think out of the box to be able to compete and be recognized. One has to have innovative ideas and brainstorm with their team to make the best possible utilization of the resources that they have.
Even in class, many times there are projects to be submitted and one needs to come up with ways of utilizing the given theories and concepts.
Here are some simple and easy to follow science models for class 8 with a step by step description of how to do them.
Science Models for Class 8 – Idea #1: Potato Battery
The chemical reaction between two different electrodes and one electrolyte help generate electricity in a battery. The proven method for this process is using Copper and Zinc electrodes and Sulfuric acid as an electrolyte.
You could use potato as an electrolyte, a fresh potato has a lot of juice which serves the purpose. Let us see how to generate electricity using a potato.
Image Credits: Science Buddies
- Two fresh potato
- Zinc Electrode
- Copper Electrode
- Alligator clips
- A Digital clock
First insert the zinc and copper electrodes into the potatoes, close to each other but not touching. Then use alligator clips to connect electrodes to the digital clock so that the voltage can be measured. The current will pass through the wires and activate the digital clock.
A digital multimeter can be used to measure the voltage of the current flow from the potatoes. On an average, a digital multimeter shows 1.2 volts of electricity between the electrodes. The result may vary during the experiment, it is recommended to measure for at least five times and get the average result. You have now created electricity by using a potato battery. The challenge is, however, to produce electricity in a larger amount for a longer time.
Science Models for Class 8 – Idea #2: Electric Generator
Via this experiment a moving magnetic field is fixed at the center of a coil and electricity is produced enough to light up a tiny bulb.
Image Credits: Youtube
- Coil of Magnet Wire
- Strong Magnet
- Light bulb
- Wood pieces
- The base for light bulb
- Wood glue
- Insulation tape
First, make a hole in the middle of wooden pieces. Then find a large nail and thread one of the circles to the nail. You need to cover the quarter part of the nail with a single layer of tape. Thereafter, add more tape on the other sides of the circle. Take the insulated part of the nail and wind the coil of magnet wire between the two circles. Take a free end of the wire and attach it to a bulb or an LED. Now, bring the magnet close to the head of the nail and while holding it near move the magnet from side to side. The bulb or LED will start lighting up you will see.
The concept behind this is that the generator model operates by a magnetic field. The number of wire turns along with the size of the coil is what contributes to the increase in voltage. The strength of the coil also contributes to the magnetic field strength. To induce electricity the magnetic fields should be in continuous motion. Therefore the magnet or the coil has to be in motion constantly. The systematic movement should be done so that the coil is continuously near the magnetic field. The nail used in the experiment helps concentrate the magnetic field. It plays a vital role. It acts as a magnetic flux since it is wrapped with coil and boosts the efficiency of increase in voltage.
Science Models for Class 8 – Idea #3: Solar Energy Project
This is one of the simplest science experiments that you can do and prepare for your science fair. It deals with the efficiency of the solar heating working model.
There may be a variation in the results if the project is performed outdoor due to the wind and weather condition. Thus it is recommended to conduct the experiment indoors.
You need to use reflectors in this project, concentrating the solar energy in one small place to collect and store heat energy. This experiment helps in understanding the efficiency of solar energy.
Image Credits: Byjus
- A wooden stand
- Concave or converging mirror
- Tube to flow liquid.
- Black paper
First up, mount the wooden stand, then you roll pieces of black paper around the tube. You need to attach the tube to the concave mirror in a way where the sunlight concentrate in one direction. Fill the tube with water and let it stand. Record the temperature of the tube after 30 minutes.
To be able to correctly calculate the efficiency of the concave mirror solar heater, you can divide the temperature increase by the direct sunlight. You will notice that the temperature of the water increases after 30 minutes since the heat is transferred through the concave mirror and concentrated on the tube.