Standard cell

A standard cell is like a tiny battery that scientists use to measure electrical changes. It's made up of two different materials called electrodes: one is made of zinc and the other is made of copper. These electrodes are put in a solution called an electrolyte, which helps the electricity flow.

The standard cell creates electricity by a chemical reaction that happens between the zinc and the electrolyte. The reaction makes negative electrons travel from the zinc electrode to the copper electrode, creating a flow of electrical current. This current can be measured and used to study electricity.

Scientists use standard cells because they always produce the same amount of electrical energy no matter where they are used or who uses them. This makes it easier for different scientists to compare their measurements and results. Standard cells also have a very precise voltage, meaning they have a very specific amount of energy, which helps scientists make very accurate measurements.

In summary, a standard cell is a tiny battery made of two different materials that creates a constant flow of electricity through a chemical reaction. Scientists use it to make precise measurements of electrical energy.