ELI5: Explain Like I'm 5

Electrochemical equivalent

Okay kiddo, electrochemical equivalent is like how much a tiny jolt of electricity can change something.
Imagine you have a tiny toy car that needs a battery to move. When you put a battery in the car, it starts moving because the tiny jolt of electricity from the battery makes the car go. The electrochemical equivalent is the amount of electricity needed to move a certain amount of stuff on the car, like the wheels or the motor.
It's like measuring how much sugar you need to make cupcakes – you need a certain amount of sugar to make the cupcakes taste just right. Similarly, you need a certain amount of electricity to make things work.
Scientists and engineers use electrochemical equivalent to figure out how much electricity they need to make something work properly. It's like having the recipe for cupcakes, but instead of measuring sugar, they're measuring electricity.