Real batteries, like ideal batteries, separate charge and create a potential difference. However, they have what is called internal resistance r. Thus, the voltage the battery actually provides to us is called the terminal voltage.
Terminal Voltage = ɛ - Ir <= ɛ
- How Batteries Work - Battery electricity working principle - YouTube by Engineering Mindset Battery is used store energy. We use them to power small electrical devices. Energy is stored as chemical energy, and turned into electrical energy.
Positive end = cathode
Negative end = anode