Reserve power

Reserve power is when you have an extra source of energy that you can use if the main source of energy runs out or stops working. It's like having an extra battery for your toy in case the first one dies.

For example, if you have a generator at home that gives electricity and the regular power goes out, the generator is your reserve power that you can use to keep your lights on and appliances running.

Or when you use a cellphone, it has a battery that powers it up, but if the battery gets low or dies, you have a reserve power bank or a charger to plug it in and recharge it again.

Having reserve power is important because it helps us stay prepared, especially in emergencies, and it lets us keep using our devices or machines without interruption.