Inductor

Inductors are a type of storage which tries to keep current flowing through it consistently by storing electricity when current is high, and discharging when current is low. When current passes through it, it will store a little of it within a magnetic field at the cost of some voltage. If the current dies out, the inductor try to keep the flow going by releasing its its charge. It acts similar to capacitor, though you will lose all your saved power if you disconnect it and unlike a capacitor the released current faces the same way as the input current did.

These require copper wires and a Ferromagnetic Core. The amount of copper wire inserted will set its inductance and the core will determine how much energy is wasted from the process.

When the circuit is open, the power flows through the main loop, accumulating charge. When the circuit is closed, it will loop around the secondary wire until it runs out of power.