To remove fluctuations and make dc steadier, you can put an inductor in series and/or a capacitor in parallel.
dc
A electric car uses either a DC or AC motor. Typically they use DC motors.
The output of an electric fencer is a high voltage pulse of DC voltage.
DC current
Traditionally, electric trains used DC series motors because they provide high starting torque, making them ideal for moving heavy trains from a standstill. Today, most modern electric trains use three-phase AC induction motors or permanent magnet synchronous motors (PMSMs) powered by electronic converters, as they offer greater efficiency, better speed control, and lower maintenance.
It holds AC energy and passes DC. This will take the ripple out of DC circuits.
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It is capacitor
After the D and C, the uterus is clean and healing , ready for any inplantation.
A capacitor blocks DC but allows AC.
Power consumed by the appliance = (DC supply voltage) x (DC current)
Examples of DC electric motors are the starter in your car and the motor in a DC controlled elevator, to name just two.