To remove fluctuations and make dc steadier, you can put an inductor in series and/or a capacitor in parallel.
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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
dc series motors
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It holds AC energy and passes DC. This will take the ripple out of DC circuits.
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.