It is also possible to build electromagnets or coils able to work at various frequencies at the condition to use variable capacitors.

Some fingerprint sensors use capacitors.

These use capacitors on the towed sled, allowing efficient energy recovery, lower voltage power supplies and lighter cables.

This sort of crossover uses inductors, capacitors and sometimes other circuitry components.

The authors also suggest future electrical storage using capacitors or batteries.

Audio equipment, for example, uses several capacitors in this way, to shunt away power line hum before it gets into the signal circuitry.

Woodward started to design and build devices using capacitors and a series of PZT thick disks.

This is the reason for using electrolytic capacitors in standard or switched-mode power supplies behind the rectifier for smoothing application.

Some experimenters have even used super capacitors to store energy.

At this point the power factor can be brought to near unity, using capacitors or inductors as required.