11 Myths About Power Density (.PDF Download)

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Power density is an often confusing and misunderstood concept. Here are 11 myths about power density, followed by the facts that debunk them.

1. A large battery has higher power density than a small capacitor.

False: A small capacitor might have the same power output as a large battery, but the small physical size of the capacitor makes it a higher-power-density device.

For example, a tiny capacitor may have the same power output as a large battery. However, because the capacitor is so much smaller in volume, it has a higher power density.

Why?: Batteries are able to store more energy, but capacitors can give off energy more quickly! Since high power density systems release their energy quickly, they can recharge quickly as well.