Where Is Energy Stored in a Capacitor?

Where Is Energy Stored in a Capacitor?

Foundational Physics Short Answer: A capacitor stores energy in the electric field created by separated charges on its plates. Charging the capacitor requires work to move additional charge against the increasing voltage. That work becomes energy associated with the...
Why Does a Capacitor Block Steady DC After It Charges?

Why Does a Capacitor Block Steady DC After It Charges?

Foundational Physics Short Answer: A capacitor stops carrying steady direct current after it charges because its voltage builds up until it balances the battery voltage. In a simple battery–resistor–capacitor circuit, that leaves no voltage across the resistor to...
Why Do Real Batteries Have Internal Resistance?

Why Do Real Batteries Have Internal Resistance?

Foundational Physics Short Answer: Real batteries have internal resistance because moving charge through their materials and carrying out the chemical reactions that supply electrical energy are not perfectly lossless processes. When a battery delivers current, some...