Which choice most accurately describes the method of storing electrical energy in a capacitor? 1. a capacitor can store energy when placed in a circuit, and the protons flow onto both plates of the capacitor. 2. a capacitor can store energy when placed in a circuit, and electrons flow from one plate of the capacitor and on to the other. 3. a capacitor can store energy when placed in a circuit, and the electrons flow off of both plates of the capacitor. 4. a capacitor can store energy when placed in a circuit, and the electrons flow onto both plates of the capacitor.