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A complete circuit with a capacitor is turned on. Charges are moved from one plate of the capacitor, through the battery, and all the way around to the other plate. Which of the following occur during that time? Kinetic energy is decreased. Thermal energy is decreased. Chemical potential energy is increased. Electrical potential energy is increased.

Question

A complete circuit with a capacitor is turned on. Charges are moved from one plate of the capacitor, through the battery, and all the way around to the other plate. Which of the following occur during that time? Kinetic energy is decreased. Thermal energy is decreased. Chemical potential energy is increased. Electrical potential energy is increased.

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Solution

When a complete circuit with a capacitor is turned on, the following occurs:

  1. Chemical potential energy is decreased: The battery uses its stored chemical potential energy to move the charges around the circuit. As the charges move, the chemical potential energy in the battery decreases.

  2. Electrical potential energy is increased: As charges accumulate on the plates of the capacitor, the electrical potential energy in the capacitor increases. This is because work is done by the battery to move the charges against the electric field between the capacitor plates.

  3. Kinetic energy is not necessarily decreased or increased: The kinetic energy of the charges would depend on their speed. If the charges move at a constant speed, their kinetic energy would remain constant. If they accelerate or decelerate, their kinetic energy would increase or decrease, respectively.

  4. Thermal energy is increased: As charges move through the resistive elements of the circuit (like the wires and the internal resistance of the battery), they encounter resistance which causes them to lose some of their kinetic energy. This lost kinetic energy is converted into thermal energy, heating up the circuit. So, the thermal energy of the circuit increases.

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