The correct answer is: A. Resistance only.
In an AC circuit, power is dissipated in resistance only. This is because resistance is the only component in an AC circuit that converts electrical energy into heat energy. Inductance and capacitance store energy, but they do not dissipate it.
Resistance is the opposition to the flow of current in a circuit. It is measured in ohms (Ω). The amount of resistance in a circuit is determined by the length, cross-sectional area, and type of material used to make the conductor.
Inductance is the property of a conductor to store energy in a magnetic field. It is measured in henries (H). The amount of inductance in a circuit is determined by the number of turns of wire in the coil and the permeability of the material used to make the coil.
Capacitance is the property of a conductor to store energy in an electric field. It is measured in farads (F). The amount of capacitance in a circuit is determined by the area of the plates and the distance between the plates.
In an AC circuit, the current and voltage are constantly changing. This means that the resistance, inductance, and capacitance are also constantly changing. The amount of power dissipated in a circuit is determined by the square of the current and the resistance.
The following is a brief explanation of each option:
- Option A: Resistance only. This is the correct answer. Resistance is the only component in an AC circuit that converts electrical energy into heat energy. Inductance and capacitance store energy, but they do not dissipate it.
- Option B: Inductance only. This is incorrect. Inductance stores energy in a magnetic field, but it does not dissipate energy.
- Option C: Capacitance only. This is incorrect. Capacitance stores energy in an electric field, but it does not dissipate energy.
- Option D: None of the above. This is incorrect. Power is dissipated in resistance only.