Here are two disadvantages of alternating current (AC):
1. **Loss of Energy in Transmission**:
AC experiences energy losses over long distances due to resistance in the wires. This loss can be significant, especially if the voltage is not stepped up to high levels using transformers. While high-voltage transmission helps reduce losses, the overall efficiency of AC transmission can still be lower compared to DC (direct current) for long distances.
2. **Complexity in Equipment**:
AC systems require more complex equipment, such as transformers, motors, and generators, which can increase the cost and maintenance requirements. Additionally, AC motors are typically bulkier and heavier compared to DC motors for the same power output, which can add to the overall system complexity and cost.