What is the cost of leaving a PC on 24 hours a day?

The cost of leaving a PC on 24 hours a day varies based on its power consumption and local electricity rates. On average, a typical desktop PC uses about 200-500 watts per hour. If we assume an average of 300 watts and an electricity rate of $0.12 per kWh, the monthly cost would be approximately $21.60. However, actual costs can differ based on the specific hardware and local energy prices.