300w一小時多少度電

To convert watts to kilowatt-hours (kWh), divide the number of watts by 1000.

Therefore, 300 watts is equal to 0.3 kilowatts.

To calculate the number of kilowatt-hours in one hour, multiply the power consumption in kilowatts (0.3 kWh) by the number of hours.

For example, if you consume 300 watts for 1 hour, it would be 0.3 kWh x 1 hour = 0.3 kilowatt-hours.