Final answer:
The cost of electricity for using a 3000-watt clothes dryer for one hour, with an electricity cost of $0.20 per kWh, is $0.60.
Step-by-step explanation:
To calculate the cost of electricity for operating a 3000-watt clothes dryer for one hour, you need to convert watts into kilowatts and then multiply by the number of hours used and the cost per kilowatt-hour. One kilowatt (kW) is equal to 1000 watts, so a 3000-watt dryer is 3 kW. Therefore, if you use this dryer for 1 hour, the energy consumed is 3 kW × 1 hour = 3 kWh. At a rate of $0.20 per kWh, the cost to run the dryer for one hour is 3 kWh × $0.20/kWh = $0.60.