What would be the cost of a 2500W kettle boiling for 5 minutes?

To calculate the cost of using a 2500W kettle for 5 minutes, first convert the power to kilowatts (2.5 kW) and the time to hours (5 minutes is 1/12 of an hour). The energy consumption would be 2.5 kW × (1/12 hour) = 0.208 kWh. If the electricity rate is, for example, $0.12 per kWh, the cost would be 0.208 kWh × $0.12 = approximately $0.025, or 2.5 cents.