To calculate the electrical energy consumed by the toaster, you can use the formula:
Energy (kWh) = Power (kW) × Time (hours)
First, convert the power of the toaster from watts to kilowatts:
Power (kW) = 1200 W / 1000 = 1.2 kW
Next, convert the time from minutes to hours:
Time (hours) = 20 minutes / 60 = 0.3333 hours (rounded to four decimal places)
Now, plug the values into the formula:
Energy (kWh) = 1.2 kW × 0.3333 hours ≈ 0.4 kWh
The electrical energy consumed by the 1200 W toaster in 20 minutes is approximately 0.4 kilowatt-hours (kWh).