To calculate the electrical energy used by the toaster, you can use the formula:
Energy (kWh) = (Power (kW) * Time (h)).
Given that the power rating of the toaster is 400W and it operates for 5 minutes, let's calculate the energy consumption:
First, convert the power from watts (W) to kilowatts (kW):
Power (kW) = 400W / 1000 = 0.4 kW.
Next, convert the time from minutes to hours:
Time (h) = 5 minutes / 60 minutes per hour = 0.0833 hours.
Now, use the formula to find the energy consumption:
Energy (kWh) = 0.4 kW * 0.0833 hours ≈ 0.0333 kWh.
So, the toaster consumes approximately 0.0333 kilowatt-hours (kWh) of electrical energy when operating for 5 minutes.