Final answer:
The toaster will use 2.604 kilowatt-hours of energy in 3.5 hours.
Step-by-step explanation:
To calculate the kilowatt-hours of energy used by the toaster, we can use the formula:
Energy (kWh) = Power (kW) x Time (hours)
In this case, the power of the toaster is given as 6.2 A (amperes) at 120 V (volts), which can be converted to kilowatts:
Power (kW) = Current (A) x Voltage (V) / 1000
Substituting the values, we get:
Power (kW) = 6.2 A x 120 V / 1000 = 0.744 kW
Now, we can calculate the energy used:
Energy (kWh) = 0.744 kW x 3.5 hours = 2.604 kWh
Therefore, 2.604 kilowatt-hours of energy will be used in 3.5 hours.