A microwave oven has a power requirement of 1250 W. A frozen dinner requires 6.5 min to heat on full power.

How much electrical energy (in kWh) is used?

Energy = 1.25kW * (6.5/60)h = 0.135 kWh.

To calculate the electrical energy used, we need to convert the power requirement and the time to the appropriate units and then use the formula:

Electrical energy (in kWh) = Power (in kW) x Time (in hours)

First, let's convert the power requirement from watts (W) to kilowatts (kW):

Power (in kW) = Power (in W) / 1000

Power (in kW) = 1250 W / 1000

Power (in kW) = 1.25 kW

Next, let's convert the time from minutes to hours:

Time (in hours) = Time (in minutes) / 60

Time (in hours) = 6.5 min / 60

Time (in hours) = 0.1083 hours

Now, we can calculate the electrical energy used:

Electrical energy (in kWh) = Power (in kW) x Time (in hours)

Electrical energy (in kWh) = 1.25 kW x 0.1083 hours

Electrical energy (in kWh) = 0.1354 kWh

Therefore, the electrical energy used by the microwave oven to heat the frozen dinner is 0.1354 kWh.

To calculate the electrical energy used by the microwave oven, we can use the formula:

Energy (kWh) = Power (kW) * Time (hours)

1. First, we need to convert the power requirement from watts to kilowatts. Since 1 kilowatt is equal to 1000 watts, we divide the power requirement by 1000:

Power (kW) = 1250 W / 1000 = 1.25 kW

2. Next, we need to convert the time from minutes to hours. Since there are 60 minutes in an hour, we divide the time by 60:

Time (hours) = 6.5 min / 60 = 0.1083 hours

3. Now, we can calculate the electrical energy used by multiplying the power and the time:

Energy (kWh) = 1.25 kW * 0.1083 hours = 0.1354 kWh

Therefore, the microwave oven uses approximately 0.1354 kWh of electrical energy to heat the frozen dinner.