# science

posted by .

A microwave oven has a power requirement of 1248 W. A frozen dinner requires 6.9 min to heat on full power.
(a) How much electrical energy (in kWh) is used?

(b) If the cost of electricity is 12 cents per kWh, how much does it cost to heat the dinner?

• science -

look at the units

electrical energy (in kWh) = power (in kW) x time (in hour)

cost of electricity = [electrical energy (in kWh)]*(12 cents/ kWh)

• science -

1.72

## Similar Questions

1. ### science

On a particular day, the following appliances are used for the times indicated: coffee maker, 40 min, and microwave oven, 23 min. Using the power requirements given in the table below, find how much it costs to use the appliances at …
2. ### science

A microwave oven has a power requirement of 1235 W. A frozen dinner requires 6.0 min to heat on full power. (a) How much electrical energy (in kWh) is used?
3. ### phyical science

On a particular day, the following appliances are used for the times indicated: coffee maker, 40 min, and microwave oven, 23 min. Using the power requirements given in the table below, find how much it costs to use the appliances at …
4. ### phyical science

A microwave oven has a power requirement of 1235 W. A frozen dinner requires 6.0 min to heat on full power. (a) How much electrical energy (in kWh) is used?
5. ### science

On a particular day, the following appliances are used for the times indicated: coffee maker, 40 min, and microwave oven, 23 min. Using the power requirements given in the table below, find how much it costs to use the appliances at …
6. ### science

A microwave oven has a power requirement of 1264 W. A frozen dinner requires 5.5 min to heat on full power.
7. ### Science

1. An electric space heater draws 15.0 A from a 120 V source. It is operated, on average, for 5.0h (hours) each day. a) How much power does the heater use and b) At \$.10 per kWh, what does it cost to operate the heater for 30 days?
8. ### nsu

A microwave oven has a power requirement of 1256 W. A frozen dinner requires 4.0 min to heat on full power. (a) How much electrical energy (in kWh) is used?
9. ### physics

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?
10. ### physics

A microwave oven has a power requirement of 1250 W. A frozen dinner requires 6.5 min to heat on full power. If the cost of electricity is 12 cents per kWh, how much does it cost to heat the dinner?

More Similar Questions