I just need the equation on how to do it. I'm so lost :'( help please!!!!!!

The '120-V' is what we in the engineering profession call a "red herring". You don't need it to solve the problem. The answer would be the same if the blow drier were operating from a 440-V outlet, or any other kind (just as long as the blow drier is designed to operate on whatever voltage it was plugged into.)
Power = 750-W = 0.75 kW Time = 13 minutes = 13/60 of an hour Energy = (power) x (time) = (0.75 kW) x (13/60 of an hour) = 0.1625 kWh
Cost per unit of energy = $ 0.1 per kWh Total cost = (energy) x (cost per unit of energy)
Total cost = (0.1625 kWh) x ( 0.1 p er kWh ) = 0.01625 = 1.625 cents
The other answer has his significant figures correct, but shows what happens when you don't carry your units all the way through.

Answered by AL2006 | 2024-06-10

750 W = 0.75 kW 0.75 ∗ 60 13 ​ = 0.1625 kWh 0.1625 ∗ 0.10 = $ 0.1625 ​

Answered by Ryan2 | 2024-06-10

To calculate the energy used by a 1200-W toaster for 1 minute, use the formula E = P × t . The energy consumed is approximately 0.0200 kWh, which costs about 0.18 cents at 9.0 cents per kWh.
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Answered by AL2006 | 2024-12-24