Part A How many k W h of energy does a 500- W toaster use in the morning if it i

Question

Part A How many kWh of energy does a 500-W toaster use in the morning if it is in operation for a total of 5.0min ? Express your answer to two significant figures and include the appropriate units. Energy =   kWh  
Part B At a cost of 9.0 cents/kWh, estimate how much this would add to your monthly electric energy bill if you made toast four mornings per week (16 times per month). Express your answer using two significant figures. Cost =   cents/month  
Part A How many kWh of energy does a 500-W toaster use in the morning if it is in operation for a total of 5.0min ? Express your answer to two significant figures and include the appropriate units. Energy =   kWh  
Part A How many kWh of energy does a 500-W toaster use in the morning if it is in operation for a total of 5.0min ? Express your answer to two significant figures and include the appropriate units. Energy =   kWh  
Energy =   kWh   Energy =   kWh  
Part B At a cost of 9.0 cents/kWh, estimate how much this would add to your monthly electric energy bill if you made toast four mornings per week (16 times per month). Express your answer using two significant figures. Cost =   cents/month  
Part B At a cost of 9.0 cents/kWh, estimate how much this would add to your monthly electric energy bill if you made toast four mornings per week (16 times per month). Express your answer using two significant figures. Cost =   cents/month  
Cost =   cents/month   Cost =   cents/month  
Energy =   kWh  

Explanation / Answer

A. 5 min = 5/60 hrs = 1/12 hours; 500 W = 0.500 kW

energy = power * time = 0.500* 1/12 = 0.042 kW-Hour

B.total cost = 9 cents *4 weeks * 4 mornings * 0.042 kwh per day = 6 cents per month

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