12:06 PM webassign.net TFVV * 60% A certain waffle iron is rated at 0.75 kW when

Question

12:06 PM webassign.net TFVV * 60% A certain waffle iron is rated at 0.75 kW when connected to a 120-V source. (a) What current does the waffle iron carry? (b) What is its resistance? The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value. (a) At this average price, calculate the cost of leaving a 75-W porch light on for two weeks while you are on vacation? (b) At this average price, calculate the cost of making a piece of dark toast in 3.00 min with a 915-W toaster? (c) At this average price, calculate the cost of drying a load of clothes in 40.0 min in a 5.00103-W dryer? Batteries are rated in terms of ampere-hours (A·h). For example, a battery that can produce a current of 2.00 A for 3.00 h is rated at 6.00A h. (a) What is the total energy stored in a 9.0-V battery rated at 45.0 A h? kWh (b) At $0.0770 per kilowatt-hour, what is the value of the electricity produced by this battery? Home My Assignments Extension Request

Explanation / Answer

1) P = VI

750 = 120I

I = 6.25 A

current is 6.25 A

b) V = IR

R = 120 / 6.25 = 19.2 ohm

so the resistance is 19.2 ohm

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