Which costs more, running a 2,000-W hair dryer for 3 min or leaving a 40-W lamp on overnight (10 h)?

Refer to the figure. 12.0 V (a) Calculate P3 (in W). W t Additional Materials Russell 2000 +1.34% (1=? Reading V₁ = ? 1.80 Ω (b) Find the total power (in W) supplied by the source. W ww R₁ R₂ 6.40 Ω 1₂ = ? Q Search ww R₂ 12.02 V-V-V₁ = ?

A 300 W immersion heater is placed in a pot containing 2.00 L of water at 20°C. (a) How long will the water take to rise to the boiling temperature, assuming that 70.0% of the available energy is absorbed by the water? (b) How much longer is required to evaporate half of the water? (a) Number i (b) Number i Units Units

Suppose you leave a 50 W bulb on for a month. Approximately how much will you pay for using that much energy? (Assume that electricity is charged at a rate of $0.10/(kW hour).) A) 3 cents B) 30 cents C) 3 dollars D) 30 dollars E) 300 dollars

Physics What is the total cost of using all of the following at9¢ per kilowatt-hour?(i) A 1200-W toaster for 30 min(ii) Six 50-W bulbs for 4 h(iii) A 400-W washing machine for 45 min(iv) A 4800-W electric clothes dryer for 20 min

Q8 Q9 Q10 A small wind turbine has 3 blades that are 1m radius each. Take the air density on a typical day to be 1.24 kg/m³ and a wind of 12 m/s. What are the theoretical and actual power outputs of the wind turbine if a multimeter connected to the generator shows 12.1A and 33V of output 2 kW and 500 W 2 kW and 400 W 0.59kW and 400 W 0.59 kW and 500 W 2.5 kW and 1 kW 1 2 3 4 5 6 B C A A photobioreactor (PBR) is used to grow microalgae using sequestered CO₂ gas from a cement plant. Estimate the total volume, in litres, of the PBR to capture 1 tCO₂ per year assuming the growth rate is 1 g/L per day. A A D B E C D E B C D E 152L 202L 1520L Below are 6 statements on the subject of shallow geothermal aquifers listed 1 to 6. Which answer, A to E, contains only incorrect statements? 8950L 202800L Answer 2, 4 and 5 1, 2 and 3 Answer 3,4 and 6 A 4, 5 and 6 3, 4 and 5 Shallow geothermal aquifer exploitation does not rely on the thermal gradient. B B Solar heat could affect shallow geothermal…

Midterm Practice A conventional light bulb running at 40 W for 4 hours per day. How much energy does it spend in one month?   Select one: a. 480.0 kwh b. 4.800 kwh c. 0.480 kwh d. 4800 kwh e. 48.00 kwh

Cost of Electricity A refrigerator is an appliance that is left running all the time. In New Orleans, Louisiana, the average residential electricity rate charged by Entergy is 9.82¢/kWh. Using this rate, how much will it cost to operate a refrigerator that requires 220 Watts in one month. You can use the following steps: 1. Convert power to kW = 2. Time (in hours) in one month (30 days) = %3D 3. Energy consumption (Power x Time) = 4. Cost (Rate x Energy) in dollars =

The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value. At this unit price, calculate the cost of the following. (a) Leaving a 80.0-W porch light on for 2 weeks while you are on vacation. $ 3.23 (b) Making a piece of dark toast in 3.00 min with a 860-W toaster. 0.00516 X Your response is off by a multiple of ten. (c) Drying a load of clothes in 40.0 min in a 5,800 W dryer. 0.464 X Your response is off by a multiple of ten.

Problem 2: A large household air conditioner may consume 15.5 kW of power during normal operation. What is the cost of operating this air conditioner, in dollars, 3.5 h per day for 27 d if the cost of electricity is $0.105 per kW h ? cost =