How much energy is consumed by a 1.0 kW hair dryer used for 11 min?  E= How much energy is consumed by a 10 W night light left on for 13 hr? E=

A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current 4 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other small devices adding up to 8 w. All the appliances run on a voltage of 110 V. Overall Hint a. What is the total power used by the dorm room (while the refrigerator runs)? Total power used by the dorm room is W. b. Assuming that the power plant for the electricity is 10 km away and uses 00-gauge copper wire (diameter 9.266 mm), how much power is dissipated in transmission (remember to count the return wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.) Hint for part (b) Power of W is dissipated in transmission at 110 V. c. The most common way to increase the efficiency of power transmission is by using higher voltage for long-distance transmission…

I have a computer that consumes a maximum of 15 W of power and I use a 5000 mAh battery. How long will it last at maximum power draw assuming it uses 20 V.

You are given the job of evaluating potential power line systems. One system is designed to operate at V = 3000 V, and another would operate at V = 6500 V. Suppose the power line at the higher voltage would dissipate 3 % of the power that it carries. What percentage of the power would be dissipated in the low-voltage power line?

A physics student has a single-occupancy dorm room. The student has a small refrigeratorthat runs with a current of 3.00 A at a voltage of 110 V, a lamp that contains a 100-W bulb,an overhead light with a 60-W bulb, and various other small devices adding up to 3.00 W. a. Assuming the power plant that supplies 110 V electricity to the dorm is 10 km awayand the two aluminum transmission cables use 0-gauge wire with a diameter of8.252 mm, estimate the percentage of the total power supplied by the powercompany that is lost in the transmission if the power is transmitted at 110 V. Hint:treat the transmission cables as cylinders and calculate the cable’s resistance fromits length, diameter, and resistivity. b. What would be the result if the power company transmitted the electric power at110 kV?

15:  Suppose a heart defibrillator dissipates 410 J of energy in 12 ms.            What is the average power output of the defibrillator, in W?

An alternative to CFL bulbs and incandescent bulbs are light-emitting diode (LED) bulbs. A 100-W incandescent bulb can be replaced by a 16-W LED bulb.Both produce 1600 lumens of light. Assuming the cost of electricity is $0.10 per kilowatt-hour, how much does it cost to run the bulb for one year if it runs for four hours a day?