4. There are approximately 20.1 million households that use TVs in the Philippines. On the average, each TV uses 75 W of power and is turned on for 8.0 hours a day. If the electrical energy costs 8.75 PHP per kWh, how much money is spent every day in keeping 20.1 million TVs turned on? a. 105.5 M b. 206.6 М с. 307.7 М d. 408.8 M

4. There are approximately 20.1 million households that use TVs in the Philippines. On the average, each TV uses 75 W of power and is turned on for 8.0 hours a day. If the electrical energy costs 8.75 PHP per kWh, how much money is spent every day in keeping 20.1 million TVs turned on? a. 105.5 M b. 206.6 М с. 307.7 М d. 408.8 M

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 66PE: Integrated Concepts (a) An aluminum power transmission line has a resistance of 0.0580/km. What is...

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Unreasonable Results (a) What current is needed to transmit 1.00 102MW of power at 480 V? (b) What power is dissipated by the transmission lines if they have a 1.00 -resistance? (c) What is unreasonable about this result? (d) Which assumptions are unreasonable, or which premises are inconsistent?
A 1500 W microwave oven runs off of a 240 V supply. The current drawn is by the microwave is 6.25Amps a) If the electricity cost is $0.0925 per kWh, how much does it cost to run the microwave for 5 min?
A light rail commuter train draws 645 A of 590 V DC electricity when accelerating. A.What is its power consumption rate in kilowatts? B.How long does it take to reach 30.0 m/s starting from rest if its loaded mass is 4.50 104 kg, assuming 91.0% efficiency and constant power? Find its average acceleration. C.What is the ratio of the acceleration you found for the light rail train compares to what might be typical for an automobile?
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The generator at a large power plant has an output of 1,800,000 W at 30,000 V. a. If it were a DC generator, what would be the current in it ? b. What is its energy output each day in kilowatt-hours ?
A physics student likes to study while listening to loud music. If electricity costs 12.00$/kWh (kilowatt-hour), how much would it cost the student to run a 220 W stereo system 8.0 hours per day for 10 days of studying? (in dollars)
A cauterizer, used to stop bleeding in surgery, puts out 2.00 mA at 15.0 kV. (a) What is its power output? (b) What is the resistance of the path?
(a) What is the resistance of a light bulb that uses an average power of 75.0 W when connected to a 60.0-Hz power source having a maximum voltage of 170. V? (b) What is the resistance of a 100.-W lightbulb?
(a) What is the resistance of a lightbulb that uses an average power of 75.0 W when connected to a 60.0-Hz power source having a maximum voltage of 170 V? (b) What If? What is the resistance of a 100-W lightbulb?
Integrated Concepts (a) Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 750-kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 2.00 102-m- high hill in 2.00 min at a constant 25.0-m/s speed while exerting 5.00 102 N of force to overcome air resistance and friction? (c) To travel at a constant 25.0-m/s speed, exerting a 5.00 102 N force to overcome air resistance and friction? See Figure 20.44.
Integrated Concepts A light-rail commuter train draws 630 A of 650-V DC electricity when accelerating, (a) What is its power consumption rate in kilowatts? (b) How long does it take to reach 20.0 m/s stalling from rest if its loaded mass is 5.30 1()4 kg, assuming 95.0% efficiency and constant power? (c) Find its average acceleration. (d) Discuss how the acceleration you found for the light-rail train compares to what might be typical for an automobile.
Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?