(a) A well-insulated electric water heater warms 125 kg of water from 20.0°C to 53.0°C in 33.0 min. Find the resistance (in Q2) of its heating element, which is connected across a 240 V potential difference. Ω (b) What If? How much additional time (in min) would it take the heater to raise the temperature of the water from 53.0°C to 100°C? min (c) What would be the total amount of time (in min) required to evaporate all of the water in the heater starting from 20.0°C? min
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- Example 14. This question concerns an engineer investigating a faulty 10 underground electric cable. The underground cable consists of two parallel wires each of length L = 1.750 km. At a distance d from terminals 1 and 2 it develops a fault which is characterised by a resistance _Ry between the lines as 20 represented in ſigure. The resistance measured between terminals 1 and 2 is R, = 415.0n and the resistance measured between terminals 3 and 4 is R2 = 430.52 Terminals 3 and 4 are then connected by a wire of negligible resistance. The measured resistance between terminals 1 and 2 now becomes R3 = 45.52 (a) Obtain a value for the resistance R of the total length, 2L, of lines assuming Rx >> R. (b) Hence calculate the values of d and Ry. (c) Make an estimate of the inaccuracy (an appropriate per cent) introduced by the assumption used in (a). The lines of the cable lie in the ground one above the other with a vertical separation of 0.010 m. The upper line is 0.5 m below the surface of…Consider the circuit shown in the figure below. (Assume R₁ = 14.0 and R₂ = 7.50 .) b 25.0 V R₁ R₁ Submit Answer a R₂ (b) Find the current in the 20.0-0 resistor. A R₂ C (a) Find the potential difference between points a and b. V 20.0 Ω ℗Lightbulb A is marked "10.0 W 120 V," and lightbulb B is marked "60.0 W 120 V." These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120-V source. (a) In what time interval does 1.60 J pass into lightbulb A?(b) By what mechanisms does this energy enter and exit the lightbulb? Explain. (c) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at $0.110 per kWh.
- > Lightbulb A is marked "60.0 W 120 V," and lightbulb B is marked "100 W 120 V." These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120-V source. (a) Find the resistance of each lightbulb. Ω RA RB Ω = (b) During what time interval does 1.20 C pass into lightbulb A? S (c) Is this charge different upon its exit versus its entry into the lightbulb? Yes No Explain. This answer has not been graded yet. (d) In what time interval does 1.40 J pass into lightbulb A? S (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. This answer has not been graded yet. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at $0.110 per kWh. (A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.92 Ω. (a) Calculate the power (in W) consumed by the heater. W (b) How many minutes would it take to heat 1.13 kg of coffee from 20.6°C to 46.2°C with this heater? Coffee has a specific heat of 4184 J (kg · °C) . Neglect any energy losses to the environment. minIn the figure R₁ = 6.770, R₂ = 20.3 02, and the ideal battery has emf & = 10.2 V. (a) What is the magnitude of current i₁? (b) How much energy is dissipated by all four resistors in 2.06 min? 40 ww R₁ Units Units E 8 R₂ 11 R₂ ww (a) Number (b) Number i R₂
- Q10 pls help with correct answerGiant electric eels can deliver a voltage shock of 5.00×102 V and up to 1.00 A of current for a brief time. What is the maximum power a giant electric eel can deliver to its prey during this time? maximum power: W The body of a snorkeler swimming in salt water has a resistance of about 605 Ω. If the snorkeler is unfortunate enough to be struck by the eel, what current will flow through her body? current: A A current of about 500 mA can cause heart fibrillation and death if it lasts too long. Is the current through the swimmer in this case large enough to be dangerous? yes no What power does the snorkeler receive from the eel? power:In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States. Therefore a "100 W" European bulb would be intended for use with a 220 V potential difference. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Increasing the resistance. ▼ If you bring a "100 W" European bulb home to the United States, what should be its U.S. power rating? Express your answer to three significant figures and include the appropriate units. P = Submit Part B Value I = Request Answer Units How much current will the 100 W European bulb draw in normal use in the United States? Express your answer to three significant figures and include the appropriate units. Value Units ? wwwww ?
- Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 7.3m. Conductor B is a hollow tube of inside diameter 4.5m and outside diameter 13.1m. The ratio of their resistance, Ra/Rg, is Select one: O 0.3521 O 2.8403 O 1.1781 O 0.0159 O Not GivenIn (Figure 1), R1R1R_1 = 3.00 ΩΩ, R2R2R_2 = 7.00 ΩΩ, and R3R3R_3 = 4.00 ΩΩ. The battery has negligible internal resistance. The current I2I2 through R2R2 is 3.00 A . What is the emf of the battery? Express your answer with the appropriate units.Lightning is a spectacular example of electric current in a natural phenomenon. There is much variability to lightning bolts, but a typical event can transfer 10^9 J of energy across a potential difference of perhaps 5 x 10^7 V during a time interval of about 0.2 s. Use this information to estimate (a) the total amount of charge transferred between cloud and ground (b) the current in the lightning bolt (c) the average power delivered over the 0.2 s.