The resistance of a bagel toaster is 12 Q. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster?
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- The heating element of a coffeemaker operates at 120 V and carries a current of 4.50 A. Assuming the water absorbs all of the energy converted by the resistor, calculate how long it takes to heat 0.715 kg of water from room temperature (23.0°C) to the boiling point. min> 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. (The resistance of an electric heater is 90 Ω when connected to 120 V. How much energy does it use during 20 min of operation?
- Consider the network of four resistors shown in the diagram, where R1 = 1 Ω, R2 = 5 Ω, R3 =2Ω,andR4 =6Ω. . The resistors are connected to a battery with an emf V. (a) What is the current flowing out of the battery if the emf is 12 V? (B) What is the voltage difference across the resistor R1? (C) What is the rate of Ohmic dissipation for resistor R2?#2060 W 30 W Bulb A Bulb B V,-120V Vs-120V PA-60W Pa-30w Light bulb A has a power rating of 60 W when plugged into a 120 v outlet. Bulb B has a power rating of 30W when plugged into the same 120V outlet. Which of the following are correct statements? SELECT TWO ANSWERS a. Bulb A has twice the resistance of bulb B b. The following equation relates the current through each bulb la = 218 c. If both bulbs were turned on for 5 minutes bulb B would use twice the energy of bulb A O d. Bulb A has half the resistance of bulb B
- 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?The resistance of a bagel toaster is 11 Ω. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster?