A 140 W lightbulb is plugged into a standard 120 V outlet. (a) How much does it cost in dollars per 31-day month to leave the light turned on continuously? Assume electrical energy costs US$ 0.06/kW · h. (b) What is the resistance of the bulb? (c) What is the current in the bulb? (a) Number i Units (b) Number i Units (c) Number i Units
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- A heart defibrillator being used on a patient has an RC time constant of 21.0 ms due to the resistance of the patient and the capacitance of the defibrillator. If the defibrillator has an 9.00 µF capacitance, what is the resistance of the path through the patient? resistance: If the initial voltage is 12.0 kV, how long does it take to decline to 687 V? time: SIn (Figure 1) the battery has emf 45.0 V and negligible internal resistance. R₁ = 7.00 2. The current through R₁ is 1.50 A and the current through R3 = 4.50 A. Figure ww R₁ www R₂ www- R₂ < 1 of 1 ▼ What is the resistance R₂? Express your answer with the appropriate units. R₂: Submit Part B R3 11 .0 Submit μA Value What is the resistance R3 ? Express your answer with the appropriate units. Request Answer HÅ Value Units Request Answer Units ?Three identical 100.0-W, 120-V lightbulbs are connected across a 120-V power source as shown in in the figure below. Assume that the resistance of each bulb is constant (even though in reality the resistance increases markedly with current). 120 V R₁ R₂ (a) Find the total power supplied by the power source. W = (b) Find the potential difference across each lightbulb. AV₁ AV₂ = AV₂ = Need Help? Read It R₂ V Master It
- A charged capacitor is connected to a resistor and a switch as in the figure below. The circuit has a time constant of 2.45 s. Soon after the switch is closed, the charge on the capacitor is 50.0% of its initial charge. + Q те R (a) Find the time interval required for the capacitor to reach this charge. S (b) If R = 230 k, what is the value of C? C = μFIn the figure circuit section AB absorbs energy at a rate of 55 W when current i 0.90 A through it is in the indicated direction. Resistance R = 2.0 Q. (a) What is the potential difference between A and B? Emf device X lacks internal resistance. (b) What is its emf? R (a) Number i Units (b) Number i Units60 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
- A student in the laboratory connects a 17 Ω resistor, a 26 Ω resistor, and a 34 Ω resistor in parallel and then connects the arrangement to a 46 V dc source. (a) What is the current? A(b) What is the power? WTwo resistors are connected in series in a circuit with a battery. The electromotive force (emf) of the battery is 3.0 volts. The resistances are 0.40 ohms and 1.85 ohms. (a) Determine the current I. Hint: The same current flows through both resistors. The voltage drop across the two resistors, i.e. IR₁ ✈ IR₂, is equal to the emf. (d) Determine the power in the first resistor. 1.78 W (e) Determine the power in the second resistor. 2.49 WA 120 volt household circuit has a 20 amp circuit breaker (maximum). A 600-Watt heater and a 60 ohm light are connected to this source in parallel: A) What is the current through the 60 ohm light? B) What is the resistance of the 600-Watt heater? C) What is the minimum resistance R which could be used in parallel as a third appliance without tripping the 20 amp circuit breaker?
- (a) Find the equivalent resistance of the circuit in Figure P18.8. (R1 = 4.00 2, R2 = 15.0 2) (b) If the total power supplied to the circuit is 2.00 W, find the emf of the battery. R2 4.00 2 5.00 N R, R, Figure P18.8The cord from an appliance is too short to reach the wall outlet in your room. You have two extension cords to choose from. a) Find the voltage drop in the first extension cord having a 0.0780 Ω resistance and through which 7.60 A is flowing. b)The second extension cord is cheaper and utilizes thinner wire. It has a resistance of 0.780 Ω and the current flowing through it is 7.60 A. By what amount does the voltage supplied to the appliance change when the first extension cord is replaced by the second?