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- A young man owns a canister vacuum cleaner marked 535 W [at] 120 V and a Volkswagen Beetle, which he wishes to clean. He parks the car in his apartment parking lot and uses an inexpensive extension cord 15.0 m long to plug in the vacuum cleaner. You may assume the cleaner has constant resistance, (a) If the resistance of each of the two conductors in the extension cord is 0.900 , what is the actual power delivered to the cleaner? (b) If instead the power is to be at least 525 W, what must be the diameter of each of two identical copper conductors in the cord he buys? (c) Repeat part (b) assuming the power is to be at least 532 W.(a) What is the resistance of a 220-V AC short circuit that generates a peak power of 96.8 kW? (b) What would the average power be if the average power be if the voltage was 120 V AC?Consider the circuit below, (a) What is the initial current through resistor R2? when the switch is closed? (b) What is die current through resistor R2 when the capacitor is fully charged, long after die switch is closed? (c) What happens if the switch is opened after it has been closed for some rime? (d) If the switch has been closed for a time period long enough for the capacitor to become fully charged, and then the switch is opened, how long before the current through resistor R1 reaches half of its initial value?
- Two different electrical devices have the same power consumption, but one is meant to be operated on 12G-V AC and the other on 240-V AC. (a) What is the ratio of their resistances? (b) What is the ratio of their currents? (c) Assuming its resistance is unaffected, by what factor will the power increase if a 120-V AC device is connected to 240-V AC?(a) What is the resistance of a 220-V ac short circuit that generates a peak power of 96.8 kW? (b) What would the average power be if the voltage were 120 V ac?(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 small office-building air conditioner operates or 408-V AC and consumes 50.0 kW. (a) What is its effective resistance? (b) What is the cost of running the air conditioner during a hot summer month when it is on 8.00 h per day for 30 days and electricity costs 9.00 cenls/kW h ?Integrated Concepts If you wish to take a picture of a bullet traveling at 500 m/s, then a very brief flash of light produced by an RC discharge through a flash tube can limit blurring. Assuming 1.00 mm of motion during one RC constant is acceptable, and given that the flash is driven by a 600F capacitor, what is the resistance in the flash tube?3. Four capacitors are connected to an EMF as shown with C₂ = 20 μF, C₂ = 4 μF, C₂ = 3 μF, and C₁ = 4 μF. The voltage across C₂ is 20 V. a. What is the equivalent capacitance of the circuit? Redraw circuit at each step. b. What is the EMF? You may (but do not need to) make a table similar to the first problem to help organize your calculation. W B C₁ C₂ C₂ CA
- 1. In the circuit shown in the figure, R1 = R2 = 2kN, C1 = 500µF, C2 = 1000µF, 50V. Capacitors have no charge at t=0 when switch S is set to position A. R1 S. C3 = 1000µF, and E = C2 R2 a) Find the current through the power supply ww at t=0. b) Find the time constant of the circuit. c) When the capacitors are fully charged, find the potential difference between the plates of C2.3. Four capacitors are connected to an EMF as shown with C₂ = 20 μF, C₂ = 4 μF, C₂ = 3 μF, and C₁ = 4 μF. The voltage across C₂ is 20 V. a. What is the equivalent capacitance of the circuit? Redraw circuit at each step. b. What is the EMF? You may (but do not need to) make a table similar to the first problem to help organize your calculation. B d. What is the total energy stored in the capacitors? Do it the easy way! to C₂ c. What would a voltmeter read if the COM lead is at A and the V lead is at B? In other words, what is VB - V₁? C413. In the circuit segment below, all internal resistances are r= 2 o and all other resis- tances are R = 27 a. The EMFS are §, = 720 v, 5 = 240 v and 5 = 360 v. R. R. ь If the current coming into point (a) is I = 2.4 amps then what is the potential dif- ference V, (i.e. V, - V) across the points (a) and (b)? (in volts) a. + 744 b. + 696 c. + 456 d. + 984 e. + 216
