A 40 W light bulb is connected to the 220 V mains supply. Assuming that the bulb runs at its rated power, what is its resistance (in Ω) ?
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A 40 W light bulb is connected to the 220 V mains supply. Assuming that the bulb runs at its rated power, what is its resistance (in Ω) ?
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- A loop circuit has a resistance of R1 and acurrent of 1.8 A. The current is reduced to1.5 A when an additional 2.8 Ω resistor isadded in series with R1.What is the value of R1? Assume the internal resistance of the source of emf is zero.Answer in units of Ω.15.0-Ω resistor and a 35.0-Ω resistor in series are connected to a 120-V dc source. (a) What is (are) the current(s) through the resistors? (b) What is the voltage drop across each resistor?In the circuit diagram R1 = 5R and R2 = 15R, where R = 14 Ω. The power dissipated in resistor 2 is P = 1.6 W. Part (a) What is the voltage across the battery in volts? Part (b) How much power, Ps, is the source supplying, in watts?
- In a certain stereo system, each speaker has a resistance of 5.00 Ω. The system is rated at 55.2 W in each channel. Each speaker circuit includes a fuse rated at a maximum current of 4.50 A. Is this system adequately protected against overload? Yes/No Give the current drawn by each speaker to support your answer.An idealized voltmeter is connected across the terminals of a 15.5 V battery, and a 71.0 Ω appliance is also connected across its terminals. If the voltmeter reads 10.6 V. How much power is being dissipated by the appliance? What is the internal resistance of the battery?A 530-Ω resistor, an uncharged 3.40-μF capacitor, and a 4.80-V emf source are connected in series. What is the instantaneous power to the capacitor after 3 time constants? Calculate your answer in the units of milli-watts (mW). Hint: Instantaneous power is the product of instantaneous potential drop and instantaneous current. Write your answer in decimal form with three digits to the right of the decimal point (e.g. 5.389); do not write any units.
- Your cell phone typically consumes about 410 mW of power when you text a friend. If the phone is operated using a lithium-ion battery with a voltage of 3.7 V, what is the current (in A) flowing through the cell-phone circuitry under these circumstances?A capacitor, C, is (fully) charged by connecting it to a 7 Volt EMF and then is allowed to dischargethrough a 2 Ω resistor as shown in the Figure. What is the current, I, in the circuit (in A) when thestored energy in the capacitor has dropped to 30% of its initial value?A 1.5-V emf source has an internal resistance of 0.50 Ω. After it has been connected to a load with a resistance R, the terminal voltage dropped to 1.45 V.How much current is passing through the circuit
- A heart defibrillator being used on a patient has an RC time constant of 11.0 ms due to the resistance of the patient and the capacitance of the defibrillator. If the defibrillator has an 7.25 µF capacitance, what is the resistance of the path through the patient? resistance: Ω If the initial voltage is 12.0 kV, how long does it take to decline to 323 V? time: Question Credit: OpenStax College PhysicsIn an experiment on muscle a voltage of 6.64 V is applied, resulting in a current of 57.1 mA. What is the resistance of this muscle, in Ω? What voltage is needed to supply 593 mW of power to a 2.64 kΩ resistor?A heart defibrillator being used on a patient has an RC time constant of 11.0 ms due to the resistance of the patient and the capacitance of the defibrillator. If the defibrillator has an 9.25 µF capacitance, what is the resistance of the path through the patient? resistance: Ω If the initial voltage is 12.0 kV, how long does it take to decline to 895 V? time: