The RC charging circuit in a camera flash unit has a voltage source of 265 V and a capacitance of 141 µF. HINT (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 16.7 s. Q (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.44 ms.
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- (a) What is the terminal voltage (in V) of a large 1.90 V carbon-zinc dry cell used in a physics lab to supply 1.20 A to a circuit, if the cell's internal resistance is 0.200 Q? V (b) How much electrical power (in W) does the cell produce? W (c) What power (in W) goes to its load? Wa) What is the terminal voltage (in V) of a large 1.35 V carbon-zinc dry cell used in a physics lab to supply 1.80 A to a circuit, if the cell's internal resistance is 0.300 Ω? b) How much electrical power (in W) does the cell produce? and c) What power (in W) goes to its load?Consider the circuit shown that has two resistors (each with resistance R = 8.00 Q), a battery with negligible internal resistance (V= 12.0 V), and a lightbulb. If the resistance of the lightbulb is 3.50 Q, calculate the power output of the lightbulb (ie. the rate at which energy is dissipated in the lightbulb). R R 12 W 2.2 W 6.8 W 4.0 W
- A RC circuit is constructed with a (initially uncharged) 5.00-µF capacitor and a 5.00- ohm resistor, which are connected in series to an ideal battery with emf 60.0 V. At a certain time after the circuit is connected, it is found that heat is being produced in the resistor at a rate of 300 W. How much energy is stored in the capacitor at that time (in Joules)? O None of these 1.8x104 1.13x10-3 3.75x10-3 9x10-3Consider an initially uncharged capacitor in an RC circuit. The resistance is 25,957 Ohms and the capacitance is 555 x 10^-6 F. If the source potential being used to charge the capacitor is 14.8 V, how long after charging begins will the energy stored by the capacitor be 65.5% of its maximum value.Consider an initially uncharged capacitor in an RC circuit. The resistance is 20,000 Ohms and the capacitance is 500 x10• F. If the source potential being used to charge the capacitor is 15 V, how long after charging begins will the power delivered to the resistor be 25 % of its maximum value?
- An ECG monitor must have a time constant less than 100 microsecond to be able to measure variations in voltage over small time intervals. If the resistance of the circuit (due mostly to that of the patient’s chest) is 1000 Ohms, what is the maximum capacitance of the circuit? Please submit your answer in units of nanoFarad (nF).The duration of a photographic flash is related to an RC time constant, which is 0.12 us during the flash discharge for a certain camera. td = 0.12 us R = 0.048 ohm (a) If the resistance of the flash lamp is 0.048 ohm during discharge, what is the size of the capacitor supplying its energy in uF? (b) What is the time constant for charging the capacitor, if the charging resistance is 800.0 kOhm in s?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: