The RC charging circuit in a camera flash unit has a voltage source of 255 V and a capacitance of 116 µF. HINT (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 16.2 s. Ω (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.34 ms. A

The RC charging circuit in a camera flash unit has a voltage source of 255 V and a capacitance of 116 µF. HINT (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 16.2 s. Ω (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.34 ms. A

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 55P: An ECG monitor must have an KC time constant lessthan 1.00102s to be able to measure variations...

See similar textbooks

Related questions

Q: A battery with emf, ε = 15 V, has a terminal voltage of 12.8 V when it is delivering 18.5 W of power…

Q: A simple RC circuit consists of a 1-μF capacitor in series with a 3000-Ω resistor, a 6-V battery,…

Q: A small circuit consists of a resistor in series with a capacitor, as shown. The capacitor stores…

A: Given data: Energy U = 23.7 mJ Voltage Vbat = 32.0 V Time spent in half discharge of capacitor t =…

Q: A 2.5-F capacitor is charged to 12 V and then discharged through a 4.8 Ω resistor. What will be the…

Q: In a heart pacemaker, a pulse is delivered to the heart 81 times per minute. The capacitor that…

A: Given data The rate of the pulse delivered is η = 81 times/min The magnitude of the resistance is R…

Q: A 15.7 μF capacitor initially charged to 41.0 μC is discharged through a 1.30 kΩ resistor. How long…

A: Required timet = 0.01414 s t = 14.14 ms Explanation:

Q: A 15.0 μF capacitor initially charged to 23.5 μC is discharged through a 3.50 kΩ resistor. How long…

A: When a charged capacitor is conneted to the resistance and also form a closed loop then the current…

Q: A lamp in a child's Halloween costume flashes based on an RC discharge of a capacitor through its…

A: Given : t = 0.250 s P = 0.520 W V = 3 V

Q: Changing the thickness of the myelin sheath surrounding an axon changes its capacitance and thus the…

A: R=Resistance=25 MΩd=Gap=1 mmv=Velocity=55 m/s

Q: A charging RC circuit controls the intermittent windshield wipers in a car. The emf is 12.0 V. The…

Q: A resistor with resistance 31.5 Q is connected to the terminals of a voltage source. (a) Calculate…

A: recall V=IR P=i2R

Q: A series RC circuit consists of a resistor, a capacitor that is initially uncharged, a battery, and…

A: Given: The supply voltage is 16 V. The voltage across the capacitor at 6 s is 2 V.

Q: The RC charging circuit in a camera flash unit has a voltage source of 285 V and a capacitance of…

Q: A charged capacitor is connected to a resistor and a switch as in the figure below. The circuit has…

Q: Consider an initially uncharged capacitor in an RC circuit. The resistance is 25,957 Ohms and the…

A: R = 25957 ohm C = 555×10-6 F V = 14.8 volts

Question

100%

The RC charging circuit in a camera flash unit has a voltage source of 255 V and a capacitance of 116 μF.

(a) Find its resistance \( R \) (in ohms) if the capacitor charges to 90.0% of its final value in 16.2 s.

[Input box] Ω

(b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.34 ms.

[Input box] A

Note: There is a "HINT" button next to the problem statement, indicating possible additional guidance or formulae for solving the problem.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.

Similar questions

A flashing lamp in a Christmas earring is based on an RC discharge of a capacitor through its resistance. The effective duration of the flash is 0.250 s, during which it produces an average 0.500 W from an average 3.00 V. (a) What energy does it dissipate? (b) How much charge moves through the lamp? (c) Find the capacitance, (d) What is the resistance of the lamp? (Since average values are given for some quantities, the shape of the pulse profile is not needed.)
Consider a circuit that consists of a real battery with an emf and an internal resistance of r connected to a variable resistor R. (a) In order for the terminal voltage of the battery to be equal to the emf of the battery, what should the resistance of the variable resistor be adjusted to? (b) In older to get the maximum current from the battery, what should the resistance variable resistor be adjusted to? (c) In order for the maximum power output of the battery to be reached, what should the resistance of the variable resistor be set to?
A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering 20.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?
A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. (a) What is the battery’s internal resistance? (b) What power is dissipated inside the battery? (c) At what rate (in °C/min ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.300 kcal/kg • °C, assuming no heat escapes?
A homemade capacitor is constructed of 2 sheets of aluminum foil with an area of 2.00 square meters, separated by paper, 0.05 mm thick, of the same area and a dielectric constant of 3.7. The homemade capacitor is connected in series with a 100,00- resistor, a switch, and a 6.00-V voltage source, (a) What is the RC time constant of the circuit? (b) What is the initial current through the circuit, when the switch is closed? (c) How long does it take the current to reach one third of its initial value?
A 160F capacitor charged to 450 V is dischargedthrough a 31.2k resistor, (a) Find the time constant.(b)Calculate the temperature increase of the resistor, given that its mass is 2.50 g and its specific heat is 1.67kJ/kg °C,noting that most of the thermal energy is retained in the short time of the discharge, (c) Calculate the new resistance, assuming it is pure carbon. (d) Does this change in resistance seem significant?
A 1,00-?O voltmeter is placed in parallel with a 75.0kresistor in a circuit, (a) Draw a circuit diagram of the connection, (b) What is the resistance of the combination? If the voltage across the combination is kept the same as it was across the 75.0-kresistor alone, what is the percent increase in current? (d) If the current through the combination is kept the same as it was through the 75.0-kresistor alone, what is the percentage decrease in voltage? (e) Are the changes found in parts (c) and (d) significant? Discuss.
A child's electronic toy is supplied by three 1.58-V alkaline cells having internal resistances of 0.0200 inseries with a 1.53-V carbon-zinc dry cell having a 0.100- internal resistance. The load resistance is 10.0 . (a) Draw a circuit diagram of the toy and itsbatteries, (b) What current flows? (c) How much power is supplied to the load? (d) What is the internal resistance of the dry cell if it goes bad, resulting in only 0.500 W being supplied to the load?
An automobile starter motor has an equivalent resistance of 0.0500 and is supplied by a 12.0-V battery with a 0.0100- internal resistance, (a) What is thecurrent to the motor? (b) What voltage is applied to it? (c) What power is supplied to the motor? (d) Repeat these calculations for when the battery connections are corroded and add 0.0900 to the circuit. (Significant problems are caused by even small amounts of unwanted resistance in low-voltage, high-current applications.)
A student makes a homemade resistor from a graphite pencil 5.00 cm long, where the graphite is 0.05 mm indiameter. The resistivity of the graphite is =1.38102/m . The homemade resistor is place inseries with a switch, a 10.00-mF capacitor and a 0.50-V power source, (a) What is the BC time constant of the circuit? (b) What is the potential drop across the pencil 1.00 s after the switch is closed?
A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?
(a) During surgery, a current as small as 20.0A applied directly to the heart may cause ventricular fibrillation. If the resistance of the exposed heart is 300 what is the smallest voltage that poses thisdanger? (b) Does your answer imply that special electrical safetyprecautions are needed?