COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 66QAP
To determine
Power consumed by the bulbs if they are connected in a sereis across same source of voltage.
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94 Figure 27-79 shows three 20.0 2
resistors. Find the equivalent resist-
ance between points (a) A and B, (b)
A and C, and (c) B and C. (Hint: A
Imagine that a battery is connected
between a given pair of points.)
Figure 27-79 Problem 94.
A 58 F capacitor and a 471
resistor are connected to a battery of voltage
7 V as shown in the circuit. After closing the switch, when the capacitor
voltage is half of battery voltage how much energy is stored in the
capacitor? Express your answer in Joules (J)
E
41-
7
C
R
*62 Figure 27-64 shows the circuit of
a flashing lamp, like those attached to
barrels at highway construction sites.
The fluorescent lamp L (of negligible
capacitance) is connected in parallel
across the capacitor C of an RC circuit.
There is a current through the lamp
only when the potential difference
across it reaches the breakdown volt-
Figure 27-64
Problem 62.
age V1; then the capacitor discharges completely through the lamp
and the lamp flashes briefly. For a lamp with breakdown voltage
VL = 72.0 V, wired to a 95.0 V ideal battery and a 0.150 µF capacitor,
what resistance Ris needed for two flashes per second?
Chapter 18 Solutions
COLLEGE PHYSICS
Ch. 18 - Prob. 1QAPCh. 18 - Prob. 2QAPCh. 18 - Prob. 3QAPCh. 18 - Prob. 4QAPCh. 18 - Prob. 5QAPCh. 18 - Prob. 6QAPCh. 18 - Prob. 7QAPCh. 18 - Prob. 8QAPCh. 18 - Prob. 9QAPCh. 18 - Prob. 10QAP
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- Lightbulb A is marked 25.0 W 120. V, and lightbulb B is marked 100. W 120. V. These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120.-V source. (a) Find the resistance of each lightbulb. (b) During what time interval does 1.00 C pass into lightbulb A? (c) Is this charge different upon its exit versus its entry into the lightbulb? Explain. (d) In what time interval does 1.00 J pass into lightbulb A? (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at 0.110 per kWh.arrow_forwardDraw two graphs of charge versus time on a capacitor. Draw one for charging an initially uncharged capacitor in series with a resistor, as in the circuit in Figure 21.38, starting from t = 0. Draw the other for discharging a capacitor through a resistor, as in the circuit in Figure 21.39, starting at t = 0, with an initial charge Q0. Show at least two intervals of t.arrow_forwardWhen resistors with different resistances are connected in parallel, which of the following must be the same for each resistor? Choose all correct answers, (a) potential difference (b) current (c) power delivered (d) charge entering each resistor in a given time interval (e) none of those answersarrow_forward
- Figure 21.55 shows how a bleeder resistor is used to discharge a capacitor after an electronic device is shut off allowing a person to work on the electronics with less risk of shock, (a) What is the time constant? (b) How long will it take to reduce the voltage on the capacitor to 0.250% (5% of 5%) of its full value once discharge begins? (c) If the capacitor is charged to a voltage V0through a 100-O resistance, calculate the time it takes to rise to 0.865V0(This is about two time constants.)arrow_forwardConsider the circuit shown in Figure P26.24, where C1, = 6.00 F, C2 = 3.00 F. and V = 20.0 V. Capacitor C1 is first charged by closing switch S1. Switch S1 is then opened, and the charged capacitor is connected to the uncharged capacitor by closing Calculate (a) the initial charge acquired by C, and (b) the final charge on each capacitor.arrow_forwardA heart defibrillator being used on a patient has an RC time constant of 10.0 ms due to the resistance of the patient and the capacitance of the defibrillator. (a) If the defibrillator has an 8.00F capacitance, what is the resistance of the path through the patient? (You may neglect the capacitance of the patient and the resistance of the defibrillator.) (b) If the initial voltage is 12.0 kV, how long does it take to decline to 6.00x102 V?arrow_forward
- An uncharged series RC circuit is to be connected across a battery. For each of the following changes, determine whether the time for the capacitor to reach 90% of its final charge would increase, decrease, or remain unchanged. Indicate your answers with I, D, or U, respectively. (a) The RC time constant is doubled. (b) The battery voltage is doubled. (c) A second resistor is added in series with the original resistor.arrow_forwardSome camera flashes use flash tubes that requite a high voltage. They obtain a high voltage by charging capacitors in parallel and then internally changing the connections of the capacitors to place diem in series. Consider a circuit that uses four AAA batteries connected in series to charge six 10-mF capacitors through an equivalent resistance of 100 . The connections are thenswitched internally to place the capacitors in series. The capacitors discharge through a lamp with a resistance of 100 . (a) What is the RC time constant and the initialcurrent out of the batteries while they are connected in parallel? (b) How long does it take for the capacitors to charge to 90% of the terminal voltages of the batteries? (c) What is the RC time constant and the initial current of the capacitors connected in series assuming it discharges at 90% of full charge? (d) How long does it rake the current to decrease to 10% of the initial value?arrow_forwardFigure 19–44 shows three identical bulbs in a circuit. What happens to the brightness of bulb A if you replace bulb B with a short circuit? A (a) Bulb A gets brighter. (b) Bulb A gets dimmer. (c) Bulb A's brightness does not change. (d) Bulb A goes out. C FIGURE 19-44 B MisConceptual Question 6. Varrow_forward
- What is the overall energy stored in microjoules (µJ) within the capacitors in the circuit depicted in the image?arrow_forwardFor the circuit shown below. (M- mega - 100:u- micro -10) S1 1M Ohm Vs 20 V 4.7 uF The capacitor voltage after 10 s isarrow_forward50544 Chapter 19 Ho ates > Chapter 19 Homework O Resources A doubly ionized molecule (i.e., a molecule lacking two electrons) moving in a magnetic field experiences a magnetic force of 5.89 x 10-16 N as it moves at 229 m/s at 77.1° to the direction of the field. Find the magnitude of the magnetic field. ofarrow_forward
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