LAB 8 RC CIRCUITS Purpose You will study the behavior of a circuit with a resistor and a capacitor in series. Pre-lab Exercises These questions must be answered and turned in when you come to lab. This will help you better understand the material in the Theory section. 1. By writing the units for resistance and capacitance in base SI units, show that the time constant RC has units of seconds, as expected. 2. What is the time constant for a series RC circuit hooked up to E = 15 V when the resistance is given to be 50 kN and the capacitance is given by 4400 pF? Give your answer in microseconds (us). [Recall 1 pF = 10-12 F and 1 us = 10-6 s.] %3D %3D %3D 3. How does the time constant change if we were to halve the emf? Theory A capacitor is a device that can store electric charge. It often consists of two conducting plates arated by a small gap. When a capacitor is connected to an emf, a large current initially flows, capacitor then is that it opposes rapid changes of

LAB 8 RC CIRCUITS Purpose You will study the behavior of a circuit with a resistor and a capacitor in series. Pre-lab Exercises These questions must be answered and turned in when you come to lab. This will help you better understand the material in the Theory section. 1. By writing the units for resistance and capacitance in base SI units, show that the time constant RC has units of seconds, as expected. 2. What is the time constant for a series RC circuit hooked up to E = 15 V when the resistance is given to be 50 kN and the capacitance is given by 4400 pF? Give your answer in microseconds (us). [Recall 1 pF = 10-12 F and 1 us = 10-6 s.] %3D %3D %3D 3. How does the time constant change if we were to halve the emf? Theory A capacitor is a device that can store electric charge. It often consists of two conducting plates arated by a small gap. When a capacitor is connected to an emf, a large current initially flows, capacitor then is that it opposes rapid changes of

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter22: Electric Current

Section: Chapter Questions

Problem 65A

See similar textbooks

Similar questions

Use the orders of magnitude you found in the previous problem to answer the following questions to within an order of magnitude. (a) How many electrons would it take to equal the mass of a proton? (b) How many Earths would it take to equal the mass of the Sun? (c) How many Earth-Moon distances would it take to cover the distance from Earth to the Sun? (d) How many Moon atmospheres would it take to equal the mass of Earth’s atmosphere? (e) How many moons would it take to equal the mass of Earth? (f) How many protons would it take to equal the mass of the Sun? For the remaining questions, you need to use Figure 1.4 to obtain the necessary orders of magnitude of lengths, masses, and times.
Integrated Concepts (a) What is the average power output of a heart defibrillator that dissipates 400 J of energy in 10.0 ms? (b) Considering the high-power output, why doesn’t the defibrillator produce serious burns?
. All of the electrical outlets in a room are connected in a single parallel circuit (Figure 7.38). The circuit is equipped with a 20-A fuse, and the voltage is 120 V. (a) What is the maximum total power that can be supplied by the outlets without blowing the fuse? (b) How many 1,200-W appliances can be plugged into the sockets without blowing the fuse?
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . What is the purpose of having fuses or circuit breakers in electric circuits? How should they be connected in circuits so they will be effective?
CASE STUDY Capacitors for a Thompson coil The Thompson coil experimenters (page 829) claimed they used six identical capacitors connected in parallel. In Example 27.1, we found that the equivalent capacitance is 94 F. What is the capacitance of each capacitor?
Consider the circuit in Figure 27.17 and assume the battery has no internal resistance. (i) Just after the switch is closed, what is the current in the battery? (a) 0 (b) /2R (c) 2/R (d) /R (e) impossible to determine (ii) After a very long time, what is the current in the batten? Choose from the same choices. Figure 27.17 (Quick Quiz 27.5) How does the current vary after the switch is closed?
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . A solid metal cylinder has a certain resistance. It is then heated and carefully stretched to form a longer, thinner cylinder. After it cools, will its resistance be the same as, greater than, or less than what it was before? Explain our choice.
(a) What is the resistance often 275-O resistors connected in series? (b) In parallel?
Consider the circuit below.(a) What is the RC time constant of the circuit? (b) What is the initial current in the circuit once the switch is closed? (c) How much time passes between the instant die switch is closed and the time the current has reached half of the initial current?
Using your understanding of the nature of internal energy and temperature, explain why we might expect the resistance of a solid to increase if its temperature increases.
A 12.0-V battery-operated bottle warmer heats 50.0 g of glass, 2.50102 g of baby formula, and 2.00102 g of aluminum from 20.0C to 90.0C . (a) How much charge is moved by the battery? (b) How many electrons per second flow if it takes 5.00 min to warm the formula? (Hint: Assume that the specific heat of baby formula is about the same as the specific heat of water.)
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.