Question 7 6.25 Points SHOW YOUR WORK IN A PAPER. Hold up the first page to your webcam and select "Take Photo" to submit your work What is the current through the circuit in the figure? 16 Ω Add your answer In ger, decimal, or E notation allowed ww + 3 V ΙΩ 12 V ΙΩ Last saved 12:18:26 PM Questions Filter (19) K First < Previous Next > Last > MacBo Ee

Question 7 6.25 Points SHOW YOUR WORK IN A PAPER. Hold up the first page to your webcam and select "Take Photo" to submit your work What is the current through the circuit in the figure? 16 Ω Add your answer In ger, decimal, or E notation allowed ww + 3 V ΙΩ 12 V ΙΩ Last saved 12:18:26 PM Questions Filter (19) K First < Previous Next > Last > MacBo Ee

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter21: Circuits And Dc Instruments

Section: Chapter Questions

Problem 1PE: (a) What is the resistance often 275-O resistors connected in series? (b) In parallel?

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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?
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.
Consider the circuits shown below, (a) What is the current through each resistor in part (a)? (b) What is the current through each resistor in part (b)? (c) What is the power dissipated or consumed by each circuit? (d) What is the power supplied to each circuit?
(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.) . Six resistors, all having the same temperatures and compositions, are each attached to a battery with voltage V to form a simple circuit. The resistors have different lengths, l, but the same diameters. Rank the circuits according to the current that flows through the resistor from smallest to greatest. If two (or more) circuits have the same current flowing, give them the same ranking. Explain the rationale you used to establish your rankings. Circuit 1: l = 2 cm; V = 3 V Circuit 2: l = 2 cm; V = 6 V Circuit 3: l = 1 cm; V = 3 V Circuit 4: l = 1 cm; V = 6 V Circuit 5: l = 3cm; V = 2 V Circuit 6: l = 3cm; V = 6 V
Integrated Concepts (a) What is the cost of heating a hot tub containing 1500 kg of water from 10.0°C to 40.0°C, assuming 75.0% efficiency to account for heat transfer to the surroundings? The cost of electricity is 9 cents/kW h. (b) What current was used by the 220-V AC electric heater, if this took 4.00 h?
What is the current in milliamperes produced by the solar cells of a pocket calculator through which 4.00 C of charge passes in 4.00 h?
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How does the resistance for copper and for silicon change with temperature? Why are the behaviors of these two materials different?
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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.
Check Your Understanding Handheld calculators often use small solar cells to supply the energy required to complete the calculations needed to complete your next physics exam. The current needed to run your calculator can be as small as 0.30 mA. How long would it take for 1.00 C of charge to flow from the solar cells? Can solar cells be used, instead of batteries, to stall traditional internal combustion engines presently used in most cars and trucks?
With the switch in the circuit of Figure 27.6a open, there is no current in R2. There is current in R1, however, and it is measured with the ammeter at the right side of the circuit. If the switch is closed (Fig. 27.6b), there is current in R2. What happens to the reading on the ammeter when the switch is closed? (a) The reading increases. (b) The reading decreases. (c) The reading does not change. Figure 27.6 (Quick Quiz 27.3) What happens when the switch is closed?