A “540-W” electric heater is designed to operate from 120-V lines, (a) What is its operating resistance? (b) What current does it draw? (c) If the line voltage drops to 110 V. what power does the heater take? (Assume that the resistance is constant. Actually, it will change because of the change in temperature.) (d) The heater coils are metallic, so that the resistance of the heater decreases with decreasing temperature. If the change of resistance with temperature is taken into account, will the electrical power consumed by the heater be larger or smaller than what you calculated in part (c)? Explain.
A “540-W” electric heater is designed to operate from 120-V lines, (a) What is its operating resistance? (b) What current does it draw? (c) If the line voltage drops to 110 V. what power does the heater take? (Assume that the resistance is constant. Actually, it will change because of the change in temperature.) (d) The heater coils are metallic, so that the resistance of the heater decreases with decreasing temperature. If the change of resistance with temperature is taken into account, will the electrical power consumed by the heater be larger or smaller than what you calculated in part (c)? Explain.
A “540-W” electric heater is designed to operate from 120-V lines, (a) What is its operating resistance? (b) What current does it draw? (c) If the line voltage drops to 110 V. what power does the heater take? (Assume that the resistance is constant. Actually, it will change because of the change in temperature.) (d) The heater coils are metallic, so that the resistance of the heater decreases with decreasing temperature. If the change of resistance with temperature is taken into account, will the electrical power consumed by the heater be larger or smaller than what you calculated in part (c)? Explain.
A “540 W” electric heater is designed to operate from 120 V lines. (a) What is its operating resistance? (b) What current does it draw? (c) If the line voltage drops to 110 V, what power does the heater take? (Assume that the resistance is constant. Actually, it will change because of the change in temperature.) (d) The heater coils are metallic, so that the resistance of the heater decreases with decreasing temperature. If the change of resistancewith temperature is taken into account, will the electrical power consumed by the heater be larger or smaller than what you calculated in part (c)? Explain.
Before leaving the house in the morning, you plop some stew in your slow cooker and turn it on Low. The slow cooker has a 160 Ohm resistor and is plugged into a 120 V outlet. When you come home 8 hours later, how much charge has passed through the slow cooker circuit in that time?
A 120 volt household circuit has a 20 amp circuit breaker (maximum). A 600-Watt heater and a 60 ohm light are connected to this source in parallel:
A) What is the current through the 60 ohm light?
B) What is the resistance of the 600-Watt heater?
C) What is the minimum resistance R which could be used in parallel as a third appliance without tripping the 20 amp circuit breaker?
Chapter 25 Solutions
University Physics with Modern Physics (14th Edition)
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.
How To Solve Any Resistors In Series and Parallel Combination Circuit Problems in Physics; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=eFlJy0cPbsY;License: Standard YouTube License, CC-BY