Problem 7: Why do lights dim when a large appliance is switched on? The answer is that the large current the appliance motor draws causes a significant potential drop in the wires and reduces the voltage across the lights. This is called an IR drop because it is simply due to the current and resistance of the device in question. -Refrigerator Low P. Bulb dims R wire resistance Low R large /, R ww Motor Part (a) Assume the bulb in question dissipates P2 = 75 W when connected to the 120 V AC source. What average power will the bulb dissipate if I = 13.5 A passes through the wires when the motor comes on? Assume a negligible change in bulb resistance, while the resistance of the wires are R1 = 0.55 Q. Numeric : A numeric value is expected and not an expression. P2' = Part (b) How much power, P3, in watts, is consumed on average by the motor? Numeric : A numeric value is expected and not an expression. P3 =

Problem 7: Why do lights dim when a large appliance is switched on? The answer is that the large current the appliance motor draws causes a significant potential drop in the wires and reduces the voltage across the lights. This is called an IR drop because it is simply due to the current and resistance of the device in question. -Refrigerator Low P. Bulb dims R wire resistance Low R large /, R ww Motor Part (a) Assume the bulb in question dissipates P2 = 75 W when connected to the 120 V AC source. What average power will the bulb dissipate if I = 13.5 A passes through the wires when the motor comes on? Assume a negligible change in bulb resistance, while the resistance of the wires are R1 = 0.55 Q. Numeric : A numeric value is expected and not an expression. P2' = Part (b) How much power, P3, in watts, is consumed on average by the motor? Numeric : A numeric value is expected and not an expression. P3 =

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.81AP: The potential difference across the filament of a light-bulb is maintained at a constant value while...

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