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1. A typical incandescent reading lamp runs at 60W. If it is left on constantly, how much energy (J) is consumed per day, and what is the weekly cost if energy is charged at a rate of 12.5 cents per kilowatthour?

1. A typical incandescent reading lamp runs at 60W. If it is left on constantly, how much energy (J) is consumed per day, and what is the weekly cost if energy is charged at a rate of 12.5 cents per kilowatthour?

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter17: Resistive-inductive Series Circuits
Section: Chapter Questions
Problem 2PA: You are a journeyman electrician working in an industrial plant. Your task is to connect an inductor...
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1. A typical incandescent reading lamp runs at 60W. If it is left on constantly, how much energy (J) is consumed per day, and what is the weekly cost if energy is charged at a rate of 12.5 cents per kilowatthour? 2. Determine the time required for 4 x 1016 electrons to pass through the imaginary surface of the figure if the current is 5 mA. 3. Find the potential difference between two points in an electrical system if 60 J of energy are expended by a charge of 20 C between these two points. 3. A certain copper wire has a resistance of 25 ohms at 10°C. Take the temperature coefficient at 10°C to be 0.00409 deg/C. What must be the maximum operating temperature of the wire if its resistance is to increase by at most 20%? 4. An incandescent lamp has a tungsten filament whose resistance is 96 ohm at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source under which conditions the temperature is 24°C. 5. Determine the magnitude of the current flowing through a 4.7 kn resistor if the voltage across it is (a) 1 mV; (b) 10V; (c) 4e^-t V; (d) 100 cos(5t) V; (e) –7 V.
Transcribed Image Text:1. A typical incandescent reading lamp runs at 60W. If it is left on constantly, how much energy (J) is consumed per day, and what is the weekly cost if energy is charged at a rate of 12.5 cents per kilowatthour? 2. Determine the time required for 4 x 1016 electrons to pass through the imaginary surface of the figure if the current is 5 mA. 3. Find the potential difference between two points in an electrical system if 60 J of energy are expended by a charge of 20 C between these two points. 3. A certain copper wire has a resistance of 25 ohms at 10°C. Take the temperature coefficient at 10°C to be 0.00409 deg/C. What must be the maximum operating temperature of the wire if its resistance is to increase by at most 20%? 4. An incandescent lamp has a tungsten filament whose resistance is 96 ohm at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source under which conditions the temperature is 24°C. 5. Determine the magnitude of the current flowing through a 4.7 kn resistor if the voltage across it is (a) 1 mV; (b) 10V; (c) 4e^-t V; (d) 100 cos(5t) V; (e) –7 V.
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