A lightbulb is rated at 75 W when connected to 120 V. (a) What current flows through the bulb in this case? A (b) What is the bulb's resistance? Ω (c) What would be the current in the bulb if it were connected to 76 V, assuming the resistance stays the same?

A lightbulb is rated at 75 W when connected to 120 V. (a) What current flows through the bulb in this case? A (b) What is the bulb's resistance? Ω (c) What would be the current in the bulb if it were connected to 76 V, assuming the resistance stays the same?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section21.2: Resistance And Ohm’s Law

Problem 21.3QQ: When does an incandescent lightbulb carry more current? (a) immediately after it is turned on and...

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

Question

A lightbulb is rated at 75 W when connected to 120 V.

(a) What current flows through the bulb in this case?
A

(b) What is the bulb's resistance?
Ω

(c) What would be the current in the bulb if it were connected to 76 V,
assuming the resistance stays the same?

(d) What would be its power consumption in this case?

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