Tags Science Physics

Animals & Plants Arts & Entertainment Auto Beauty & Health Books and Literature Business Electronics Engineering & Technology Food & Drink History Hobbies Jobs & Education Law & Government Math People & Society Science Social Studies Sports Travel & Places

0

Subjects>Science>Physics

How do we calculate the cold resistance of the bulb?

Anonymous

∙ 7y ago

Updated: 6/5/2024

The cold resistance of a bulb can be approximated by measuring the resistance of the filament with a multimeter when the bulb is turned off and at room temperature. The resistance measured in this state can give an estimation of the cold resistance of the bulb. Keep in mind that this value may not be exact due to factors like the temperature coefficient of resistance and the non-linear behavior of the filament's resistance.

AnswerBot

∙ 9mo ago

Still curious? Ask our experts.

Chat with our AI personalities

Lao

The path is yours to walk; I am only here to hold up a mirror.

Chat with Lao

Jordan

Looking for a career mentor? I've seen my fair share of shake-ups.

Chat with Jordan

Beau

You're doing better than you think!

Chat with Beau

Add your answer:

Earn +20 pts

Q: How do we calculate the cold resistance of the bulb?

Write your answer...

Submit

Still have questions?

imp

Continue Learning about Physics

How do you work out the current of a light bulb?

You can use Ohm's Law to calculate the current of a light bulb by dividing the voltage across the light bulb by its resistance, which is typically provided on the bulb itself or its packaging. The formula is: Current (I) = Voltage (V) / Resistance (R).

Which has the thickest filament - a high-resistance or a low-resistance bulb?

A high-resistance bulb typically has a thicker filament compared to a low-resistance bulb. The thicker filament in a high-resistance bulb can withstand the greater heat generated by the increased resistance, resulting in a longer lifespan for the bulb.

What can be inferred about the current passing through the bulb?

The current passing through the bulb is directly related to the voltage applied across it and the resistance of the bulb. Using Ohm's Law (I = V/R), we can calculate the current flowing through the bulb by knowing the voltage and resistance values. Additionally, the brightness of the bulb can also be an indicator of the current passing through it, as higher current typically results in a brighter bulb.

Does the resistance of a filament light bulb change as the bulb gets brighter?

Yes, the resistance of a filament light bulb increases as the bulb gets brighter. This is due to the increase in temperature of the filament, which causes the resistance to go up.

What is the resistance of a 40 watt bulb?

To calculate the resistance of a 40 watt bulb, you need to know the voltage it operates at. You can use the formula P = V^2 / R, where P is power (40 watts) and V is voltage. Without voltage information, the resistance cannot be determined.

Trending Questions

What scientist suggested that electrons have fixed orbits? What is the expansion for caiib? What force does emf measure? What was the outside of the atomic bomb made of? What is the fulcrum? How long does it take plutonium to decompose? Why is light invisible to the human eye? What 2 forces affect you when you float how do these 2 forces compare in size? What is the difference between gravity and upthrust? How many Fahrenheit are there between the 0 Celsius mark and the 100 Celsius mark? A material that does not carry heat well? What is vscosity? Do energy drinks make you hungry? WHAT IS COTTON SATIN FABRIC? Factors affecting for length of a convex lens by the lens displacement method using cojugate foci? What is the spooner position? What happens when an object gains electrons? What happens to Brownian motion when heated? What laser penetrate deeper 830nm or 630nm? If a virtual image is formed along the principal axis 10 cm from a concave mirror with the focal length 15 cm what is the object distance from the mirror?

Related Questions

What is cold resistance?

That is e.g. the resistance of a cold bulb before the bulb is lighted and heats up.

What is meant by cold resistance of filament lamp?

It means exactly what it sounds like. The resistance of an incandescent bulb's filament depends on its temperature. A filament has a positive temperature coefficient, which means that its resistance increases as its temperature increases. A typical 40 watt bulb (120 volts) has a cold resistance of about 28 ohms, but its hot, operating resistance is about 360 ohms. If the cold resistance were constant, the bulb would dissipate 379 watts. In fact, cold turn on is the most stressful time for a bulb.

What is the resistance of a lightbulb using Ohm's law?

By Ohm's law, resistance is voltage divided by current, so the resistance of a light bulb can be measured by observing the voltage across it simultaneously with observing the current through it. Interestingly, the hot resistance is significantly different that the cold resistance, so measuring resistance with an ohmmeter will not give a meaningful resistance. This is because the resistance of a light bulb has a positive temperature coefficient. Take a typical 60 W 120V light bulb, for instance... Its cold resistance is about 16 Ohms. Calculate current and power at 120 V and you get 7.5 A and 900 W. The truth is that at 60 W, the bulb pulls 0.5 A and has a resistance of 240 Ohms.

What does a light bulb have?

The resistance of a light bulb varies, depending on the type of bulb, the power rating, and the temperature. A typical incandescent 60 watt bulb, for instance has a cold resistance of about 30 ohms, and a hot resistance of about 240 ohms.

How do you work out the current of a light bulb?

You can use Ohm's Law to calculate the current of a light bulb by dividing the voltage across the light bulb by its resistance, which is typically provided on the bulb itself or its packaging. The formula is: Current (I) = Voltage (V) / Resistance (R).

Why does the resistance of a filament bulb depend on the current in the bulb?

The resistance of a piece of wire changes with temperature. In a filament bulb the wire is heated to about 3000 degrees C so a large change in resistance can be expected. A 240 v 105 w halogen bulb has a cold resistance of 35 ohms, but when running its resistance is 549 ohms.

What is the resistance of a fuse bulb?

A lamp has two resistances: a 'hot' resistance (its operating resistance) and its 'cold' resistance (its resistance when switched off), and the hot resistance is significantly higher than its cold resistance.You can calculate its 'hot' resistance from its rated power and its rated voltage (assuming that it is being supplied at its rated voltage), by manipulating the following equation, to make Rthe subject: P= V2/RYou will, though, have to measure its cold resistance.

Does the resistance of a light bulb filament change after the light has been turned on?

The electrical resistance of a light bulb increases when it is turned on As a resistor, the tungsten light bulb has a positive resistance coefficient. This means that the electrical resistance goes up when the filament becomes hot. For example, a 100 watt light bulb operated at 120 volts - it does not matter if it is AC or DC for this calculation - will have a resistance of 144 ohms when hot and draw .833 ampere. When cold the filament typically has a resistance of only 10 ohms which increases as the filament heats up.

Which has the thickest filament - a high-resistance or a low-resistance bulb?

A high-resistance bulb typically has a thicker filament compared to a low-resistance bulb. The thicker filament in a high-resistance bulb can withstand the greater heat generated by the increased resistance, resulting in a longer lifespan for the bulb.

Calculate the resistance of a 45 W light bulb that has a current of 0.38 A?

The formula you are looking for is R = W/I x I.

What can be inferred about the current passing through the bulb?

The current passing through the bulb is directly related to the voltage applied across it and the resistance of the bulb. Using Ohm's Law (I = V/R), we can calculate the current flowing through the bulb by knowing the voltage and resistance values. Additionally, the brightness of the bulb can also be an indicator of the current passing through it, as higher current typically results in a brighter bulb.

What will happen if a second bulb is added to a parallel circuit?

-- The voltage doesn't change. -- If the second light bulb is identical to the first, then the total resistance drops by half. -- If they're not identical, then we have to know the details of both before we can calculate their combined effective resistance.

Still have questions?

imp

Resources

Top Categories

Product

Company

Copyright ©2025 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.