The average temeprature coefficient of tungsten is `5.1xx10^(-3)//.^(@)C`. The filament of an electric at lamp has a cold resistance of `9.7 Omega at

The average temeprature coefficient of tungsten is `5.1xx10^(-3)//.^(@)C`. The filament of an electric at lamp has a cold resistance of `9.7 Omega at 20^(@)C`. When glowing fully it has a resistance of `121Omega`. Calculate its temperature. If is a 100-watt lamp, what current does it consume?

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

Salim Ahmed Kawsar

Correct Answer - `2499^(@)C,32A` when cold and 0.91A when hot

5 views Answered 2023-02-05 15:29

Related Questions

A Choke coil is needed to operate an arc lamp at `160 V` (rms) and `50 Hz`. The lamp has an effective resistnce of `5 Omega` when running at 1`0 A("rm

2 Answers 5 Views

If `omega` is any complex number such that `z omega=|z|^(2)` and `|z-barz|+|omega+baromega|=4`, then as `omega` varies, then the area bounded by the l

2 Answers 7 Views

If `alpha`, `beta`, `gamma in {1,omega,omega^(2)}` (where `omega` and `omega^(2)` are imaginery cube roots of unity), then number of triplets `(alpha,

2 Answers 6 Views

If `y_(1)=max||z-omega|-|z-omega^(2)||`, where `|z|=2` and `y_(2)=max||z-omega|-|z-omega^(2)||`, where `|z|=(1)/(2)` and `omega` and `omega^(2)` are c

2 Answers 5 Views

In the grease spot photometer, a lamp with dirty chimney is found to balance an electric lamp of constant illuminating power at a distance of `0.1` m

2 Answers 5 Views

The wavelength of `K_(alpha)` X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell ofa tungsten atom. What should

2 Answers 4 Views

The temperature coefficient of a resistance wire is `0.00 12.5^(@)C^(-1)`. At 300 K, its resistance is `1 Omega`. At what temperature the resistance o

2 Answers 6 Views

The resistance of two conductors in series is `18 Omega` and the resistance becomes `4 Omega` when connected in parallel. Find the resistance of indiv

2 Answers 4 Views

A 20 V battery of internal resistance `1 Omega` is connected to three coils of `12 Omega, 6 Omega` and `4 Omega` in parallel, a resistor of `5Omega` a

2 Answers 5 Views

A 60W lamp is rated at 0.8 watt/candela. Calculate (i) luminous intensity of the lamp, (ii) luminous flux of the lamp, and (iii) illuminance at a dist

2 Answers 4 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)