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Why is there a curve and not a straight line in the graph for a filament lamp?
Wiki User
∙ 12y ago
I had to answer this and found out that............
The line on the graph that represents the filament lamp is curved because the resistance of it increases with supplied voltage
Hope this is alright for you :) x
Wiki User
∙ 12y ago
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What part of the lamp converts electricity to light?
For a filament-type (incandescent) lamp, it's the filament.
What can you do to make a graph for an lava lamp?
how to make a graph for a lava lamp
Why a bulb cannot be used to verify ohm's law?
A filament lamp does not obey Ohm's Law because, for tungsten, the ratio of voltage to current isn't a constant for changes in voltage. Metals such as tungsten are, therefore, termed 'non-linear' or 'non-ohmic'.There seems to be a major misconception surrounding Ohm's Law. Ohm's Law simply states that 'the current flowing along a wire, at constant temperature, is directly proportional to the potential difference across its ends'. For Ohm's Law to apply, the current/voltage graph line resulting from varying the voltage MUST be a straight line. If it is curved, then Ohm's Law doesn't apply. In fact, most metals and electronic components, such as diodes, do not follow Ohm's Law.So Ohm's Law is NOT a universal law and applies in very few circumstances.The equation R = V/I applies whether Ohm's Law is followed or not, because the ratio of V/I will always indicate what the resistance happens to be for that particular ratio. But the fact that you can use this equation under any circumstance doesn't mean Ohm's Law is applicable.
What type of electromagnetic wave does a filament lamp use?
visible light
Why is a graph of voltage against current for a filament bulb curved?
Because as current increases, heat increases and therefore resistance increases. Since resistance is the gradient of the graph, the gradient will increase and therefore the graph will curve. (The filament in the bulb is an non-ohmic conductor; its resistance is only constant at a constant temperature.)Another AnswerIncandescent lamp filaments are manufactured from tungsten. Tungsten is classified as 'non-ohmic' or 'non-linear', which means that (in common with most materials, in fact) it does not obey Ohm's Law. For a material to obey Ohm's Law, the ratio of voltage to current (i.e. its resistance) must remain constant for variations in voltage -as you have discovered, tungsten doesn't do this, producing a curve, rather than a linear, graph. As the original answer indicates, the temperature coefficient of resistance of tungsten in such that, as it gets warmer, its resistance increases.Those few materials that do obey Ohm's Law are called 'ohmic' or 'linear' materials.
Graph of resistance of filament lamp against potential difference?
It will vary from 0 to a certain value but at a slower rate.
What part of the lamp converts electricity to light?
For a filament-type (incandescent) lamp, it's the filament.
Is non ohmic filament better than ohmic filament?
How can a filament give off heat without resistance?Another AnswerThe terms, 'ohmic' and 'non-ohmic' refer to whether or not a material obeys Ohm's Law. It has NOTHING to do with whether a filament is resistive or not!Ohmic materials obey Ohm's Law; non-ohmic materials do not.GSL incandescent lamps generally use a filament made of tungsten. If you were to apply a gradually-increasing voltage to that filament, and note the corresponding values of current and, then, plot the results in the form of a graph, you would find that the graph is a curve. For Ohm's Law to apply, the current must be proportional to voltage for variations in voltage and this is ONLY true for a straight-line graph. Tungsten, therefore, is non-ohmic and does not obey Ohm's Law.Tungsten is chosen for lamp filaments because it can withstand very high temperatures without failing. This is the main reason that it is chosen, NOT because it is non-ohmic.
Why does the filament lamp does not follow Ohms Law give any example?
A filament's resistance value varies with temperature. When directly measuring resistance, the filament is off, and at or near room temperature. When the circuit is turned on to measure voltage and current, the filament's temperature will increase and the resistance value will increase. This makes it appear as though Ohm's law is wrong.AnswerThere is no difficulty; your experiment will simply prove that the filament of the lamp doesn't obey Ohm's Law.When you plot the results of current against voltage for a lamp's filament, obtained from your experiment, the result will be a curved line, indicating that the current is notproportional to voltage (due to a changing resistance). This shows that the filament doesn't obey Ohm's Law. To obey Ohm's Law, the result must be a straight-line graph.Although the resistance of the lamp can be found at any point along the curve from the ratio of voltage to current (i.e. R = V/I) at that particular point, the lamp does not obey Ohm's Law. Ohm's Law only applies when the ratio of voltage to current remains constant throughout the experiment.So no difficulty has arisen with your experiment, you have simply proved that Ohm's Law doesn't apply to the lamp filament. Believe your results!!
What can you do to make a graph for an lava lamp?
how to make a graph for a lava lamp
How does the graph vary between voltage and current?
If the graph is for Ohmic components e.g resistor or wires -Constant gradient -V is proportional to I The second graph is for Non-Ohmic components e.g Filament lamps/diodes -(v is NOT proportional to I) -Gradient is high at the origin (0,0) and low at the top due to an increase in resistance Hope this helps!! I couldn't put the pictures on, but just google a Filament lamp graph and they will come up :)
Does a lamp with a thick filament draw more current or less current than a lamp with a thin filament?
A lamp with a thick filament will draw more current. What restricts the current flow in the filament is the resistance of the filament which increases as the temperature of the filament increases. A thin filament requires less energy to get heated up that a thick one so less current to achieve threshold resistance. Also a thick filament provides a broader path for current so there is less resistance per increase in degree centigrade. For these two (closely related but distinct) reasons it will require more current for the filament to get heated up to threshold resistance.
Which is more powerful a torch bulb or a mains filament lamp?
Mains filament
Why wouldn't the lamp turn on?
Usual condition, no power source or lamp filament open.
How do you Use filament in a sentence?
(Filament is a thread or thin wire.)Is the lamp unplugged or is the filament broken in the bulb?A silkworm's cocoon is made from a thin filament which can be twisted into thread.
Is resistance in the filament of a lamp essential or not?
Yes, the resistance of the filament of a light bulb is what generates enough heat to make the filament glow and produce light.
What are the parts of a lamp?
fifi eats the filament and turns it into a bernard
