Is a filament lamp an ohmic resistor?

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Is a filament lamp an ohmic resistor?

During this coursework I am investigating to find out whether a filament lamp is an ohmic resistor, an ohmic resistor is a resistor that follows ohm’s law.

I want to get the results as accurate as possible so I shall us a digital ammeter and voltmeter and record my results to 2 decimal places.

Before I started the investigation I had to find some research. I researched 3 books to find out mainly about resistance, ohm’s law and ohmic resistors.

The first book was: -

Extension Physics by Brian Milner

“To make a bulb light up, you must out a potential difference (voltage) across it. A current can then flow through the filament of the bulb. The filament resists a current flowing though it, so we say it has a resistance”.

“We measure resistance in units called ohms. To measure a resistance you nee to know how big a current flows through it when you put a particular potential difference (P.D) across it. Then you can work out the resistance like this:

             Resistance = Potential difference (volt, V)

               (ohms,   )       Current (amperes, A)

The filament of a bulb becomes hot because it resists the current flowing through it.”

Physics for today and tomorrow, 2nd edition: tom Duncan.

Ohm’s law:

“When the same p.d. is applied across different conductors different current flow depending on how easily electrons can more in them. The opposition of a conductor’s to current flow is called its resistance. A long thin wire has more resistance than a short thick one of the same material because a given p.d. causes a smaller current in it.”

“A good conductor has a low resistance and a poor conductor as a high resistance. Silver is the best conducting material. But copper, the next beat is much cheaper and is used for connecting wire and cables in electric and cables in electric circuits.  Good insulators for static electricity are also good for current electricity.

Finally in the last book I got this information, which I think is a lot simple

Heinemann coordinated science: foundation physics: David Song.

Resistance-how difficult it is for electric current to flow through something.

Resistor – An accompaniment in a circuit, which makes it difficult for electric current                              to flow

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You can calculate the resistance with this equation:

Resistance = Voltage   or          R =V                        

                     Current                         I


The current through a metallic conductor is directly proportional to the P.D. across its ends ...

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