• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

How the resistance of a filament bulb varies its current flowing through it

Extracts from this document...

Introduction

Filament Bulb Investigation

How the resistance of a filament bulb varies its current flowing through it?

Aim: the purpose of this investigation is to find out how the resistance of a filament bulb varies with current flowing through it.

Hypothesis: I think the higher the voltage the brighter the bulb will be because then there will be an increase of current and the electrons are given more energy and more are forced through, therefore the bulb would be able to resist more. If the voltage increases the bulb will shine bright because the bulb would have more energy.

Controlled Variable- the controlled variable for this experiment is number of bulbs because the decision is for me to make.

Independent Variable- the independent variable for this experiment are the volts, I will be using 1-12v.

...read more.

Middle

Brightness

Resistance

 1

0.004

N

250

2

0.01

N

200

3

0.02

N

150

4

0.03

N

133.3

5

0.06

N

83.3

6

0.08

N

66.7

7

0.09

VVD

77.7

8

0.11

VD

72.7

9

0.12

D

75

10

0.14

D

71.4

11

0.15

N

73.3

12

0.17

N

70.6

Data Processing-This is my result over as you can see from the reading of the ammeter, the difference while increasing 1 volt isn’t much. The pattern shows two is amps is added frequently or 1. The brightness level in this experiment wasn’t that exciting as in the bulb lit up

...read more.

Conclusion

Conclusion- as for conclusion I would say the higher the voltage the brighter the bulb gets. However, in our experiment at a point the bulb burst because it could not take anymore.

Evaluation- Like all experiments this experiment had human errors too for example while we took the result of the ammeter it changed, as in there was 1dp difference therefore I would count that as the only human error. Since it did not include a lot of difficult measurements there was no human error. I could have definitely improved on this investigation if I did it with more bulbs than it would clearly show my point. The validity of my result would surely make my results more accurate. If I got the opportunity to do this test again I would perhaps use the mille ammeter which would give me a more detailed accurate reading.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. To Investigate How the Resistance of the Light Dependent Resistor Depends On the Current ...

    the same. I also varied the current of the light bulb as accurately as possible. The anomalous points may because I did not put the black tube in the right position, so some of the light in the room get into the LDR, this cause the resistance lower than it supports to be.

  2. Investigating The Characteristics Of A Light Bulb.

    Analysis On the both my graphs the pattern is that when the voltage increases, so do the current and the resistance. From the graph you can see that the voltage and the current have increased because (from 12-volt bulb no.1)

  1. Efficency of a light bulb( Analysis of data)

    Circuit diagram of the experiment The law of conservation of energy states that energy may neither be created nor destroyed. Therefore the sum of all the energies in the system is a constant. So the energy input is equal to the energy output.

  2. Coursework To Find The Internal Resistance Of A PowerSupply

    The power supply will then be switched off. The resistor will then be moved up slightly and the same procedure will begin until results of V and I have been taken for eight increasing resistance settings. This procedure will then be followed for power supply voltage set at 4V, 6V, 9V and 12V.

  1. Investigating the resistance variation of filament bulbs.

    The resistance of the bulb at normal temperature is 6V/0.06A, which is 100 ohms, so if the filament bulb gets colder this will decrease, however if gets hotter it will be more than 100 ohms. Before doing the experiment I found out a resistor graph is a diagonal, positive straight

  2. Find out whether a longer wire or a shorter wire will have more or ...

    I think this because the current will have to flow through a longer distance and therefore it causes a higher rate of resistance. This is due to the force being pushed and travelled a longer way. If I double the length of the wire, the resistance will also double, which

  1. Investigation into the resistance of a filament lamp.

    because the vibrating ions obstruct electrons at high temperature so therefore that increase the resistance) > The impurities of a metal, the resistance of a impure metal is greater than that of a pure metal. Current Definition: Current is the movement of electrical charge - the flow of electrons through the electronic circuit.

  2. Geothermal energy is not easily accessible with our current technology. Our main focus was ...

    Lately, scientist and engineers have been researching new methods more economic and efficient than the previous conventional technique. Recently scientists have come up with a new drilling technique called hydrothermal spallation. The method involves chemically breaking down the rocks rather than physically breaking it down.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work