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

An Investigation To Show How the Voltage Affects the Current In a Light bulb.

Extracts from this document...

Introduction

AN INVESTIGATION TO SHOW HOWTHE VOLTAGE AFFECTS THE CURRENT IN A LIGHTBULB

Aim:~ An investigation to show how the voltage affects the current flowing through a light bulb.

Hypothesis:~ I predict that as the current increases the voltage of the lamp will also increase; thus causing the resitance to decrease. I think this because of Ohm’s Law which states that current will increase in proportion to voltage; if the current is doubled the voltage is also doubled.

Bearing this in mind my graph should resemble my diagram below:

image00.png

X

X

         X

    X

                                Ximage06.png

      X

  X

         X

image09.png

If the voltage across a light bulb is increased, more current will flow through it. If the number of bulbs in a series circuit is increased, less current will flow through them. The lamps resist the current, so if you put more lamps into the circuit there is more resistance. As the resistance of the variable resistor decreases the current in the circuit increases until the bulbs burn out.

...read more.

Middle

image15.png        Variable Resistor

image15.png        12 volt lamp

image15.png        Battery pack

image15.png        Wires

image15.png        Crocodile clips

Diagram:~image11.pngimage10.png

image12.pngimage13.png

image01.png

image02.pngimage03.png

image04.png

image05.png

image03.png

image03.png

image07.png

image08.png

Planned Method:~ I will set up the apparatus

...read more.

Conclusion

To make this experiment more accurate I could have used electronic equipment which would accurately measure the volts and amps so that there would be no human errors. To extend this investigation I could have used different types of bulbs with a different size of maximum voltage. I could have taken more readings, perhaps repeated the experiment a few more times and used a wider range of current.

I will do a preliminary test to find the range of current in amps. I will do this by moving the variable resistor to its lowest and highest points and noting down the amps. In this case the lowest point is 0.5 and the highest is 1.6 amps.

I will start with 0.5 amps, working systematically, I will note down the voltage every 0.1 amps. I will do this until I reach the highest point which is 1. 6 amps. I will then repeat this to see if my results have changed or are the same.

...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. Investigation into the resistance of a filament lamp.

    These include no running whilst experiments are in progress, hair tied back, jewellery tucked away and carrying out all experiments on benches clear of school books and standing up with stools tucked under benches. Also, as the potential difference is increased the more the current flows through the circuit.

  2. The aim of my investigation is to determine the specific heat capacity of aluminium.

    The stop clock recorded to the nearest second, the largest error will occur at the lowest time, which is when the first recordings take place after 60 seconds. Stop clock, %error = 1 x 100 60 = 2% This is also quite a small source of error.

  1. Magnetism Investigation

    The apparatus is leveled by removing the frame from the balance and adjusting the leveling screw under the base. The frame should be replaced with the knife edges (K) positioned on the bearing posts so that the pins on the beam-lift engage easily.

  2. Sensors cwk. The aim of this coursework is to construct a potential divider circuit ...

    > Repeat the last step for each different marked point up to 200cm. > Tabulate the results and then draw graphs of them. After drawing the graphs, I will be able to calibrate the Light Dependent Resistor. Once I have drawn my graph I should end up with a 'calibration curve'.

  1. A2 Viscosity investigation

    As previously stated the timing will not begin until the ball has travelled a few cm and is at terminal velocity this is because the equations will only work at terminal velocity and if this is not the case the results will not be very accurate.

  2. Using an LDR to detect the intensity of plane polarised light allowed through a ...

    Firstly, I will work out the formulae for orders of magnitude, and then I will be able to further narrow it down. Value of Resistor Value of Output p.d 100? 1k? 10k? 100k? Naturally I will have to measure it for my LDR, but internet reports on the internet seem

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

    4356 1.3 x 6.0 x 900 7020 1.4 x 7.2 x 900 9072 1.6 x 8.5 x 900 12240 1.8 x 10.9 x 900 17658 2.1 x 12.0 x 900 22680

  2. Choosing a light source

    were close but not close enough like natural light. TASK 3: In this task I am going to research how a spectrometer and a diffraction grating can be used to determine the wavelength of light sources. This is a spectrometer The sorts of reads you need to take or have are: 1. sin ? (which represents the angle i.e.

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