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

    This means that the change in temperature will be smaller and therefore using the equation c=ItV/m T, the value calculated for the specific heat capacity will therefore be falsely high and may explain why the calculated value was 1290Jkg-1 0C-1 which was the highest value and therefore the least accurate of all of my results.

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

    So the resistance of the LDR increase four times. Fair test: But there are some variables, which can also affect the brightness of the light bulb: 1. As the reasons show above, the brightness of the light bulb plays the main role in affecting the resistance of the LDR. 2. The distance between the light bulb and the LDR.

  1. Relationship between the current and voltage.

    This is exactly the same a saying that V is directly proportional to I. As this is the case, I expect a graphs for both the " wire wound resistor," and the "light bulb," to have graphs with a positive gradient.

  2. Characteristics of Ohmic and non-Ohmic Conductors.

    Identifying any anomalous errors present and offering a solution: For my filament lamp and thermistor graphs, I got a few points outside the line of best fit. This shows that there was an error present this may be because I didn't wait for them to heat before taking the current readings.

  1. Investigation into the resistance of a filament lamp.

    so therefore the ions vibrate and obstruct the electrons, that increase the resistance. Key variables: Dependent: I will be estimating the temperature of the filament lamp for different potential difference. The units for temperature will be Kelvins, for voltage it would be Voltage.

  2. Characteristics of Ohmic and Non Ohmic Conductors.

    I+ 40oC 20oC V- V+ I- For the given Thermistor the graph shows the different resistance in different temperatures. At 40oC, there will be less resistance because as we already know the temperature causes the electrons to be freed and carry the current.

  1. The aim of this experiment is to investigate the relationship between the current, voltage ...

    Ohm's law and how resistance is affected by V, I and temperature. All parts of the hypotheses were confirmed to be correct and supported by the results that were obtained. Conclusion Looking at the graphs and the table of results it is clear that what I hypothesised at the beginning

  2. A2 Viscosity investigation

    I would have liked to use larger distance for the ball to travel but with the equipment available this is not possible so these percentage errors will be greater than I would have liked. Ensuring the judgement of the ball bearings is at eye level is vital as this is

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