Part of The Student Room Group

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

In this experiment we had to investigate how the power dissipation of a filament lamp varied with different potential differences across the circuit.

Extracts from this document...

Introduction

Experiment to find the relationship between power

Applied and potential difference

Introduction

        In this experiment we had to investigate how the power dissipation of a filament lamp varied with different potential differences across the circuit. Also to find a relationship between the power and potential difference, from this information draw a graph and collect suitable results.

Method

        I connected a power supply to a filament lamp (10v maximum output) this was then connected to an amp meter this was then connected back to the power supply.

...read more.

Middle

From this we then calculated the power by multiplying the current by the potential differences. And then on excel working out the log of volts and the log of power and composing a graph.

Results

        The result from this experiment shows that there is a linear relationship between the voltage across the circuit and the power. The graph produced is a straight line graph that goes through the origin. On my graph there are some anomalies  but these are very small variations that are not along the trend line for example log p= 1.0 and log v= 0.

...read more.

Conclusion

        The experiment was quite simple and had hardly any problems with it how ever if I was to repeat the experiment I would look into improving the sensitivity of the experiment that I used, because or though the experiment was appropriate I would like to make my calculations and readings more accurate therefore not having any anomalies results on my graph. This could be done by increasing the scale the volt and amp meter sensitivity therefore reading smaller changes in volt or amps.

                        By Stuart Norris

...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

or


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.

    The tungsten filament evaporates more rapidly as the temperature of the filament goes up. The evaporated tungsten particles tend to deposit on the glass envelope, causing over time, an increase in light absorption. Depending on the application, the light output obstruction could be high enough to end the useful life of the lamp.

  2. The Resolving Power Of The Eye

    In total darkness with the LED turned on behind the card stand or kneel so that the two apertures are at eye level. From close to the card work gradually backwards until the two lights can only just be defined and appear separate.

  1. Is a filament lamp an ohmic resistor?

    This is the one fact that you should remember and try to visualize when working with electrical circuits. Electric current is the movement of electrons from one atom to another in a conductor. If you can visualize a piece of copper wire with billions of atoms and each one of

  2. The aim of the experiment is to verify the maximum power theorem and investigate ...

    / (4.88 - 0.0) �s = 0.727 (Cor. to 3sig. Fig.) Let the slopes of the two good- fit lines be m1 and m2. m1= ( 5.0 - 3.55) / (6.5 - 4.88) = 0.895 m2= ( 5.5 - 3.55)

  1. To investigate the effects of two different variables on a solar cell output.

    the distance between the bulb and solar cell increase, the light intensity will decrease because the light is occupying more space when its distance is further from the solar cell. This will mean that the energy supplied to the solar cell will be less as the distance between the solar cell and bulb increases.

  2. To discover whether a filament lamp is an ohmic conductor.

    the resistance of the light bulb will not remain constant, but will increase due to an increase in temperature. As the temperature rises the filament in the bulb will begin to heat and the tungsten atom's vibration will get larger.

  1. Investigating electrical behaviour and a filament lamp.

    There will a relationship between the amps and the volts. I predict that the line for the graph of the resistor. I predict this because no heat at all is given off, therefore it will not affect the resistor. Heat is not give out by the resistor however like the filament lamp does give out heat.

  2. Intensity on the power output of a solar cell.

    All of these atoms are sharing with four other atoms and as a result, a crystalline structure is formed. A downside to this however is that none of the electrons are free to move thus making silicon a poor conductor of electricity.

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