• 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.

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.

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

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

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

So it can be neglected. The last assumption is that all blocks are moving at the same when we place the wooden blocks side by side. The experimental errors can be divided into two errors, systematic errors and random errors. The zero errors of the spring balance and the beam balance are belonged to the systematic errors.

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

To investigate this variable would be very difficult, because it is very hard to know the frequency and wavelength of a certain colour of light without using extremely expensive and sensitive equipment, which I do not have available. Therefore, I will not investigate this variable, and keep it to a

2. ## Electrical Properties of a Filament Lamp - Does a Filament Lamp Obey Ohm's Law?

This loss of energy knocks the voltage and current out of proportion. As the lamp gets hotter, its atoms vibrate more rapidly which bump the electrons more vigorously and cause the loss of the electron's energy to happen faster. This explanation shows how I came to the prediction that the filament light bulb will not obey Ohm's law.

1. ## Investigating electrical behaviour and a filament lamp.

I predict that there will a relationship between the volts and amps. This is because the resistor is going to be constant. I also predict that my graph will have a positive gradient, which means that there will a constant in temperature.

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

Scientific background, explanation and prediction Ohm's law states that for some conductors, the current flowing is proportional to the voltage as long as the temperature remains constant. This would give a graph like this: However, for our experiment I would predict a graph like this: This is because I think

1. ## Intensity on the power output of a solar cell.

The part of the silicon containing phosphorus atoms is known as an N-type material ('n' for negative) as a result of the free electron. The other part of the silicon structure is doped with boron atoms. These only have three outer electrons meaning the boron-doped silicon becomes P-type silicon.

2. ## Find out how the current through a filament lamp varies with the potential difference ...

the lamp to heat up, this is where the ions vibrate rapidly and cause the electrons to be diverted this makes the electrons lose energy due to heat and light. Also the filament of the lamp may be impure and have ions that obstruct the flow of the electrons causing them to take another route round the ion. • Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to 