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

Investigation to show the Effects of a Filament Bulb in a Circuit.

Extracts from this document...

Introduction

Year 10 Physics Investigation

Investigation to show the Effects of a Filament Bulb in a Circuit

Plan:

Not all objects give a straight line graph. This experiment investigates what happens when another object, a bulb, is added into a circuit. The current will then be measured and we will investigate what happens to the current and resistance when a bulb is added to a circuit including an ammeter, voltmeter, variable resistor, and a cell. The current and resistance will be measured and we will investigate what happens to the current and resistance when more volts are applied into the circuit. I am going to compare the graph below, from a previous experiment, with

...read more.

Middle

2. I will then connect all the equipment making a parallel circuit.

3. Lastly I am going to record the current that different inputs of voltage give me then calculate the resistance.

Diagram:

Prediction:

If the voltage is increased I predict that it will affect the current by making it rise. Eventually the current will level off because there is a bulb in the circuit. Due to the movement of electrons going through it, the thin wire in the bulb will resist more. The wire has a certain resistance to the current because the greater the resistance, the more voltage is required to push a current through a wire.

...read more.

Conclusion

0.99

4.19

5.78

1.13

5.12

7.73

1.32

5.86

9.72

1.45

6.70

Graph:

The graph is not a straight line therefore I know that the bulb is a non-ohmic conductor. It doesn’t obey Ohm’s Law.

The metal filament gets hotter as more current flows and so its resistance increases. As shown above, this means that the graph gradually gets flatter.

Conclusion:

My prediction was correct. When a bulb is added to a circuit, the current levels off, due to the resistance caused by the electrons getting hotter in the wire filament of the bulb. This also means the resistance increases. When there is no bulb in the circuit the resistance stays the same.

To improve my experiment I could have repeated the experiment to work out average results. By doing this it would make the experiment more accurate by eliminating any mistakes or anomalous results.

...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. Investigating the E.m.f and Internal Resistance of 2 cells on different circuit Structures.

    This increases the current and reduces the e.m.f therefore creating an inaccuracy - The circuit could have been left closed after each reading, therefore the e.m.f will drop as the current flows, because there will be chemical reactions taking place in the cell which could also increase the internal resistance

  2. Characteristics of Ohmic and Non Ohmic Conductors.

    circuit, when the temperature is kept at a low value such as 1 or 2 A is as shown: Aluminium Nichrome Current / A + Current / A + Voltage/ V + Voltage / V+ Resistance = V = gradient -1 I This shows that the line that is formed is a straight line passing through the origin.

  1. 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

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

    As all light travels at the same speed (300,000,000 m/s), we know that the wavelength of the light will determine how much energy is given out from the light. The wavelength and frequency are directly related in light, because both multiplied must give a product of 300,000,000 m/s.

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

    We know that this is the case because when combining the two below formulae, we can see that energy and frequency are related. Wavelength x Frequency= Wave Speed Planck's Constant x frequency= Energy The second formula states that frequency is directly proportional to energy.

  2. Investigation into the resistance of a filament lamp.

    The potential that these charges have for doing work if they come together is called voltage (V). (http://learn.wwtc.edu/circuit/Cffs/cf1/cf1unit2/VCRsep.html) Temperature We know that as temperature increases the resistance increase as well this is because when we increase temperature we are giving more kinetic energy to the ions and they vibrate around

  1. Characteristics of Ohmic and non-Ohmic Conductors.

    Different ohmic conductors will have different resistance, the graphs of all these conductors will pass through the origin, but their gradient will vary. Voltage (V) Good conductor Poor conductor Current (I) The steeper the graph, the lower the resistance. The flatter the graph, the higher the resistance.

  2. How a filament light bulb effects current and voltage.

    measurements of the 4voltmeter and the ammeter 5Turn the power pack off move the variable resistor 6Repeat this 7 times to make the experiment fair 7Now swap the fixed resistor with a filament light bulb 8Take the readings as before and turning it on and off like before and repeat this 7 times.

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