• 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...


Year 10 Physics Investigation

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


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.


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.



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.














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.


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 therefore could either increase/decrease the e.m.f causing more inaccuracies. - The battery heating up can also increase the resistance because more chemical reactions take place as the current is flowing in the cell, this therefore makes the ions in the cell vibrate, and as more kinetic energy is supplied

  2. Investigation into the resistance of a filament lamp.

    Blue: 500 nm Green: 550 nm Yellow: 600 nm Red: 650 nm The wavelength of maximum emission of any body is inversely proportional to its absolute temperature. Thus, the higher the temperature, the shorter the wavelength of maximum emission. When we got a rough estimate of the wavelength at various points, we can use Wien's law to find the temperature.

  1. Characteristics of Ohmic and Non Ohmic Conductors.

    When the current is passed through the atoms vibrate more and collide with some of the other atoms and then give out this kinetic energy. Thus as the current flows the kinetic energy of these atoms is increased. Thus this energy is lost as heat and so makes it difficult for the electrons to pass through.

  2. A2 Viscosity investigation

    We know that weight will be the only force acting downwards whilst both the viscous drag and the up thrust will oppose this. So as the forces are balanced you know that weight=viscous drag+ up thrust. You know that: - Viscous drag=6?r?v which is stokes law (where ?

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

    In my prediction, I stated that: If the light bulb becomes brighter, the resistance of the LDR decrease. From my graph on the previous page, it shows that I am right. I can see that the resistance of the LDR is in strongly correlation to the current of the light bulb after 25MA.

  2. Characteristics of Ohmic and non-Ohmic Conductors.

    Semi-conductors Semiconductors are a special class of materials with the common feature that they all conduct electricity better with an increase in temperature. Most semiconductor materials are metal oxides whose resistance decreases rapidly, as temperature increases. This is because as the voltage increases, the temperature increases, and this extra energy is used to liberate more electrons in the semiconductor.

  1. Investigating how temperature affects the resistance in a wire

    I can conclude this as although the results do not show any immediate patterns, both the linear and the logarithmic treadlines have a negative gradient (are sloping downwards). This means that I can classify the results as having a very weak negative correlation, according to these results, the higher the

  2. Investigating The Resistance Of A Light Bulb As The Voltage Is Increased.

    Also the temperature can affect the resistance. The diagram below shows inside a piece of wire showing the free electrons-the flow- and the metal ions. If the temperature is increased then the free electrons in the diagram will hit the metal ions more creating more resistance. If the thickness of the wire was changed i.e.

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