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

The aim of this investigation is to see what the relationship between voltage, current and resistance is.

Extracts from this document...

Introduction

GCSE science Coursework

An investigation into the relationship:

V=I.R

September 2003

By Helen Crutcher

Bibliography

The aim of the investigation

The aim of this investigation is to see what the relationship between voltage, current and resistance is. We will be conducting two different experiments investigate Ohms law, V=I.R using, in our first experiment wire thickness as our input variable. In our second experiment, we will use wire length. In each, we will record the Voltage and current running through the circuit and use this information to work out wire resistance.

Background information

Voltage: Voltage is

Current:  Current is

Resistance: Resistance isa measure of how much the current in a circuit is slowed down. Resistance is caused when electrons have to’jump’ from one It is measured in Ohms (Ω)

Ohms law

Electrons

Introduction

Hypothesis- the thicker or shorter the wire the easier it

...read more.

Middle

Wire thickness

Voltage

Current

Resistance

The gradient of this graph represents mass, so this shallow gradient shows that the mass must be large.

Evaluation of preliminary experiment

Our preliminary experiment shows us that we will be able to use this range of values for our final experiment since they gave us results that were relatively consistent with our hypothesis.

Equipment needed:

  • Different lengths of  Nickel Chrome (nichrome) wire(experiment two)
  • Different widths of !0 cm long Nichrome wire (experiment one)
  • Ammeter
  • Variable resistor
  • Voltmeter
  • Power pack
  • wires
  • Crocodile clips
  • Pulley
...read more.

Conclusion

image00.png

Analysis

Evaluation

ResistanceResistance is measured in Ohms (symbol Ω).
Resistance 
The
bigger the resistance, the smaller the current.

The very important equation

V = I x R

is an expression of Ohm's Law.
You
MUST KNOW this equation for the exam!

If the resistance of a component is constant (stays the same)
for different values of
V and I,
then a
plot (graph) of V against I will be a straight line.
The
gradient (slope) of the line shows how big the resistance is.

image01.png

A test circuit is used to find a range of voltages and currents for a component.Components which obey Ohm's Law are Wiresand Resistors.
A
component will only obey Ohm's Law at constant temperature
(meaning that the
temperature must not change).In reality, an increase in current through a component
will change its temperature (the temperature usually goes up),
and so
Ohm's Law is only an approximation
but it works quite well for
many components.
The next page shows
plots for components which don't obey Ohm's Law.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism 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 GCSE Electricity and Magnetism essays

  1. Marked by a teacher

    An Investigation To See How Resistance Can Be Changed By Variables.

    4 star(s)

    0.56 28 0.4 32 0.28 36 0.2 This is the table of variables all these will be carried out in the experiment to insure it is a fair and even test. Equipment; The equipment needed for this experiment is; * Power pack- to insure there is a low current.

  2. Physics Coursework Gravity Investigation

    to act on the golf ball for longer, reducing the amount of kinetic energy the ball acquired on its decent, resulting in a lower bounce height. A more accurate way of proving the increasing effect of air resistance as the release heights increase, is to take the average bounce height

  1. Ohms Law.

    Results To calculate the resistance of the wire, I shall use the equation below. RESISTANCE = VOLTS/AMPS Below is a results table with the results that I collected from my main experiment. 1 2 3 4 5 Length (cm) Volts (V)

  2. Investigation to see the relationship between actual and theoretical energy released when burning different ...

    I could use different alcohols, such as all the isomers of each type of alcohol, to see if there are significant differenced between them. I think that the reaction that is involved in burning alcohols is exothermic because I know the products of carbon dioxide and water made need a

  1. To investigate the relationship between the structure and heat provided by combustion of a ...

    Apparatus ==> 1 can ==> 1 measuring cylinder ==> Water ==> 1 thermometer ==> 1 stand ==> 1 clamp ==> 1 boss ==> 1 heat mat ==> 1 alcohol burner/candle ==> 1 balance ==> Draught shields Fig1: Experiment setup. Method Safety must be ensured at all times, as highly flammable substances are being burned here.

  2. Resistance Investigation

    have only one resistor are the same in both parallel and in series and they show this via the results. I also found that when the thickness of the wire increases, the resistance decreases. So, the two main factors that affect resistance are, thickness and length.

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