• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7

# Coursework for physics - resistance of a wire

Extracts from this document...

Introduction

Investigation

Resistance of a wire

Introduction:

In this investigation we will aim to find how the resistance in a wire affects the resistance in a circuit, by firstly changing the type of wire we use and then, in the main test to see how the length of the wire changes the resistance in an electrical circuit. In the pre-test the variable is the type of wire which we used, we used this information to see what wire to use in our main test. In the main we changed the length of a wire to see how the length of the wire will change the resistance in the current.

Hypothesis:

In our investigation we will see how changing the type of wire and the length of wire this affects the resistance for electrons flowing through the circuit. As electrons enter the wire they collide with ions which are a form of resistance. As these electrons move along, and the particles collide, other electrons leave the wire at the other end, as the electrons are pushed out. When you change the type of wire you are changing how the electrons will flow in the circuit, as the different lengths and types of wires have different atoms and

Middle

Main test

 Ohm's Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance. One ohm is the resistance value through which one volt will maintain a current of one ampere. (I) Current is what flows on a wire or conductor like water flowing down a river. Current flows from negative to positive on the surface of a conductor. Current is measured in (A) amperes or amps. (E) Voltage is the difference in electrical potential between two points in a circuit. It's the push or pressure behind current flow through a circuit, and is measured in (V) volts. (R) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows a large amount of current to flow. Resistance is measured in ohms. (P) Power is the amount of current times the voltage level at a given point measured in wattage or watts.

Equipment

• Battery pack-This will be used to supply power to the circuit
• Leads-These connect up components in the circuit
• Constantan wire-This is our test wire and is our independent variable with different lengths
• Volt meter-This measures the volts in the circuit
• Ammeter-This measures the amps in the circuit
• Meter ruler-Used to measure length of wire used
• Invariable resister-used to allow our charge to be the same in each experiment
• Crocodile clips-to attach the independent variable to the circuit

Method

1. Collect equipment
2. Attach Constantan wire to a meter ruler
3. Set circuit up as shown above
4. Turn battery pack on
5. Adjust the rheostat to give a current of 0.28amps
6. Attach crocodile clips to where you want to the measure
7. Measure the voltage for each different length in 10’s
8. Repeat for all measurements up until 100cm three times

Scientific explanation for main test

Resistance of a wire depends on several factors:

• Material,
• Length,
• Thickness,
• Temperature.

Conclusion

Within our experiment we made some mistakes, these may have affected the accuracy of our experiment and the reliability of our conclusion. These mistakes may have affected our results and thus our conclusion; we know that our experiment was reliable and fairly accurate by looking at our graph and error bars this shows that our conclusion must be reliable and account for our experiment with great accuracy.

So overall we know that our experiment and results were of high accuracy and reliability this is confirmed by looking at our graph and averages. This also tells us that our conclusion was reliable but we also do know that we did make some small mistakes and we could have completed the experiment better if we were to do it again.

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

# Related GCSE Electricity and Magnetism essays

1. ## Investigate young's modulus behind Constantan and Copper.

4 star(s)

This is the same principle with the wire, as it was being stretched and the atoms moved out of place, but the load was greater then the elastic limit could handle and this is why there is a permanent deformation where the wire does not return back to it original shape and changes length, resulting in the increase in extension.

2. ## GCSE Physics Coursework - Resistance of a Wire Coursework

4. The power supply is turned on. The voltage and current are then read off the ammeter and voltmeter, and recorded. 5. The power supply is then turned off and the second crocodile clip is moved to the next position. The above steps are completed for each length and then the entire investigation is repeated for accuracy.

1. ## GCSE Physics Coursework - Resistance of a Wire Coursework

4. The power supply is turned on. The voltage and current are then read off the ammeter and voltmeter, and recorded. 5. The power supply is then turned off and the second crocodile clip is moved to the next position. The above steps are completed for each length and then the entire investigation is repeated for accuracy.

2. ## Resistance of a wire - PHYSICS COURSEWORK GCSE

Having obtained my results I will make a new column headed: Resistance. To work this out I will use the formula R=V/I (resistance = voltage / amps). From this new column I will draw a scatter graph plotting the resistance of the wire against the length of the wire.

1. ## Physics Coursework Gravity Investigation

Although the ball doesn't reach its' terminal velocity, the air resistance acts on the ball for longer as the release heights are increased. The ball still accelerates as it falls, however as the release heights get higher, the air resistance has longer to act on the ball and the ball doesn't accelerate as much as would be expected.

2. ## Resistance Coursework

An LDR's (Light dependant resistor) resistance will increase as light becomes brighter. But a thermistor's resistance will increase as the component accumulates heat energy. Below are the symbols for these different types of resistor. I will be using a variable resistor in my circuit.

1. ## --- PHYSICS INVESTIGATION ---

All wire to cool between experiments as temperature effects resistance. 6. Ensure the power supply is switched off before making any alterations to the circuit. PRELIMINARY WORK: Before carrying out the actual experiment, a preliminary test was carried out to find out how the length of a wire affects the resistance.

2. ## Construct and test an anemometer.

Two cups would enable the cups to become aligned in the stream of the wind, and stop moving. Three cups offers the optimum arrangement and ensures that one cup will always be picking up the wind, without creating unnecessary air resistance.

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