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Physics Investigation - Plan

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Introduction

Physics Coursework - PlanJames Bevan

Investigating how the length of wire affects the resistance.

A wire is generally a metal that conducts electricity. Wires are an important aspect of everyday life. It is a simple way of connecting appliances together. They allow electricity to flow to different areas. Electricity is used in just about every appliance; they are often used for easy connection to a plug socket. Wherever there is a wire there is resistance.

Factors:

I expect the following factors to affect the resistance of a wire when I do my experiment, I must make sure I keep these factors constant so I do not get biased and unfair results:

-The temperature of the wire

-The length of the wire.

-Diameter of the wire.

- Material of wire (I am experimenting with Nichrome wires, which is made up of Nickel and Cromine).

- The time in which the experiment is left. This could cause an increase in temperature which will ultimately increase the resistance, which will cause unfair results.

...read more.

Middle

Preliminary work:

I carried out a trial experiment prior to writing.

I set up a circuit using:

  • A power pack (Wier)
  • A voltmeter
  • An ammeter
  • A metre rule
  • A metal wire
  • A resistor

 I used wires and crocodile clips to connect everything together. The voltmeter was connected in parallel to the metal wire and the ruler.  The ammeter was connected in series and the variable resistor was also connected in series, which controls the current. Doing a trial experiment allows me to decide on a suitable voltmeter and ammeter to use in my experiment, it also helps to find an appropriate range of lengths to use; I will use a range of 10.0cm to 100.0cm with intervals of 10.0cm

I will use an ammeter that measures up to

I will use a voltmeter that measures up to

Length (cm)

Current (A)

Voltage (V)

Resistance (  )

10.0cm

0.21A

0.65V

4.66

100.0cm

0.12A

2.35V

42.86

Diagram:

image00.png

Safety:

-The wire gets hot so I won’t leave the power pack on for long.

-I will avoid touching the wire.

...read more.

Conclusion

The temperature of the wire

Control

Only turn on power supply when you record the results.

The diameter of the wire

Control

Use same wire throughout.

The current through the wire

Control

Use same power supply throughout.

Length of wire

Change

Use a metre rule to set the lengths.

Method:

1) I will set up my apparatus as shown in the diagram above.

2) I will measure 10cm from crocodile clip to crocodile clip

3) I will switch on the power supply long enough for me to measure and take down the voltage and current. I will calculate the resistance using this equation:

Resistance= voltage

                  ---------

                  current

I worked this out from Ohms Law, V / IxR.

4) I will carry out the above method for a range of lengths from 10cm to 100cm with an interval of 10cm. I will repeat experiment a minimum of five times to check for consistency, reliability and anonymous results.  

I used wires and crocodile clips to connect everything together. The voltmeter was connected in parallel to the metal wire and the ruler.  The ammeter was connected in series and the resistor was also connected in series, which controlled the current.

...read more.

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