Current and Resistance of a Wire and the Affects When the Length Changes
Current and Resistance Physics Investigation
Aim:
Investigate how the length of a wire affects the current and resistance of a wire.
Prediction and Hypothesis:
I think as you increase the length of the Constatan wire, you also increase the amount of resistance. The current is the flow of electrons; the current is dependent on the amount of voltage, which is applied. Voltage is the push given to the current. The current has to go through a circuit, which contains resistance so if you increase that push you also increase the flow of the current. All materials have a slight resistance to electricity factors affecting the resistance are: Length, Voltage & Temperature and Surface Area
Length
The diagram shows the happenings of a wire
the blue dots represent some of the negative
electrons which leads to a lower voltage output,
when the length is increased.
Voltage & Temperature
Temperature has an affect on the experiment as the voltage has control over the temperature. The more the temperature increases the more the particles vibrate leading to a reduction in output voltage although not by a huge amount this does have an affect.
Density
Density has a large affect on the amount of resistance. The resistance depends upon the amount of denseness e.g. a large surface area has less resistance because a small area has tightly packed atoms which in turn rebound many of these electrons.
Apparatus:
· Power Pack
· Constatan wire
· Leads
· Voltmeter
· Ammeter
Method:
1. Arrange apparatus as shown in the Diagram:
2. Cut wires to the following lengths:
· 30cm
· 60cm
· 90cm
· 120cm
· 150cm
3. Attach the wire to the crocodile-clip leads and set voltage to 5 volts or 1.5 Volts
4. Take the reading from the ammeter and record in results table.
5. Repeat 4 times for each length of wire and find the
Aim:
Investigate how the length of a wire affects the current and resistance of a wire.
Prediction and Hypothesis:
I think as you increase the length of the Constatan wire, you also increase the amount of resistance. The current is the flow of electrons; the current is dependent on the amount of voltage, which is applied. Voltage is the push given to the current. The current has to go through a circuit, which contains resistance so if you increase that push you also increase the flow of the current. All materials have a slight resistance to electricity factors affecting the resistance are: Length, Voltage & Temperature and Surface Area
Length
The diagram shows the happenings of a wire
the blue dots represent some of the negative
electrons which leads to a lower voltage output,
when the length is increased.
Voltage & Temperature
Temperature has an affect on the experiment as the voltage has control over the temperature. The more the temperature increases the more the particles vibrate leading to a reduction in output voltage although not by a huge amount this does have an affect.
Density
Density has a large affect on the amount of resistance. The resistance depends upon the amount of denseness e.g. a large surface area has less resistance because a small area has tightly packed atoms which in turn rebound many of these electrons.
Apparatus:
· Power Pack
· Constatan wire
· Leads
· Voltmeter
· Ammeter
Method:
1. Arrange apparatus as shown in the Diagram:
2. Cut wires to the following lengths:
· 30cm
· 60cm
· 90cm
· 120cm
· 150cm
3. Attach the wire to the crocodile-clip leads and set voltage to 5 volts or 1.5 Volts
4. Take the reading from the ammeter and record in results table.
5. Repeat 4 times for each length of wire and find the