Factors that Affect the Current Needed to Melt a Wire
Aim: Investigate one factor that affects the current needed to melt a
wire.
Plan: I am going to investigate what factors affect the current needed
to melt a wire. In this investigation, I have decided to change the
thickness of the wires that I use, and then while increasing the
resistance, I will measure the current needed to melt the different
wires. I will start with the variable resistor set to the maximum. I
will slowly decrease resistance to increase current.
Prediction: I predict that the very thick wires will melt at a very
high current, while the thinner wires will melt at a lower current.
This is because the thick wires have a very large surface area, and
therefore will require a higher current to melt. On the other hand,
the thin wires have a smaller surface area so they will need only a
low current to melt. Below is a graph of the results I expect to get.
[IMAGE][IMAGE]
List of Apparatus:
· Ammeter
· Variable resistor
· Constantan wire
· Connecting wires
· Power pack
I connected the above apparatus in series, using the connecting wires.
Below is a circuit showing this connection.
Below are samples of the wires I used:
Thick wire:
Fairly thick wire:
Thin wire:
Fairly thin wire:
Method: I connected the power pack, ammeter, variable resistor and the
constantan wire in series using the connecting wires. I then set the
ammeter on zero, and then I turned on the power pack. After this, I
set the variable resistor to the maximum, and then slowly decreased
resistance thereby increasing current. I did this until the wire
melted. For the first trial, I used a very thick wire.
I repeated this method, changing the thickness of the wires I used.
The wires became thinner as I continued the investigation. I always
recorded the current needed to melt the different wires, during each
During our investigation we first decided how much sodium bicarbonate we would be using. We decided on 11 grams which was about half of the crucible. We then used the bunsen burner to heat up the sodium bicarbonate. We heated the sodium bicarbonate expecting there to would be a chemical reaction and the atoms would be rearranged during thermal decomposition. We heated the sodium
I also decided to use a wooden block to keep hold of the wire, because
The product obtained was the trans-product. This was decided because the melting point range of the product from recrystallization (200-208 °C) matched closest to the melting point of the trans- product (204 °C). The melting point of the cis-product is only 95 °C.
The oxyacetylene torch is one of the most reliable types of oxy-fuel torches out there. These torches use a combination of oxygen as well as fuel gas (acetylene), to cut and weld metals. Acetylene makes a very hot and steady flame, which can be effectively used to precisely cut or melt
The percent yield was 26%, and the melting point of the product was 170c-172c. According to these results, it can be considered that there are a high range of reactant in the product because the melting point for Ferrocene is 172 and for Acetylferrocene is about 81-83. It is also showed that the product is not pure, and also the TLC was run.
It works by three main ingredients. Electricity, filler metal, and a form of shielding from the air are very important (gowelding para 2). “Just like MIG welding, Flux Core welding works by feeding an electrode continously to the joint” (gowelding para 2).The first step is the welder squeezes the trigger and a spool of wire is fed to the joint into the arc. As soon as the electrode hits the metal it heats it up until the wire and weld area begin to fuse together. Once the puddle is made the Flux Core creates a shield from the air (gowelding para 2). The power supply is a constant voltage power supply. This means the welding machine uses a direct current just like MIG welding, as the same machine is used for both types of
good emitter of heat radiation so a lot of heat will be lost to the
The expected melting point of Semicarbazone of 2-furaldehyde is 202°C.1 It is implied that the product of the high temperature reaction is Semicarbazone of 2-furaldehyde. This is thermodynamic control.
You can make an electric current in a wire if a wire is at right
of the atoms, so if there are more or larger atoms then there must be
The specific heat of copper was calculated to be .425 J/goC by using the relationship of the specific heat of water and copper. The percent error of the aforementioned specific heat of copper is 9.4%. The unknown metal’s specific heat was found to be 1.104 J/goC based on data collected from the experiment, however, the true identity of the unidentified metal was revealed to be Magnesium. Given the identity of the metal, the percent error was found to be 59.33%. This percent error is incredibly high, some potential sources of this high percentage is the nature of the styrofoam cup, in that the cup could not insulate the water very well, allowing the heat energy to not be contained in the cup. Another possible source of error would be human
Investigating the Effect the Thickness of a Wire has on Its Resistance. Equipment:.. Nickel Wire cut into 10 pieces of 30cm length (Ruler, Pliers). Two crocodile clips Five Pieces of Wire Power Source Variable Resistor Ammeter Volt Meter Method: The.. =
Factors Affecting the Resistance of a Wire The aim of this experiment is to investigate one factor that affect the resistance of a wire. I will do this by performing an experiment. First I will need to identify the factors that effect resistance. There are a few factors that affect the resistance, it is determined by the properties an object has.
When we place two objects with different temperatures in contact with each other, the heat from the hotter object will immediately and automatically flow to the colder object. This is known as conduction. Some objects make excellent conductors of heat while others make poor conductors of heat or excellent insulators. Silver, copper, and gold make excellent conductors of heat. Foams and plastics make good insulators of heat but make poor conductors. Last night for dinner, I made myself a grilled cheese sandwich and a bowl of tomato soup. I heated the soup faster than I cooked the sandwich so I poured the hot soup into a bowl and finished cooking the sandwich. Once I was done cooking, I gabbed the soup bowl and burned my hand. The heat from the soup made the bowl hot. This is an example of conduction.
The Relationship Between Length, Width and Resistance of a Wire Aim: To investigate how the length and width of a wire affects the resistance of the wires. What is the resistance to a s Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. gold has less resistance to the sand. For example, gold has more free electrons than. iron and, as a result, it is a better conductor.