Day 24 - AC Circuits

Day 23 - Inductors

Day 22 - Solenoids and Magnetic Fields

Day 21- Magnetic Field of the earth

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The makeshift contraption above was used in order to determine the magnetic field of the earth.

Our group used what we knew about the Biot-Savart Law in order to calculate the magnetic field of the coil using the current, radius, number of turns, and the constant given. The relationship between the magnetic field from the earth and coil were used to determine this field. We based our calculation of the field based on the direction the compass was pointing, measured approximately in degrees. W had a known current and solved for the earth's field by dividing the coil's field by the tangent theta. The graph of the coil's field vs tangent theta is given below:

We used a general line of best fit and the slope was 1.055*10^-5 T

 

Day 20 - Motors & Magnetic Field Lines

Magnetic Motor Lab

Attaching the power supply to the motor caused it to spin.

Reversing the current's direction causes it to spin in the opposite direction.

Our Motor

The motor that our group created was composed of copper wire, several magnets and paperclips, and a power supply. A symmetrical oval shape was formed from the wire. One lead was sanded down 360 degrees while the other lead was sanded down half that amount. The paper clips were used as mounting points for the copper wire and placed on the top of the cup, and a magnet was placed inbetween the contraption as shown above. The current from the power supply is what moves the current through the wire and causes it to turn.

Day 19 - Magnetic Field

Magnetic field about a bar

We used a compass in order to find the magnetic north of the magnet. We indicated where the north and south poles were, and drew arrows around the magnet to represent the direction of the magnetic field. 

  

Visual representation of Magnetic field with ancient technology.

Magnetic Field and Rod

Attempt at solving for the magnetic field B for the metal rod. The units did not work out very well.

Magnetic Field with rotation

Calculation of Magnetic Field

Day 18 - Diodes and Transistors

We were able to create an amplifier on the breadboard shown below, according to the diagram shown above:

This breadboard set up created an amplifier that increased a 3,000Hz wave at 0.3 V with a transistor of 2N3904

This resulted in a 100 times amplification from the original.  The two waves on the screen are the wave being emitted by the function generator, as well as the amplification from the breadboard. The original voltage was 0.3 and the new one was 20-30 V.

We created the amplifier below based on the diagram shown above, using an LM386 audio amplifier

This set up finally did produce sound that we streamed from an alternative rock soundtrack from Bianca's phone, but it was mainly static.