Lab #3

The First Steps of Soldering

• Turn on the soldering iron by pressing on the switch
• Turn the dial between 4 and 5 to get a good setting for heat

• Take the soldering iron out of it’s holder
• Check the tip of the iron, if it’s more shiny then it is ready to use, but if it is darkened it should be wiped off and cleaned using a damp sponge
• The soldering iron is ready for use

Before You Step Away from the Soldering Iron

• Clean the tip of the soldering iron by using the sponge to get rid of any residue left from your work.
• Place the soldering iron back into the holder
• Flip the on/off switch to turn the heat on the soldering iron off

Setting the Multimeter

When measuring with the multimeter, you must check three things.

• The dial should be set to the correct setting. In this specific lab, the multimeter should be set to the DC settings.
• The wires of the multimeter should be connected to the correct compartments
• You should measure the voltage of the battery first to have a better reference for your other measurements

Lowest Possible Resistor

Battery Measured Value: 8.62 volts

USING CALCULATED CURRENT

The resistors have a power rating of .25 Watts

.25 Watts / 8.62 Volts = .029 Amps

8.62 Volts / .029 Amps = 293.79 Ohms

USING MEASURED CURRENT

Measured Current: .027 Amps

8.62 Volts / .027 Amps = 319.26 Ohms

The smallest resistor in my resistor kit that I can use is 330 ohms.

Find the Current in Series and Parallel

Battery – 8.62 Volts

R1 – 1k ohms

R2 – 1k ohms

R3 – 2.2k ohms

R4 = 3.3k ohms

1 / ( (1 / 1000) + (1 / 1000) + (1 / 2200) + (1 / 3300) ) = 362.64 ohms

8.62 / 362.64 = .0237 amps

8.62 ‘ 1000 = .0086 amps

8,62 / 2200 = .0039 amps

8.62 / 3300 = .0026

Calculated Values:

I1 – .0236 Amps

I2 – .0086 Amps

I3 – .0086 Amps

I4 – .0039 Amps

I5 – .0026 Amps

I6 – .0237 Amps

Measured Values:

I1 – .024 amps

I2 – .009 Amps

I3. 009 Amps

I4 – .004 Amps

I5 – .003 Amps

I6 – .024 Amos

Trouble Shooting

I had some issues when soldering

• I had some trouble figuring out where to heat the chip, and where to place the solder
• At first I added to much solder and the bulbs were connected together
• I had to melt and scrape/pull some of the saucer out of the chip so the bulbs wouldn’t stick together