5,710
edits
Changes
New page: = Lab 2 - Voltage, Current, Resistance = == Topics == * Electricity flow. * Voltage, Current, Resistance. * SI units. (Volts, Amperes, Ohms) == Supplies == * 4 6V bulbs [http://www.jameco....
= Lab 2 - Voltage, Current, Resistance =
== Topics ==
* Electricity flow.
* Voltage, Current, Resistance.
* SI units. (Volts, Amperes, Ohms)
== Supplies ==
* 4 6V bulbs [http://www.jameco.com/Jameco/Products/ProdDS/210008.pdf datasheet] "MSCP" stands for "Mean Spherical Candlepower" [http://www.electrical-online.com/lightingterminology.htm] p. 507 Scherz.
* 4 1K resistors. (Brown-Black-Red. for reference see the inside of the second page in Scherz)
* 12 V power supply
* LM7805 5V regulator [http://www.fairchildsemi.com/ds/LM/LM7805.pdf datasheet]
* wire clippers, wire strippers, pliers.
* multimeter
* red and black hookup wire
== Activities ==
=== Set up your 5V power supply===
* set up voltage regulator
[[Image:7805_schematic.png | 350px | thumb | left ]]
[[Image:7805_pinout.png | 200px | thumb | left]]
[[Image:7805_on_breadboard.jpg | 300px | thumb | left]]
* light bulb as indicator (always-on power indicator)
[[Image:7805_schematic_w_bulb.png | thumb | left]]
[[Image:7805_with_power_light.jpg | 200px | thumb |left]]
*QUESTIONS:
**what is the voltage across the bulb?
**what is the voltage across the input to the voltage regulator?
**what is the voltage across the output from the voltage regulator?
**how much current is flowing through the bulb? according to the [http://www.jameco.com/Jameco/Products/ProdDS/210008.pdf datasheet] how much current should the bulb draw?
=== bulb circuits===
* Scherz p 49. 2.11 Electric Circuits.
[[Image:Four_series_of_bulbs.png | 200px]]
[[Image:Parallel_bulbs.png | 200px]]
[[Image:Mixed_bulbs.png | 200px]]
=== resistor circuits===
* resistors
[[Image:Resistor_series.png | 200px]]
[[Image:Resistor_parallel.png | 200px]]
[[Image:Resistor_mixed.png | 200px]]
* potentiometer
[[Image:Potentiometer.png | 200px]] [[Image:Potentiometer_w_bulb.png | 200px]]
* power rating: DONT TRY THIS AT HOME, ONLY IN LAB!
**1/4 Watt = 0.25 Watt.
**P=I*V. P=I*5V. 10 Ohm resistor.
== Topics ==
* Electricity flow.
* Voltage, Current, Resistance.
* SI units. (Volts, Amperes, Ohms)
== Supplies ==
* 4 6V bulbs [http://www.jameco.com/Jameco/Products/ProdDS/210008.pdf datasheet] "MSCP" stands for "Mean Spherical Candlepower" [http://www.electrical-online.com/lightingterminology.htm] p. 507 Scherz.
* 4 1K resistors. (Brown-Black-Red. for reference see the inside of the second page in Scherz)
* 12 V power supply
* LM7805 5V regulator [http://www.fairchildsemi.com/ds/LM/LM7805.pdf datasheet]
* wire clippers, wire strippers, pliers.
* multimeter
* red and black hookup wire
== Activities ==
=== Set up your 5V power supply===
* set up voltage regulator
[[Image:7805_schematic.png | 350px | thumb | left ]]
[[Image:7805_pinout.png | 200px | thumb | left]]
[[Image:7805_on_breadboard.jpg | 300px | thumb | left]]
* light bulb as indicator (always-on power indicator)
[[Image:7805_schematic_w_bulb.png | thumb | left]]
[[Image:7805_with_power_light.jpg | 200px | thumb |left]]
*QUESTIONS:
**what is the voltage across the bulb?
**what is the voltage across the input to the voltage regulator?
**what is the voltage across the output from the voltage regulator?
**how much current is flowing through the bulb? according to the [http://www.jameco.com/Jameco/Products/ProdDS/210008.pdf datasheet] how much current should the bulb draw?
=== bulb circuits===
* Scherz p 49. 2.11 Electric Circuits.
[[Image:Four_series_of_bulbs.png | 200px]]
[[Image:Parallel_bulbs.png | 200px]]
[[Image:Mixed_bulbs.png | 200px]]
=== resistor circuits===
* resistors
[[Image:Resistor_series.png | 200px]]
[[Image:Resistor_parallel.png | 200px]]
[[Image:Resistor_mixed.png | 200px]]
* potentiometer
[[Image:Potentiometer.png | 200px]] [[Image:Potentiometer_w_bulb.png | 200px]]
* power rating: DONT TRY THIS AT HOME, ONLY IN LAB!
**1/4 Watt = 0.25 Watt.
**P=I*V. P=I*5V. 10 Ohm resistor.
