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Learning about Electrical Components

Learning about Electrical Components. ES 110. Basic Components. Function generator LED Relay Speaker Pot Ohm ’ s Law Drawing the circuit Schematic capture: http://phet.colorado.edu/simulations/sims.php?sim=Circuit_Construction_Kit_ACDC. Relay.

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Learning about Electrical Components

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  1. Learning about Electrical Components ES 110

  2. Basic Components • Function generator • LED • Relay • Speaker • Pot • Ohm’s Law • Drawing the circuit • Schematic capture: http://phet.colorado.edu/simulations/sims.php?sim=Circuit_Construction_Kit_ACDC

  3. Relay • A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used.

  4. Different Types of Relays An SPST relay (Single Pole Single Throw) simply opens or closes a signal path. This relay is typically normally open when power is removed, and the relay needs to be energized in order to connect the signal path. A DPST relay (Double pole Single Throw) is in essence two SPST relays but energized from the same coil. A SPDT (Single Pole Double Throw) relay has one normally open and one normally closed path and a DPDT (Double Pole Double Throw) relay is in essence two SPDT relays which are energized from the same coil.

  5. Part I: Connecting a Relay What is the minimum voltage required to turn on the relay?

  6. Part 2: Photoresistor • A photoresistor is a sensor whose resistance varies with light intensity.  Most decrease in resistance as the light intensity increases. 

  7. Part 2: Photoresistor • Using Excel plot Voltage vs. Resistance of the photo resistor. Is it linear? • Using MSWord draw your circuit (as shown below) • Include the table in your report • What are the potential applications of a photoresistor? • Redraw the following circuit and explain what it does.

  8. Part 3: Make the following measurements: • Adjust the generator so you see a 2V peak-to-peak square wave signal with frequency of 8.5 KHz. DON’T forget UNITS! • Take a snapshot of the signal (your snapshot must contain at least 2 cycles of the signal)- Use the figure in the previous slide. • On you snapshot indicate how you measure Vpp, DC voltage (also called the offset), and the period (as shown the previous slide). Watch the video for more information. • Use MSWord Equations to calculate the frequency of the signal from your plot. Show all your work. • What is Vp of this signal? • Take another snapshot of the signal. This time make sure you set the voltage cursers to show the Vpp.

  9. Part 4: Connect Photo Resistor to the Relay and Turn on the Siren! GND 5V 1

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