May 26 4
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This document outlines activities for a workshop on electricity. Students are instructed to watch instructional videos to learn definitions of key terms like electricity and circuits. They are asked to draw simple circuits, copy circuit component symbols, and define series and parallel circuits. Finally, students are assigned to build sample series and parallel circuits using batteries, bulbs, motors, switches, and observe how opening and closing switches affects the circuits.
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To control one lamp with one switch.
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The document describes an investigation using a battery, light bulb, aluminum foil, and clothespin to create a simple circuit. Students are asked to experiment with connecting the components and record their observations. The activity aims to have students explain that electricity flows through a complete circuit from the battery to the light bulb, lighting it up, and discuss that the battery provides electricity, while the aluminum foil and clothespin create a path for the electricity to flow through and light the bulb.
Real Analog - Circuits 1Chapter 1 Lab WorksheetsReal Analog – .docx
Real Analog - Circuits 1Chapter 1: Lab Worksheets
Real Analog – Circuits 1Chapter 1.4.1: Dusk-to-dawn Light
1.4.1: Dusk-to-dawn Light (20 points total)
1. Provide below the calculated values of VB for photocell resistances of 5K and 20K. (5 pts)
2. Provide below measured values of VB for photocell resistances of 5K and 20K and comparison with calculated values. (8 pts)
3. DEMO: Have a teaching assistant initial this sheet, indicating that they have observed your circuits’ operation. (7 pts)
TA Initials: _______
© 2012 Digilent, Inc.
1
© 2012 Digilent, Inc.
2
Real Analog - Circuits 1
Chapter 1: Lab Projects
© 2012 Digilent, Inc. 1
1.4.1: Dusk-to-Dawn Light
Overview:
In this lab, we will create our first circuit which appears to “do” something which is readily perceivable without
instrumentation. The circuit operates as a “dusk-to-dawn” light; the circuit turns a light on when the ambient
light level goes below a certain level.
Before beginning this lab, you should be able to: After completing this lab, you should be able to:
State Ohm’s law from memory
Use Ohm’s law to perform voltage and
current calculations for resistive circuit
elements
Use a digital mulitmeter to measure
resistance, current, and voltage (Labs 1.1,
1.2.1)
Use transistors as dependent sources (Lab
1.2.2)
Use color codes on resistors to determine
the resistor’s nominal resistance
State KVL and KCL from memory
Use a bipolar junction transistor (BJT) as a
dependent source
Use a photoresistor to measure ambient light
levels
Use an LED as a light source
Integrate a number of components into an
overall system
This lab exercise requires:
Analog Discovery module
Digilent Analog Parts Kit
Digital multimeter (optional)
Symbol Key:
Demonstrate circuit operation to teaching assistant; teaching assistant should initial lab notebook and
grade sheet, indicating that circuit operation is acceptable.
Analysis; include principle results of analysis in laboratory report.
Numerical simulation (using PSPICE or MATLAB as indicated); include results of MATLAB
numerical analysis and/or simulation in laboratory report.
Record data in your lab notebook.
Real Analog – Circuits 1
Lab Project 1.4.1: Dusk-to-Dawn Light
© 2012 Digilent, Inc. 2
General Discussion:
In this part of the lab assignment, we will create a light-sensitive lighting system. A photocell – a light-sensitive
resistor – will be used to sense the ambient light level. A Bipolar Junction Transistor (BJT) will be used as a switch
to turn on a light-emitting diode when the ambient light level becomes low. The circuit we will use is shown in
Figure 1.
Figure 1. Dusk-to-dawn lighting circuit.
There are several unfamiliar components in the circuit of Figure 1: a photocell, an LED, and a BJT. A detailed
understanding of the operation of these components is beyond the scope of this lab, but a brief overview of their
operating characteristics is provided be ...
Simple circuit with activity
Here are the steps to find the relationship between voltage, resistance, and current in a circuit:
1. Construct a simple circuit using the materials provided with one dry cell, one resistor, and connecting wires. Use alligator clips to securely connect the components.
2. Use a multimeter to measure the voltage of the dry cell. Record this value.
3. Measure the resistance of the resistor. Record this value.
4. Connect the multimeter in series with the resistor to measure the current. Record this value.
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