Building Circuits

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Basics of Using a Multimeter Battery Load Test – Tests small batteries DCV – Measures DC Volts ACV – Measures AC Volts Ω – Measures Resistance DCmA – Measures DC Current in mA (0-200mA) ACmA – Measures AC Current in mA (0-200mA) – Tests Diodes – Tests Continuity Between Two Points DC10A – Measures DC Current in MA (0-10A)

We will use Resistors to Build Circuits!

Using the Color Code to Determine Resistance first digit second digit number of zeros tolerance gold = ±5% silver = ±20% color digit black brown 1 red 2 orange 3 yellow 4 green 5 blue 6 violet 7 gray 8 white 9 What is the value of the resistor above? Yellow = 4 Violet = 7 Brown = Add 1 Zero to value Resistor = 470Ω

Measuring Resistance with Multimeter Find a 1,000Ω resistor in your kit. Measure its actual resistance. color digit black brown 1 red 2 orange 3 yellow 4 green 5 blue 6 violet 7 gray 8 white 9

Measure Voltage of Battery Pack Put dial on DCV and connect clips to red & black wires. What is the difference between DCV, ACV, and Battery Load Test?

LEDs = Light Emitting Diode electronic symbol + - Find your red, yellow and green LEDs Electricity can flow one way through an LED (or any diode) Connecting LEDs: Flat edge of the LED lens must be connected to ground The short leg must be connected to ground.

Jumper Wire Set We will use these wires to build circuits.

Experimenting with Breadboards Get these items out of your kit: 3 LEDs 220-ohm resistor 1,000-ohm resistor 10,000-ohm resistor battery pack jumper wire kit breadboard multimeter

Don’t leave it plugged in long!! It gets hot! Connect 220-ohm Resistor Class Problem: Knowing your voltage value and the resistance of your 220Ω resistor, can you determine the current passing through the circuit? 𝑉=𝐼∙𝑅 I V R Don’t leave it plugged in long!! It gets hot!

Build Resistor and LED Circuit Experiment with direction of LED Experiment with location of red wire on breadboard Experiment with location of black wire on breadboard Experiment with location of resistor and LED on breadboard Try the 1,000-ohm resistor instead of the 220-ohm What did you find? Can you figure out how the breadboard works? Are the columns connected? Are the rows connected? Are the rows connected across the gap? Does it matter if the resistor is before or after the LED? 220Ω 9V

How does the breadboard work?

Can You Add a Second LED?

Using the Bus Strip: Measuring Voltage The bus strip makes building circuits much easier since you have so many 5V and ground pins.

Using the Bus Strip: Build Three LED Circuits