LED Circuit Functionality and Components

LED Circuit Functionality and Components

Assessment

Interactive Video

Science, Computers

7th - 12th Grade

Practice Problem

Hard

Created by

Mia Campbell

FREE Resource

This video tutorial explains how to create an LED blinking circuit using a 555 timer. It covers the necessary components, including resistors and capacitors, and details the setup process. The tutorial discusses how the frequency and duty cycle affect the LED's flash rate and provides a demonstration with calculations. Additionally, it explores advanced configurations, such as using two LEDs to create an AC signal effect.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary component used in the LED blinking circuit discussed in the video?

LM317 Voltage Regulator

555 Timer

PIC Microcontroller

Arduino Microcontroller

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which pin on the 555 timer is not used in the basic LED blinking circuit?

Pin 1 - Ground

Pin 3 - Output

Pin 8 - VCC

Pin 5 - Control Voltage

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the frequency of the LED blinking if the value of R1 is increased?

The frequency increases

The frequency becomes zero

The frequency decreases

The frequency remains the same

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does increasing the capacitance of C1 affect the LED's flash rate?

The flash rate decreases

The flash rate remains constant

The flash rate becomes erratic

The flash rate increases

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the duty cycle if the LED is on for 10 milliseconds and off for 10 milliseconds?

100%

75%

50%

25%

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which components affect the duty cycle in the LED blinking circuit?

VCC and Ground

LED and Resistor

C1 and C2

R1 and R2

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the effect of having R1 much larger than R2 on the duty cycle?

Duty cycle approaches 0%

Duty cycle becomes unpredictable

Duty cycle approaches 50%

Duty cycle approaches 100%

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