Multi-LED circuit design - LED Parallel Circuits

The video tutorial explains how to connect LEDs to a 9V battery, focusing on calculating the necessary resistor values to ensure proper voltage and current for each LED. It covers both series and parallel connections, highlighting the importance of using the same color or rating LEDs in parallel circuits. The tutorial also discusses the impact of different LED colors on voltage drop and resistor selection, and provides calculations for determining battery runtime based on current usage.

What is the resistor value needed for each LED when connecting 6 LEDs to a 9 Volt battery, given each LED has a voltage drop of 2 volts and requires 20 milliamps?

• 150 ohms

• 250 ohms

• 450 ohms

• 350 ohms

How long will the battery last when using 6 LEDs with a total current of 120 milliamps and a battery capacity of 500 milliamp hours?

• 8 hours

• 2 hours

• 4 hours

• 6 hours

What is the resistor value for a blue LED with a voltage drop of 3.4 volts when connected to a 9 Volt battery?

• 280 ohms

• 300 ohms

• 350 ohms

• 400 ohms

When connecting LEDs in parallel, why is it important to use LEDs with the same voltage drop?

• To reduce power consumption

• To ensure they all illuminate

• To prevent overheating

• To ensure they all have the same brightness

What is the power rating of the resistor needed when connecting three red LEDs in parallel, each requiring 20 milliamps?

• 1/4 Watt

• 2 Watts

• 1/2 Watt

• 1 Watt