LED Circuit Basics Quiz

What does LED stand for?

• Light Emitting Device

• Low Energy Diode

• Light Emitting Diode

• Linear Energy Driver

What is the purpose of a resistor in a circuit with an LED?

• To make the light brighter

• To block the current

• To reduce the current so the LED doesn’t burn out

• To change the direction of the current

Which part of the LED is the positive leg (anode)?

• The shorter leg

• The longer leg

• The flat side

• The rounded side

If the LED doesn’t light up, what is the first thing you should check?

• Color of the LED

• Battery size

• Direction of the LED

• Type of wire

What does a resistor look like?

• A round bulb

• A flat chip

• A small cylinder with colored bands

• A thin wire

Why is direction important in an LED circuit?

• LEDs work both ways

• Electricity can only flow one way through an LED

• It changes the color of the LED

• It powers the resistor

What tool is most helpful to build and test circuits easily in class?

• Screwdriver

• Hammer

• Breadboard

• Soldering iron

What happens if you connect an LED without a resistor?

• It blinks faster

• It won’t light up

• It might burn out due to too much current

• It glows more steadily

Where can we commonly see LEDs in everyday life?

• Inside books

• In plant leaves

• Traffic lights, remote controls, indicators

• School bags

Which statement is TRUE?

• A battery is not needed for circuits

• Resistors create electricity

• A circuit must be closed for current to flow

• LEDs only work with AC current