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3. When creating a circuit with an RGB LED, which leads must be connected for color mixing?
(i) Only the red lead (ii) All three leads (red, green, blue)

(iii) None of the leads (iv) Only the green lead

4. What is the purpose of using resistors in an LED circuit?
(i) To make the LED brighter

(ii) To prevent too much current from flowing through the LED

(iii) To connect the LED to the breadboard

(iv) To change the LED’s color

5. How do you connect an LED correctly?
(i) Both legs can be connected to any power source

(ii) The longer leg (anode) goes to positive, and the shorter leg (cathode) goes to negative

(iii) The shorter leg (cathode) goes to positive, and the longer leg (anode) goes to negative

(iv) LEDs don’t have legs
B. State whether the following statements are true (T) or false (F).

1. The longer leg of an LED is called the cathode.
2. You can connect multiple components to the same row on a breadboard.

3. Resistors are used in LED circuits to increase the current flowing through the LED.

4. To create a color mix with an RGB LED, you need to connect all three color leads.

5. Breadboards have vertical columns that are used for power connections.

C. Fill in the blanks.
resistor Light Dependent Resistor cathode Resistance anode

1. An LDR, or , is a component that changes its resistance based on the amount of
light it receives.

2. When using a potentiometer, turning the knob changes the of the current flowing
through the circuit.

3. When connecting an LED, the shorter leg is called the , and it connects to the
negative side.
4. The longer leg of an LED is called the , and it connects to the positive side of the
circuit.
5. A is used in an LED circuit to prevent too much current from flowing through the
LED.

Hands-On Electronics with Breadboard-Based Kit 33