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4. What is the output voltage provided by the 7805-voltage regulator IC?
(i) +3V (ii) +9V

(iii) +5V (iv) +12V

5. How do you determine the value of a resistor using color bands?
(i) By counting the number of bands

(ii) By referring to a color-coding table

(iii) By measuring with a multimeter

(iv) By its size

B. State whether the following statements are true (T) or false (F).
1. The cathode of an LED is the positive lead.
2. A potentiometer can be used to control the brightness of an LED.

3. The 7805-voltage regulator IC is used to increase voltage.
4. The longer lead of an LED is the cathode.

5. A potentiometer is used to control the brightness of an LED.
6. Transistors can amplify electrical signals.

C. Fill in the blanks.

Buzzer Red Anode 9 Blue position Green

1. The longer lead of an LED is called the .
2. A is a small device that makes sound when electricity passes through it.

3. RGB stands for , , and .
4. A switch can either be in the ON or OFF .
5. A 7-segment display can show numbers from 0 to .

21 st
Try It Yourself Activity Century #Critical Thinking
#Creativity
Skills
Design a working model of Torch using the understanding of LED with switch circuit.

Scenario: Emma was excited to create her mood light project using an RGB LED and switches. After
completing the circuit, she flipped the switches, but the LED only glowed red, no matter which switch
she pressed. Frustrated, Emma wondered if she had made a mistake in her connections. What steps
should she take to troubleshoot the circuit and identify why the LED isn’t changing colors as expected?
Scenario: Raj built a smart water level monitoring system for his garden. He connected the buzzer
and LEDs to alert him when the water reached certain levels. One day, he noticed that the buzzer
didn’t sound when the water hit the highest level. Concerned about his plants, Raj pondered what
might be wrong. What could he check in his setup to ensure the buzzer activates correctly when the
water level is high?

Electronics with Breadboard-Based Kit 49