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Description : Draw symbol of NPN and PNP transistors. 

Answer : symbol of NPN and PNP transistors

Description : Define resistor and draw symbol of variable resistor.

Answer : Resistor: A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Symbol of variable resistor:   

Description : Draw symbol & V-I characteristics of (i) LASCR (ii) DIAC (iii) TRIAC

Answer : (i) LASCR:  (ii) DIAC:  (iii) TRIAC: 

Description : Draw the symbol of LED & photodiode. 

Answer : Symbol of LED & photodiode

Description : Electrical quantities (symbol and basic unit)

Answer : Electrical quantities (symbol and basic unit)

Description : Draw symbol of LED and explain it’s working principle.

Answer : Construction of LED: The basic structure of LED is shown in fig.(a). The active region exists between the p and n regions. The light emerges from the active side in all the directions when electron hole-pairs ... fig.(c). In this way an LED emits light. This is the principle of operation of LED.

Description : What is photodiode? Draw the symbol and explain operation of photodiode. 

Answer : A photodiode is a light detector that converts light into an electrical current. A photodiode is a semi-conductor device, with a p-n junction and an intrinsic layer between p and n layers ... current is independent of reverse bias voltage. Reverse current is mostly depends on the light intensity.

Description : What is the symbol of a capacitor?

Answer : symbol of a capacitor

Description : What is the symbol of acceleration?

Description : What is the symbol for AC power?

Answer : If you need to measure alternating current in a circuit, different multimeters have different symbols to measure it (and the corresponding voltage), usually "ACA" and "ACV," or "A" and "V" with a squiggly line (~) next to or above them.

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