Use of a multimeter to see the unidirectional flow of current in case of a diode and an LED and check whether a given electronic component (eg, diode) is in working order.
Answers
Answer:
To use a multimeter to (a) identify base of transistor, (b) distinguish between npn and pnp type transistors, (c) see the unidirectional flow of current in case of a diode and an LED, (d) check whether a given electronic component (e.g., diode, transistor or IC) is in working order
December 3, 2016 by Sastry CBSE
To use a multimeter to (a) identify base of transistor, (b) distinguish between npn and pnp type transistors, (c) see the unidirectional flow of current in case of a diode and an LED, (d) check whether a given electronic component (e.g., diode, transistor or IC) is in working order
Aim
To use a multimeter to:
(a) identify base of transistor
(b) distinguish between npn and pnp type transistors.
(c) see the unidirectional flow of current in case of a diode and an LED.
(d) check whether a given electronic component (e.g., diode, transistor or IC) is in working order.
Apparatus
A multimeter, transistors, npn and pnp, an IC (integrated circuit 7408 or 7432 each with 14 legs), a diode and an LED.
Theory
A transistor is a three terminal device. It can be regarded as a combination of two junction diode joined in an opposite manner such that the middle part is common to both. When an n-type of semi-conductor is sandwitched between two p-type of semiconductors, the transistor is p-n-p type but when p-type of semi-conductor, the transistor is npn transistor. Input section is forward biased and output section of a transistor is reversed biased. The base current is small but emitter and collector current is large. Ic = Ib + Ic.
(a) Identify the base: If one of the three terminals of the transistor is so chosen that conduction take place in both the cases when a multimeter is connected between the chosen terminal and either of the remaining two terminals, then the chosen terminal is the base.
(b) To find out whether the transistor is p-n-p or n-p-n: For conduction to be possible in both the above said cases, if the common terminal of the transistor has to be
connected to +ve, then the transistor is n-p-n type. But if the common terminal
Answer:
I
Explanation:
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