When a body is earthed, electrons flow from the earth into the body. This means the body is
as electrons will move to neutralize the positive charge on the body.
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The total resistance of three parallel resistors is
The formula of parallel circuit is 1/RT = 1/R1 + 1/R2 + 1/R3
Which of the following is an ohmic conductor? A) Germanium B) Silicon C) Carbon D) Silver
The correct option is D) Silver. An ohmic conductor is defined as a two-terminal device in which the voltage or... View Article
1 ohm is equal to_________
Answer: 1 ohm is equal to one volt (V)/ one ampere (1A) 1 Ohm is defined as the resistance of a... View Article
Two cells of 1.25 V and 0.75V are connected in parallel. The effective voltage will be
Using Kirchoff’s rules we can see that the voltage available = V1 – V2 = 0.5 V
How EMF is measured?
E.M.F. (electromotive force) is the total energy supplied by a cell to move a unit of charge through the complete circuit,... View Article
Which of the following is true for a forward-biased diode?
In a forward-biased diode, the anode is more positive with respect to the cathode.In forward biasing the positive terminal of... View Article
A photodiode is used preferably in
A photodiode is used preferably in in reverse bias condition because the change in reverse current through the photodiode due to change... View Article
P-type material is created by using a dopant from group:
P-type material is created by using a dopant from group.
Which of the statements is true for p-type semiconductors? (a) Electrons are the majority carriers and trivalent atoms are the dopants. (b) Holes are the majority carriers and trivalent atoms are the dopants. (c) Holes are the majority carriers and pentavalent atoms are the dopants. (d) Electrons are the majority carriers and pentavalent atoms are the dopants
The correct option is (b) Holes are the majority carriers and trivalent atoms are the dopants. In a p-type semiconductor hole... View Article
N-type material is created by using a dopant from group:
N-type material is created by using a dopant from group V.
Induction furnace makes use of:
Induction furnace makes use of eddy currents. Induction furnace has an alternating electric current-carrying coil surrounding the container. Eddy currents... View Article
In an unbiased p-n junction, holes diffuse from the p-region to the n-region because (1) Free electrons in the n-region attract them. (2) They move across the junction by the potential difference. (3) Hole concentration in p-region is more as compared to n-region. (4) All of the above.
Answer: (3) Hole concentration in p-region is more as compared to n-region. A p-n junction is an interface or a boundary... View Article
The diode current depends on which of the following:
The diode current depends on the diode voltage, temperature, and reverse saturation current
What is Electromotive force?
Electromotive force, most commonly known as emf, is the energy per unit electric charge that is imparted by an energy source,... View Article
In a semiconductor , the energy gap between valence band and conduction band is about
In semiconductor there is small energy gap about 1 eV between valence band and conduction band.
The internal resistance of dry cells is ________than the common electrolytic cells.
The internal resistance of dry cells is higher than the common electrolytic cells. Reason They generally have high internal resistance... View Article
In a semiconductor, current conduction is due_________
Answer: In a semiconductor, current conduction is due to both holes and electrons. Semiconductors Semiconductors are the materials which have... View Article
A car battery has _______resistance than a dry cell.
a car battery of 12V provides a current of about 200A, which is the current needed to operate a starter... View Article
What is the order of forbidden gap in the energy bands of silicon?
It is of the order of 1.1 eV.
