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Circuit Diagram and Commonly Used Symbols

The given gra...

Question

The given graph represents $V - I$ characteristic for a semiconductor device.
Which of the following statement is correct?

A

it is for

V - I

characteristic for solar cell where, point

A

represents open circuit voltage and point

B

short circuit current.

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B

It is for solar cell and point

A

and

B

represents open circuit voltage and current respectively.

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C

It is for a photodiode and points

A

and

B

represents open circuit voltage and current, respectively.

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D

It is for a

L E D

and points

A

and

B

represents open circuit voltage and short current, respectively.

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Similar questions

Q. A cell has terminal voltage

2 V

in open circuit and internal resistance of the given cell is

2 Ω

4 A

of current is flowing between points

P

Q

in the circuit and then the potential difference between

P

Q

Q. In an experiment to find the equivalent resistance of two resistors connected is series, a student used the circuit shown:
This circuit will give :

(1) correct reading for voltage V but incorrect reading for current I
(2) correct reading for current I but incorrect reading for voltage V
(3) correct reading for both voltage V and current I
(4) Incorrect readings for both current I and voltage V

Q. In the circuit shown all five resistors have the same value

200 Ω

and each cell has an emf

3 v o l t s .

Find the open circuit voltage and the short circuit current for the terminals

A

B .

Q. Open circuit voltage of a source is 7.86 V and its short circuit current is 9.25 A. Find the current when an external resistance of

2.4 Ω

Q. Note that for nearly all materials the current - voltage relation is temperature dependent. Thus at low temperatures the curve in Fig.

(a)

rises more steeply for positive

V

than at higher temperatures, and at successively higher temperatures the asymmetry in the curve becomes less and less pronounced.
The current - voltage relation for a source may also be represented graphically. For a source represented by

V_{a b} = E - I r

V = E - I r

, The graph appears in Figure

(b)

. The intercept on the

V -

axis, corresponding to the open circuit condition

(I = 0)

V = E

, and the intercept on the

I -

axis, corresponding to a short-circuit situation

(V = 0)

I = \frac{E}{r}

.
This relation may be used to find the current in a circuit containing a non linear device, as in fig

(c)

. Its current voltage relation is shown in fig

(d)

and terminal voltage

V = E - I r

is also plotted on this graph, each curve represents a current-voltage relation that must be satisfied, so the intersection represents the only possible values of

V

I

. This amounts to a graphical solution of two simultaneous equation of

V

I

, one of which is nonlinear.
When a device has a nonlinear voltage-current relation, the quantity

\frac{V}{I}

is not constant. This ratio may still be called resistance, but now it varies with current; it is constant only for a device obeying Ohm's law. Often a more useful quantity is

\frac{d V}{d I}

, which expresses the relation between a small change in current and the resulting voltage change. This is called dynamic or incremental resistance. Which of the following vacuum tube devices shows negative resistance?

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