MEDIUM

Earn 100

A silicon transistor amplifier circuit is given here. If $β = 100$ , then determine

$(a)$ Base current $I_{B}$

$(b)$ Collector current $I_{C}$

$(c)$ $V_{C E}$

Take the voltage drop between base and emitter as $0.7 V$ .

Important Questions on Current Electricity

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

Two batteries with e.m.f. $12 V$ and $13 V$ are connected in parallel across a load resistor of $10 Ω$ . The internal resistance of the two batteries are $1 Ω$ and $V_{C E} = 5 V$ respectively. The voltage across the load lies between,

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the circuit shown, the current in the

1 Ω

resistor is:

HARD

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

A d.c. main supply of e.m.f.

220 V

is connected across a storage battery of e.m.f.

200 V

through a resistance of

1 Ω

. The battery terminals are connected to external resistance

R

. The minimum value of

R

, so that a current passes through the battery to charge it is:

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the given circuit the internal resistance of the

18 V

cell is negligible. If

R_{1} = 400 Ω, R_{3} = 100 Ω

and

R_{4} = 500 Ω

and the reading of an ideal voltmeter across

R_{4}

5 V,

then the value of

R_{2}

will be:

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the electric network shown, when no current flows through the

4 Ω

resistor in the arm EB, the potential difference between the points A and D will be:

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MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the given electrical circuit, which one of the following equation is a correct equation?
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EASY

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the above circuit the current in each resistance is:

EASY

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

Two resistors

400 Ω

and

800 Ω

are connected in series across a

6 \lor

battery. The potential difference measured by a voltmeter of

10 kΩ

across

400 Ω

resistor is close to:

HARD

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

A letter '

A

' is constructed of a uniform wire with resistance

1.0 Ω {c m}^{- 1} .

The sides of the letter are

20 c m

and the cross-piece in the middle is

10 c m

long. The apex angle is

60^{o} .

The resistance between the ends of the legs is

EASY

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

The potential difference $(V_{A} - V_{B})$ between the points $A$ and $B$ in the given figure is
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EASY

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the given circuit diagram, the currents,

I_{1} = - 0.3 A, I_{4} = 0.8 A

and

I_{5} = 0.4 A,

are flowing as shown. The currents

I_{2}, I_{3}

and

I_{6},

respectively, are:

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HARD

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

The actual value of resistance

R

, shown in the figure is

30 Ω .

This is measured in an experiment as shown using the standard formula

R = \frac{V}{I}

, where

V

and

I

are the readings of the voltmeter and ammeter, respectively. If the measured value of

R

5 %

less, then the internal resistance of the voltmeter is:

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MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the given circuit diagram, a wire is joining points

B

and

D

. The current in this wire is:
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MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

For the circuit shown, with

R_{1} = 1.0 Ω

R_{2} = 2.0 Ω

E_{1} = 2 V

and

E_{2} = E_{3} = 4 V,

the potential difference between the points

‘ a ’

and

‘ b ’

is approximately (

i n V

EASY

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

Kirchhoff's junction rule is a reflection of

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Kirchhoff's Laws with Resistors

In the circuit, given in the figure currents in different branches and value of one resistor are shown. Then potential at point $B$ with respect to the point $A$ is:

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