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Assertion: Electrical power go off when a short circuit happens.

Reason: When short circuit happens, then resistance of circuit become very high.

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Important Questions on Current Electricity

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

A current of $0.1 A$ flows through a $25 Ω$ resistor represented by the circuit diagram. The current in the $80 Ω$ resistor is:

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

In the circuit shown, the current in the

1 Ω

resistor is:

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

Consider the circuit shown in the figure below:
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All the resistors are identical. The ratio

\frac{I}{I^{'}}

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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:

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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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EASY

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

In the circuit, wire $1$ is of negligible resistance. Then

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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:

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:

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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HARD

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

The figure below shows a circuit and its input voltage $V_{i}$ as a function of time $t$ .

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Assuming the diodes to be ideal, which of the following graphs depicts the output voltage $V_{o}$ as function of time $t ?$

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

Consider the circuit shown below where all resistors are of

1 kΩ .

If a current of magnitude,

1 mA

flows through the resistor marked

X

, what is the potential difference measured between points

A

and

L

EASY

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

For a diode connected in parallel with a resistor, which is the most likely current $(I)$ -voltage $(V)$ characteristic graph?

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

The series combination of two batteries, both of the same emf

10 V,

but different internal resistance of

20 Ω

and

5 Ω,

is connected to the parallel combination of two resistors

30 Ω

and

x Ω .

The voltage difference across the battery of internal resistance

20 Ω

is zero, the value of

x

(in

Ω)

is____

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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 $2 Ω$ respectively. The voltage across the load lies between,

MEDIUM

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

Which of the following statements is false?

EASY

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

In the given figure, a diode

D

is connected to an external resistance

R = 100 Ω

and an

e m f

3.5 V

If the barrier potential developed across the diode is

0.5 V

, the current in the circuit will be

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MEDIUM

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

In the given circuit the cells have zero internal resistance. The currents (in amperes) passing through resistance

R_{1}

and

R_{2}

respectively, are:

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Assertion: Electrical power go off when a short circuit happens. Reason: When short circuit happens, then resistance of circuit become very high.

Important Questions on Current Electricity

Learn and Prepare for any exam you want !

Assertion: Electrical power go off when a short circuit happens.

Reason: When short circuit happens, then resistance of circuit become very high.