EASY

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Assertion: In series combination of electrical bulbs of lower power emits more light than that of higher power bulb.

Reason: The lower power bulb in series gets more current than the higher power bulb.

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Important Questions on Current Electricity

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

Define potential difference.

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

How can a continuous flow of current be obtained? What are the sources of energy and name of the devices required for continuous flow of current?

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

What is the meaning of the statement “The potential difference between two points is

1 V

” ? Name the device used to measure potential difference. What is resistance of a conductor? What is electric power? Write three formulae used to find electric power.

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

The current sensitivity of a moving coil galvanometer depends on,

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

How much work is done in moving a charge of $2 C$ across two points having a potential difference $10 V$ ?

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

Current sensitivity of a moving coil galvanometer is

5 d i v / m A

and its voltage sensitivity (angular deflection per unit voltage applied) is

20 d i v / V

. The resistance of the galvanometer is

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

Write the circuit symbol of p-n-p transistor.

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

Potentiometer wire of length

1 m

is connected in series with

490 Ω

resistance and

2 V

battery. If

0.2 mV

c m^{- 1}

is the potential gradient, then resistance of the potentiometer wire is

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

In the given circuit diagram, identify the objects marked as $1, 2, 3$ .

Question Image

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

How much energy is given to each coulomb of charge passing through a

6 V

battery?

HARD

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

A potentiometer wire,

10 m

long, has a resistance of

40 Ω .

It is connected in series with a resistance box and a

2 V

storage cell. If the potential gradient along the wire should be

0.1 mV {cm}^{- 1}

, the resistance unplugged in the box is

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the building will be:

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

In the following network, the current flowing through

15 Ω

resistance is

Question Image

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

How much work is done in moving a charge of

5 C

across two points having a potential difference

15 V ?

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

In a meter bridge as shown in the figure, it is given that resistance

Y = 12.5 Ω

and that the balance is obtained at a distance

39.5 cm

from end

A

(by jockey

J

). After interchanging the resistances

X

and

Y

a new balance point is found at a distance

l_{2}

from end

A

. What are the values of

X

(in

Ω

) and

l_{2}

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

A potentiometer wire

AB

having length

L

and resistance

12 r

is joined to a cell

D

of emf

ε

and internal resistance

r

. A cell

C

having EMF

ε / 2

and internal resistance

3 r

is connected. The length

AJ

, at which the galvanometer, as shown in the figure, shows no deflection is

Question Image

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

A potentiometer wire is

100 cm

long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at

50 cm

and

10 cm

from the positive end of the wire in the two cases. The ratio of EMF's is :

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

How much work is done in moving a charge of

3 C

across two points having a potential difference

15 V

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

Several lamps of

50 W

and

100 V

rating are available. How many of them can be connected in parallel across a battery of a

120 V

of internal resistance

10 Ω

, so that all bulbs glow in full power?

EASY

Physics>Electricity and Magnetism>Current Electricity>Combination of Cells in Series and Parallel

Four bulbs

B_{1}

B_{2}

B_{3}

and

B_{4}

100 W

each are connected to

220 V

main as shown in the figure. The reading in an ideal ammeter will be

Assertion: In series combination of electrical bulbs of lower power emits more light than that of higher power bulb. Reason: The lower power bulb in series gets more current than the higher power bulb.

Important Questions on Current Electricity

Learn and Prepare for any exam you want !

Assertion: In series combination of electrical bulbs of lower power emits more light than that of higher power bulb.

Reason: The lower power bulb in series gets more current than the higher power bulb.