A resistor X of 9 Ω is connected with the resistor Y of ' a ' Ω . If the resultant resistance of the parallel combination is 7.2 Ω , then what will be the value of ' a ' ?

Given, X = 9 Ω Y = a Ω As the combination is in parallel, R = X Y X + Y 7 .2 = 9 × a 9 + a 64 .8 + 7 .2 a = 9 a 1 .8 a = 64 .8 a = 36 Y = 36 Ω

EASY

10th CBSE

IMPORTANT

Earn 100

How does current vary with potential difference applied to a wire? Show the variation graphically.

Important Questions on Electricity

MEDIUM

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 7

If in a household,

6

tube lights of

40 W

each are used for

6 hr

and an electric iron of

500 W

for

5 hr

every-day, then how would you calculate the total electrical energy consumed by the tube lights and the iron in a month of

30

days?

EASY

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 8

A resistor

X

9 Ω

is connected with the resistor

Y

' a' Ω

. If the resultant resistance of the parallel combination is

7.2 Ω

, then what will be the value of

' a'

EASY

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 9

You are given two wires of the same material having lengths in the ratio of

1 : 2

and diameters in the ratio

2 : 3

are joined in series, then how would you calculate the ratio of potential difference across the two wires.

EASY

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 10

Draw a circuit diagram showing

3

bulbs lit from a battery in such a way that

2

bulbs are controlled by the same switch while the third has its own switch.

EASY

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 11

If a wire of length

' L'

and resistance

' R'

is stretched so that its length is doubled and the area of cross-section is halved, then how will its resistance and resistivity change?

EASY

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 12

If an electric kettle has resistance of

100 Ω

, a toaster of resistance

50 Ω

and a water heater of resistance

500 Ω

are connected in parallel to a

220 V

source, then what would be the resistance of an electric iron connected to the same source that takes as much current as all the three appliances? What will be the current passing through it?

MEDIUM

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 13

When

200 W

bulb is burnt for

4

hours, a

1200 W

heater is used for

3

hours per day, then determine the energy consumed per day and the cost of electricity in a month of

30

days if the cost per unit is

₹ 3.00

EASY

10th CBSE

IMPORTANT

Concise Physics A Textbook of Science for Class X>Chapter 3 - Part -1>Electricity>Q 14

How would you calculate the heat produced when

96000 C

of charge is transferred in an hour through a potential difference of

50 V

How does current vary with potential difference applied to a wire? Show the variation graphically.

Important Questions on Electricity

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