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# Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Ohm's Law and Electric Circuits

## Frank Textbook Solutions Chapter Unit - 4 - Current Electricity - Ohm's Law and Electric Circuits

Frank Textbook Solutions are considered extremely helpful for solving difficult questions in the ICSE Class 10 Physics exam. TopperLearning Textbook Solutions are compiled by our subject experts. Herein, you can find all the answers to the questions of   Chapter Unit - 4 - Current Electricity - Ohm's Law and Electric Circuits for the Frank textbook.

Frank Textbook Solutions for class 10 are in accordance with the latest ICSE syllabus, and they are amended from time to time to be most relevant. Our free Frank Textbook Solutions for ICSE Class 10 Physics will give you deeper insight on the chapters and will help you to score more marks in the final examination. ICSE Class 10 students can refer to our solutions while doing their homework and while preparing for the exam.

Exercise/Page

## Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Ohm's Law and Electric Circuits Page/Excercise 187

Solution 1

An electric cell is a device in which a constant difference in potential is maintained between the two conductors by a chemical reaction. Thus, a cell can be used as a source of electrons or current. In a cell, chemical energy changes into electrical energy when it is in use.

Solution 2

Solution 3

An electrical circuit is a continuous path comprising of conducting wires and resistances between the terminals of a battery, along which an electric current is set up. It is represented by drawing a circuit diagram.

Solution 4

Solution 5

A diagram indicating how various components in an electrical circuit have been connected using symbols for those components is a circuit diagram.

Solution 6

In the given diagram, ammeter is connected in parallel and voltmeter in series, which is wrong. Also the terminals of the two devices are wrongly connected to the battery.
Correct diagram:

Solution 7

According to Ohm's law, the current flowing in a conductor is directly proportional to the potential difference across its ends provided the physical conditions and temperature of conductor remains constant.
No, it is not always true. E.g. Diode valve, junction diode etc. do not obey Ohm's law.

Solution 8

The obstruction offered to the flow of current by the wire is called its electrical resistance. It is a kind of friction between the free electrons and the atoms of the conductor along which they flow.
Its SI unit is 'ohm'.

Solution 9

The physical quantity is 'resistance'.

Solution 10

Resistance of a conductor is said to be 1 ohm, if 1 ampere current flows through it, when the potential difference across its ends is 1 volt.

Solution 11

No, Ohm's law does not hold good for semiconductors and electrolytic solutions.

Solution 12

Factors on which the resistance of a conductor depends are:
(i) Nature of conductor: different materials have different concentration of free electrons and therefore resistance of a conductor depends on its material.
(ii) Length of conductor: Resistance of a conductor is directly proportional to the length of a conductor.
(iii) Area of cross-section of a conductor: Resistance of a conductor is inversely proportional to the area of cross-section of the uniform wire.
(iv) Temperature of conductor: In general for metallic conductors, higher the temperature larger is the resistance.

Solution 13

An equivalent resistor is that resistor which when replace any combination of resistors the current through the circuit is not altered or changed.

Solution 14

Solution 15

The slope of the graph (dV/dI) gives the value of resistance.

Solution 16

The resistivity of a material is the resistance of a wire of that material of unit length and unit area of cross-section.

Solution 17

Solution 18

Conductance of a conductor is the reciprocal of resistance of that conductor. Its unit is mho.

Solution 19

(i) Metals e.g. copper
(ii) Alloys e.g. Constantan
(iii) Semiconductors e.g. Germanium

Solution 20

## Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Ohm's Law and Electric Circuits Page/Excercise 188

Solution 21

Ohm's law relates the current in a conductor to the potential difference across its ends.
According to Ohm's law, the current flowing in a conductor is directly proportional to the potential difference across its ends provided the physical conditions and temperature of conductor remains constant.

Solution 22

If the conductor is made thinner, electrons get smaller area of cross-section to flow and it therefore, offers a large resistance.

Solution 23

At constant temperature, if current is plotted against potential difference, the plot will be a straight line making some slope with the x-axis as shown in figure below:

Solution 24

The instrument used to measure electric current is called an ammeter. It has a low resistance and is always connected in series.

Solution 25

The instrument used to measure electric potential or potential difference is called a voltmeter. It has a very high resistance and is always connected in parallel.

Solution 26

An ammeter has a low resistance.

Solution 27

A voltmeter has a high resistance.

Solution 28

A key acts as a switch in an electric circuit. It helps to open or close the circuit as required.

Solution 29

A rheostat is a device used in electric circuit to regulate current without changing the voltage source. It is also called variable resistance.

Solution 30

Solution 31

Solution 32

Solution 33

Solution 34

Solution 35

Solution 36

Solution 37

Solution 38

Solution 39

Solution 40

Two uses of conductors:
(i) Connecting wires are made of conductors like copper.
(ii) Conductors are used as electrolytes in cells

## Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Ohm's Law and Electric Circuits Page/Excercise 189

Solution 41

(a) Ampere
(b) Volt
(c) Coulomb

Solution 42

The potential difference between two points may be defined as the work done in moving a unit positive charge from one point to the other.

Solution 43

Electrical potential is a 'scalar' quantity.

Solution 44

Electric intensity is defined as the force experienced by a unit positive charge when kept at that point.
Its SI unit is newton per coulomb. It is a vector quantity.

Solution 45

Joule/coulomb is known as 'volt'.

Solution 46

Work done = charge x potential difference
Or, W = 5 x 1 = 5 J

Solution 47

(ii) potential difference

Solution 48

(iv) voltmeter

Solution 49

Charges move in a definite direction in a conductor when a potential difference is applied across the ends of the conductor.

Solution 50

We can maintain a potential difference between the ends of a conductor by connecting the two ends of the conductor to the two terminals of a battery or cell.

Solution 51

The rate of movement of charge from one point to another through a section of the conductor is called electric current. Current refers to rate of flow of charges in a conductor.
I = Q/t

Solution 52

The direction of conventional current is taken as the direction of flow of positive charges.
The direction of electronic current is taken as opposite to the direction of motion of electrons.

Solution 53

Current defines the rate of flow of charges in a conductor.

Solution 54

Current is measured by an ammeter.

Solution 55

Solution 56

Solution 57

Solution 58

To get a total resistance less than 2 ohm, the given resistors should be connected in parallel because in parallel combination the equivalent resistance is less than the resistance smallest connected resistor.

Solution 59

Solution 60

## Browse Study Material

TopperLearning provides step-by-step solutions for each question in each chapter in the Frank textbook recommended by ICSE schools. Access Chapter Unit - 4 - Current Electricity - Ohm's Law and Electric Circuits here. Our Frank Textbook Solutions for ICSE Class 10 Physics are designed by our subject matter experts. These solutions will help you to revise the whole chapter, so you can clear your fundamentals before the examination.

# Text Book Solutions

ICSE X - Physics

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