NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects

# NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects

Edited By Vishal kumar | Updated on Feb 16, 2024 06:21 PM IST

NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects: Solutions for science chapter 14 class 7 are part of NCERT Solutions for Class 7 Science. If you are a Class 7 student who is following the NCERT book, then a tool like NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects is helpful in the preparation of the chapter. Electric current and effect deal with the concepts of representation of electrical components such as bulbs, switches, batteries etc. using symbols, the heating effect and the magnetic of current and also electromagnet and its applications.

The NCERT solutions for Class 7 Science chapter 14 Electric Current and Its Effects help students to be familiar with the concepts studied in the chapter. NCERT Solutions for Class 7 Science chapter 14 Electric Current and Its Effects will give you answers to all the thirteen questions which are mentioned in the exercise. The NCERT solutions are an important tool for a student who is following the NCERT syllabus. Students are recommended to go through NCERT Solutions for Class 7 to score high marks in their examinations.

**As per the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 10 in Class 7 Science.

Free download class 7 electric current and its effects ncert solutions PDF for CBSE exam.

### Download the PDF of NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects

NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects: Exercise Question and Answer

Symbols for various components of electrical circuits are-

 Electric Components Symbols Connecting Wires Switch OFF position Bulb Cell Switch ON position Battery

In the above figure, one end of the cell is connected to bulb and the other is connected to switch. The switch is in OFF position. One end of the bulb is connected to switch and the other is with the cell.
The circuit diagram of the above-given figure is-

To make a battery from the four cell we need to connect the one positive end of a cell to the negative end of the other cell. In this way, we can form a four-cell battery.

The problem in the above circuit diagram is that cells are not connected properly, both the positive terminal of a cell is connected. To glow bulb, the positive end of the cell must be connected with the negative end of the other cell. As shown in the figure:-

The two effects of electric current are-
(i) Heating effect- When current is passing through the wires, the wires become hot and produces heat.

(ii) Magnetic Effect - When current is passing through the wires, it behaves like a magnet.

When the current is passing through the wires, it behaves like a magnet and rises to a magnetic field around it which exerts a magnetic force on the compass needle and reflects it from North-South position.

No, Because in the above circuit diagram there is no source of current supply like battery or cell. In the absence of current wire will not act as a magnet, and hence needle will not show any deflection.

(a) Longer line in the symbol for a cell represents its_____________ terminal.
(b) The combination of two or more cells is called a_________ .
(c) When current is switched ‘on’ in a room heater, it ____________ .
(d) The safety device based on the heating effect of electric current is called a_____________ .

(a) Positive
(b) Battery
(c) Produces heat (due to the heating effect of current)
(d) Fuse (When a large amount of current is flowing through the wire, it melts and break the circuit)

(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)
(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)
(c) An electromagnet does not attract a piece of iron. (T/F)
(d) An electric bell has an electromagnet. (T/F)

(a) False, Negative terminal should be connected to the positive terminal of the other cell

(b) True, The wire of fuse is of low melting point. So, when the heat due to current is higher than a certain limit, it melts quickly and breaks the circuit

(c) False, A magnet always attracts the iron piece.

(d) True,

No, because the plastic bag is non-magnetic in nature and hence it is not attracted by the electromagnets from the garbage heap.

No, I m not agree with the electrician because the fuse wire should have a low melting point. So, that it can quickly melt and break the circuit.

The ordinary wire has a high melting point as compare to fuse wire. Thus it cannot be used in fuse wires.

The following defects may be presents in the circuits-

• The rubber band used in the cell holder may not be tight enough to keep the cells in proper contact.
• The two cells may not be properly connected. We must connect the negative terminal to the positive end of the other cell.
• The bulb may be fused.
• Circuit connection may be loose. etc

(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

(i) No, because the circuit connection does not compete for any bulb so, that flow of current is not possible.

(ii) Bulbs will glow simultaneously

All the bulbs will glow at once.

class 7 science chapter 14 question answer section consists of a total of thirteen questions. The experts at Careers360 have created solutions for the chapter in easy language and a step-by-step approach, adhering to the latest CBSE syllabus (2023-2024). Additionally, students can access the PDF version of the solution and use it anytime for reference.

Chapter-wise NCERT solutions of class 7 science

Apart from class 7 science ch 14 question answer, students can access complete chapterwise solutions for class 7 science by clicking on the given chapterwise link.

 Chapter 1 Nutrition in Plants Chapter 2 Nutrition in Animals Chapter 3 Fibre to Fabric Chapter 4 Heat Chapter 5 Acids, Bases and Salts Chapter 6 Physical and Chemical Changes Chapter 7 Weather, Climate and Adaptations of Animals to Climate Chapter 8 Winds, storms and cyclones Chapter 9 Soil Chapter 10 Respiration in Organisms Chapter 11 Transportation in Animals and Plants Chapter 12 Reproduction in Plants Chapter 13 Motion and Time Chapter 14 Electric Current and its Effects Chapter 15 Light Chapter 16 Water: A Precious Resource Chapter 17 Forests: Our Lifeline Chapter 18 Wastewater Story

## Electric Current and Its Effects Class 7 NCERT Solutions: Important Formulas and Points

#### Basic of charge

• Electric charge is a fundamental property of matter that leads to the interaction of objects when placed in an electromagnetic field.

• There are two types of electric charges: positive and negative. Objects with the same type of charge (either both positive or both negative) repel each other, while objects with different types of charge (one positive and one negative) attract each other.

• The standard unit of electric charge is the Coulomb (C). One Coulomb is equivalent to approximately 6.242×1018 elementary charges (e).

• The charge of an electron, a fundamental subatomic particle, is approximately -1.602×10-19 Coulombs (C). This charge is considered negative.

#### Heating Effects of Electric Current

• The heating effect of electric current refers to the generation of heat in a wire when electricity passes through it.

• The amount of heat produced depends on factors like the material, thickness, and length of the conductor. Overheating can lead to wire damage or melting, and this effect is used in appliances like heaters, toasters, and safety devices such as fuses.

#### Electric Bulb and Electric Fuse

Electric Bulbs: Electric bulbs produce light when the filament inside them becomes extremely hot due to the passage of electric current, a phenomenon known as incandescence.

Electric Fuse: An electrical fuse consists of a wire that melts when subjected to excessive current, serving as a safety device to break the circuit and prevent overloading. Fuses are essential for preventing fires and protecting electrical circuits and appliances.

#### Electric bell

• An electric bell primarily consists of an electromagnet.

• To activate the bell, a switch is pressed, completing the electrical circuit.

• Completing the circuit allows electric current to flow through the coil of the electromagnet.

• The energized electromagnet attracts a movable armature.

• As the armature is attracted, it strikes a bell or a gong, producing a ringing sound.

• Releasing the switch interrupts the circuit, de-energizing the electromagnet and allowing the armature to return to its original position.

## Electric Current and its Effects Class 7 Science Chapter 14-Topics

Topics for electric current and its effects class 7 questions and answers are listed below:

• Symbols of Electric Components
• Heating Effect of Electric Current
• Magnetic Effect of Electric Current
• Electromagnet
• Electric Bell

• ## If you have the detailed NCERT solutions for Class 7 Science Chapter 14 Electric Current and Its Effects in your hands, you can use them to prepare for exams

• NCERT Solutions for Class 7 Science chapter 14 Electric Current and Its Effects helps in understanding the concepts well.
• You may expect exactly the same questions discussed in the NCERT solutions for Class 7 Science Chapter 14 Electric Current and Its effects for the annual exam.

## Key Features of Class 7 Science Chapter 14 Question Answer

Conceptual Understanding: The chapter's electric current and its effects class 7 solutions are designed to assess students' understanding of fundamental concepts related to electric current, conductors, insulators, circuits, and the heating effect of electric current.

Problem-Solving: Many questions in this electric current and its effects class 7 ncert solutions require students to apply the principles of electric circuits and conductors to solve problems related to current, resistance, and voltage.

Critical Thinking: Some questions of class 7 science chapter 14 question answer encourage critical thinking by asking students to explain phenomena related to electric current and its effects.

Real-World Applications: class 7 science chapter 14 ncert solutions often relate to practical applications of electricity and how it is used in everyday devices like bulbs, fuses, and heaters.

Safety Considerations: Students may be asked about safety measures related to electrical circuits and devices to ensure they understand the potential hazards and how to prevent them.

Free Access: Electric current and its effects class 7 questions and answers are available for free of charge.

NCERT Solutions for Class 7 Subject Wise

#### Also Check NCERT Books and NCERT Syllabus here

1. Whether the Class 7 Science chapter 14 electric current and its effects is useful in higher studies ?

Yes, this chapter is very important for higher studies in the field of science and electrical engineering. Electricity is studied in Class 10 and 12 NCERT syllabus.

2. What are the topics covered in NCERT Class 7 Science chapter 14?

Here are the topics covered in NCERT Class 7 Science chapter 14

• Symbols of Electric Components
• Heating Effect of Electric Current
• Magnetic Effect of Electric Current
• Electromagnet
• Electric Bell
3. How many questions in NCERT Solutions Class 7 Science chapter 14?

There are 13 questions in NCERT Class 7 Science chapter 14

4. Where can I get the NCERT Solutions for Class 7 Science Chapter 14?

You can access accurate NCERT Solutions for Class 7 Science Chapter 14, created by experts in an easy-to-understand language and step-by-step approach, on the website of Careers360. These solutions are available online and offline and can be accessed for free.

5. What is Electric Current?

Electric current is the flow of electric charge through a conductor. It is a measure of the rate at which electric charges pass through a given point in a circuit. Electric current is measured in amperes (A), and it is denoted by the symbol "I".

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Get answers from students and experts

A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

 Option 1) Option 2) Option 3) Option 4)

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

 Option 1) 2.45×10−3 kg Option 2)  6.45×10−3 kg Option 3)  9.89×10−3 kg Option 4) 12.89×10−3 kg

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

 Option 1) Option 2) Option 3) Option 4)

A particle is projected at 600   to the horizontal with a kinetic energy . The kinetic energy at the highest point

 Option 1) Option 2) Option 3) Option 4)

In the reaction,

 Option 1)   at STP  is produced for every mole   consumed Option 2)   is consumed for ever      produced Option 3) is produced regardless of temperature and pressure for every mole Al that reacts Option 4) at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, will contain 0.25 mole of oxygen atoms?

 Option 1) 0.02 Option 2) 3.125 × 10-2 Option 3) 1.25 × 10-2 Option 4) 2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

 Option 1) decrease twice Option 2) increase two fold Option 3) remain unchanged Option 4) be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

 Option 1) Molality Option 2) Weight fraction of solute Option 3) Fraction of solute present in water Option 4) Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

 Option 1) twice that in 60 g carbon Option 2) 6.023 × 1022 Option 3) half that in 8 g He Option 4) 558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

 Option 1) less than 3 Option 2) more than 3 but less than 6 Option 3) more than 6 but less than 9 Option 4) more than 9