Class 10 Physics Chapter 8
Electricity
Important Questions

Electricity is a secondary energy source, which means it is converted from another primary source, such as coal, natural gas, oil, nuclear, or renewable sources. It's the flow of electrical power or charge and is both a basic part of nature and one of the most widely used forms of energy. Comprehending the concepts of electricity is crucial not just for achieving scholastic success but also for understanding the laws governing the real-world occurrences we encounter. Here you will find class 10 Electricity important questions and answers.

Introduction

Electricity, at its core, is the movement of electrons through a conductive path, such as a wire. This flow, often referred to as an electrical current, has become a cornerstone of modern society, powering vast technological advances, homes, industries, and more. Static electricity is the buildup of electric charge on a surface, like the spark produced when rubbing shoes on a carpet. In contrast, current electricity is a steady flow of electrons through a conductor. If you want to prepare well then below are some ICSE physics class 10 current electricity questions and answers.

What are Electricity?

Electricity is a form of energy resulting from the existence of charged particles, such as electrons or protons, either statically as an accumulation of charge or dynamically as a current. In simpler terms, electricity is the flow of electrical power or charge. It's a secondary energy source, which means that it is converted from another source of energy, like coal, natural gas, oil, nuclear power, or renewable sources.

Class 10 Electricity Important Questions and Answers

Q1. Which of the following trend in V-I graph will never be obtained when two resistors of resistance 2 Ω and 6 Ω are connected in parallel? 

Options

(a) Trend A
(b) Trend C
(c) Trend B
(d) Both Trend A and B

Ans. (b) Trend C

Explanation:
When two resistors are connected in parallel, their combined (equivalent) resistance is given by the reciprocal of the sum of their reciprocals. This means the total or equivalent resistance of two parallel resistors will always be less than the smallest of the two resistances.

Q2. A conducting wire of length 2 meter and cross sectional area of 4 m² has resistance of 4 Ω. What is the resistivity of the wire?

Options

(a) 4 Ω-m
(b) 6 Ω-m
(c) 8 Ω-m
(d) 10 Ω-m

Ans. (c) 8 Ω-m
Explanation:
We know that resistivity, ρ = RA/l. where R is the resistance, A is the cross sectional area of the wire and l is the length of the wire.
Given: R = 4 Ω; A = 4 m2; l = 2 m.
Thus, ρ = (4 × 4)/2 = 8 Ω-m

Q3.  State two facts about parallel combination of resistors?

Explanation:
Two facts about parallel combination of resistors are as follows:
(i) Potential difference across each resistor is same, which is equal to the potential difference across the terminals  of the battery.
(ii) The main current (I) divides itself in the different arms having the resistors such that: 
      I = I1 + I2 + I3.

Q4. Three bulbs, A, B, and C are connected in parallels  with a battery of 16 V and a switch, as shown in the figure below. Resistance of bulb A is twice of B but half of C. Answer the following questions?

Which bulb will have more power if make an arrangement such that all bulbs have same resistance?

Explanation:
Bulb C
As bulbs are in parallel connection, the only thing that will determine accessible current is resistances of the bulb. As bulb C has the highest resistance, it will carry less current.

Q5. Define the unit ohm.

Explanation:
One ohm is the resistance of a conductor in which 1 ampere current flows when the potential difference across its ends is 1 volt.The ohm (symbol : Ω) is the SI (International System of Units) derived unit of electrical resistance. It is named after the German physicist Georg Simon Ohm, who first formulated Ohm's Law, which relates the voltage (V), current (I), and resistance (R) in an electrical circuit:
V=IR

ICSE Class 10 Physics Chapter wise Important Questions

Conclusion

The significance of electricity remains undiminished, and its judicious use and understanding become even more crucial. It's not just a subject of scientific inquiry but a testament to human ingenuity and adaptability. If you seek additional practice and a deeper comprehension of the topics covered in the chapter, oswal.io offers an extensive array of ICSE physics class 10 current electricity questions and answers to facilitate a more profound understanding of the concepts.

Frequently Asked Questions

Q1 : What is electricity?

Ans:  Electricity is the flow of electrical power or charge. It is both a basic part of nature and one of the most widely used forms of energy.

Q2 : How is electricity generated?

Ans: Electricity is typically generated by converting mechanical energy to electrical energy, using methods like burning fossil fuels, nuclear reactions, or harnessing renewable sources like wind, water, and solar energy.

Q3 : What's the difference between AC and DC?

Ans: AC (Alternating Current) is an electric current that reverses direction periodically, while DC (Direct Current) flows consistently in one direction.

Q4 : What are conductors and insulators?

Ans:  Conductors are materials that allow the flow of electricity, such as metals. Insulators resist electric flow, with examples including rubber, glass, and wood.

Q5 : What is the principle behind electric motors?

Ans: Electric motors work on the principle of electromagnetic induction, where a current-carrying conductor experiences a force when placed in a magnetic field, causing motion.