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NCERT Class 10 Science Electricity: In-text questions (page 172) Solutions
AI-written, checked on 23 Oct 2026
Solutions written by Shishya, checked — not the board's official answers
Step-by-step working for every question of In-text questions (page 172) in NCERT's Class 10 Science book, chapter “Electricity”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.
How these were checked: the solutions were drafted with AI and then read and corrected on 23 Oct 2026. Every numerical final answer is recomputed from the question's own numbers by a calculator check that runs before each release; proofs and explanations were read, not machine-checked. The NCERT textbook is the authority — if something here disagrees with it, follow the book.
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In-text (page 172) Q1
What does an electric circuit mean?
- An electric circuit is a closed path through which electric current flows.
- It consists of a source of energy, such as a battery or cell.
- It includes conducting wires that connect the components.
- It contains electrical devices like bulbs or resistors.
- It also has a control device like a switch to open or close the path.
Answer: An electric circuit is a closed path consisting of a source, conducting wires, electrical devices, and a switch through which current flows.
In-text (page 172) Q2
Define the unit of current.
- The unit of electric current is the ampere, abbreviated as A.
- One ampere is defined as the flow of one coulomb of electric charge through a point in a circuit in one second.
- Mathematically, this relationship is expressed as 1 A = 1 C/s.
Answer: The unit of current is the ampere (A), defined as the flow of one coulomb of charge per second.
In-text (page 172) Q3
Calculate the number of electrons that make up one coulomb of charge.
- The charge of a single electron is approximately 1.6 × 10⁻¹⁹ C.
- The total charge given is 1 C.
- The number of electrons is calculated by dividing the total charge by the charge of one electron.
- Number of electrons = 1 ÷ (1.6 × 10⁻¹⁹).
- Number of electrons = 6.25 × 10¹⁸.
Answer: 6.25 × 10¹⁸
Other exercises in this chapter
- In-text questions (page 174) — 3 questions
- In-text questions (page 181) — 5 questions
- In-text questions (page 185) — 2 questions
- In-text questions (page 188) — 5 questions
- In-text questions (page 190) — 3 questions
- In-text questions (page 192) — 2 questions
- End-of-chapter exercises — 18 questions
← Electricity: notes, practice and all exercises
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