Electric Charge And Electric Current — Flashcards
Tamil Nadu Board · Class 9 · Science
27 flashcards for Electric Charge And Electric Current (Tamil Nadu Board Class 9 Science) to test yourself on key terms and facts.
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What is electric charge and what is its fundamental unit?
Answer
Electric charge is a fundamental property of all matter, just like mass and length. Every atom contains electrons (negatively charged) and protons (positively charged). The fundamental unit of electri…
How many electrons are present in one coulomb of charge?
Answer
Using the relationship q = ne, where q = 1 C and e = 1.6 × 10⁻¹⁹ C: n = q/e = 1 / (1.6 × 10⁻¹⁹) = 6.25 × 10¹⁸ electrons This means one coulomb contains approximately 6.25 × 10¹⁸ electrons. This large…
What happens when you rub a plastic comb on dry hair?
Answer
When you rub a plastic comb on dry hair, electrons transfer from your hair to the comb. The comb becomes negatively charged (gains electrons) and develops the power to attract small pieces of paper. Y…
Distinguish between like charges and unlike charges in terms of forces.
Answer
Like Charges: Charges with the same sign (both positive or both negative) repel each other. For example, two positively charged balloons push away from each other. Unlike Charges: Charges with opposi…
What is an electric field and how is it represented?
Answer
An electric field is the region around a charged object where another charged object experiences an electric force. Electric fields are represented by lines called 'electric lines of force' with arrow…
Calculate the charge measurement: What are micro coulomb (μC), nano coulomb (nC), and pico coulomb (pC)?
Answer
Practical charge measurement units (since 1 coulomb is very large): Micro coulomb: 1 μC = 10⁻⁶ C = 0.000001 C Nano coulomb: 1 nC = 10⁻⁹ C = 0.000000001 C Pico coulomb: 1 pC = 10⁻¹² C = 0.000000000001…
What is electric current and how is it defined mathematically?
Answer
Electric current is the rate at which electric charge flows through a conductor. It represents the amount of charge passing through a cross-section of a wire per unit time. Mathematical definition: I…
Problem: If 25 C of charge passes through a wire in 50 seconds, calculate the electric current.
Answer
Given: q = 25 C, t = 50 s Formula: I = q/t Calculation: I = 25 C / 50 s I = 0.5 C/s I = 0.5 A (ampere) Answer: The electric current is 0.5 ampere. This means 0.5 coulombs of charge flows through th…
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