Current electricity Part -1
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10th standard science chapter Tamil Nadu state board syllabus - chapter 12. This is just a part 1 of current electricity chapter. The next parts are available here, just check it out and learn Electricity.
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* I2 = 4 A (given)
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* So: 2.5 A = 4 A + I3
* Solving for I3: I3 = 2.5 A - 4 A = -1.5 A
The value of I3 is -1.5 A. The answer is 3.
Current Electricity and Effects of Current
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3) The key concepts of charge, current, voltage, power, and energy are defined using standard SI units, and their relationships are expressed through mathematical equations.
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Lecture 6 1_electricity
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Current electricity Part -1
- 1. Electricity PHYSICS | 10TH STANDARD | CHAPTER 12
- 2. Objectives The things that we are going to discuss are, •What is Electric current? •What is potential and potential difference? •How to calculate the value of current? •Ohms law
- 3. Law of conservation of Energy •Energy can neither be created nor be destroyed, but it can transfer from one form to another form of energy. •For example, In Batteries, chemical energy ~ Electrical energy. •In fan, Electrical energy ~ Mechanical energy.
- 5. • Dictionary meaning of current – ‘Flow’ • Electric current – Flow of electric charges from one point to another point through a conductor, like a metallic wire. • The rate of flow of charges – Electric current. Current 𝑰 = 𝑸/𝒕 Q – Charge | t –Time Charge
- 6. Units and symbols •The unit of charge (Q) – coulomb (C) •The unit of time (t) – second (s) •The unit of current (I=Q/t) – coulomb per second (C/s) or Ampere (A) •1 coulomb of charge = 6.25*1018 electrons.
- 8. Potential difference •A charge cannot move by itself. It needs a driving force. •A charge will always flow from higher potential to lower potential.
- 9. Here, the potential difference is created by the battery, between the two electrodes – higher potential (-) and lower potential (+).
- 10. •The chemical action within the cell generates a potential difference across the terminals of the cells. •When a wire is connected between these terminals the charges are set in motion, which produces current. •Potential difference, 𝑉 = 𝑊 𝑄 (𝑣𝑜𝑙𝑡) •W-work done •Q-charge
- 11. symbols of some commonly used components in circuit diagrams.
- 12. Problems Q1, A current of 0.5 A is drawn by a filament of an electrical bulb for 10 minutes. Find the amount of electrical charge that flows through the circuit?
- 13. Ans: We are given, I=0.5 A; t=10min=600s. From equation, I=Q/t,We have Q=It =0.5A * 600s =300c
- 14. Q2, How much work is done in moving a charge of 2C across two points having a potential difference 12V?
- 15. Ans: The amount of charge Q that flows between two points at potential difference v(=12v) is 2C. Thus, the amount of work W, done in moving the charge (from equation V=W/Q) is W=VQ =12v * 2C =24J.
- 16. Q3,Your friend says that a battery supplies the electrons in an electrical circuit. Do you agree or disagree? Defend your answer.
- 17. Q4, Is a current carrying wire electrically charged?
- 18. Q5, In which of the circuit below does a current exist to light the bulb?