3. Current Electricity
рдЗрд╕ рдкреЗрдЬ рдкрд░ рдЖрдкрдХреЛ 3. Current Electricity рдХреЗ рд╕рднреА рдорд╣рддреНрд╡рдкреВрд░реНрдг рдмрд╣реБрд╡рд┐рдХрд▓реНрдкреАрдп рдкреНрд░рд╢реНрди (MCQ), рдкрд░реАрдХреНрд╖рд╛ рдЙрдкрдпреЛрдЧреА рдиреЛрдЯреНрд╕ рдФрд░ рдСрдирд▓рд╛рдЗрди рдХреНрд╡рд┐рдЬрд╝ рдорд┐рд▓реЗрдВрдЧреЗред рдЕрдкрдиреЗ рдЬреНрдЮрд╛рди рдХрд╛ рдкрд░реАрдХреНрд╖рдг рдХрд░рдиреЗ рдФрд░ рдмреЛрд░реНрдб/рдкреНрд░рддрд┐рдпреЛрдЧреА рдкрд░реАрдХреНрд╖рд╛ рдореЗрдВ рд╢рдд-рдкреНрд░рддрд┐рд╢рдд рдЕрдВрдХ рдкреНрд░рд╛рдкреНрдд рдХрд░рдиреЗ рдХреЗ рд▓рд┐рдП рдиреАрдЪреЗ рджрд┐рдП рдЧрдП рдореЙрдХ рдЯреЗрд╕реНрдЯ рдореЗрдВ рдЕрд╡рд╢реНрдп рднрд╛рдЧ рд▓реЗрдВред
ЁЯСЙ рдЕрдзреНрдпрд╛рдп рдХрд╛ рд╕рд╛рд░рд╛рдВрд╢ (Summary)
Dear students, in this chapter, we will study 1 extremely important, practical, and highly fascinating branch of physics that literally powers our entire modern world: 'Current Electricity'. In the previous 2 chapters, we deeply studied electrostatics, where the electric charges were completely at rest. However, what exactly happens when these electric charges start moving continuously in 1 specific direction? This continuous flow of electric charge is scientifically known as electric current. From the small glowing bulb in your study room to the massive electric trains running across the country, everything is 100 percent dependent on this fundamental principle of moving charges.
Instead of just cramming complex mathematical derivations in closed books, if we logically connect physics with our real life and daily surroundings, it feels extremely magical. Have you ever thought deeply about how exactly your smartphone gets charged when you plug 1 small wire into the wall socket? Or why the metallic wire of 1 room heater becomes red hot while the connecting copper wires remain completely cool? This is no magic trick, but it is 100 percent the scientific marvel of electric current, electrical resistance, and the heating effect of current. When millions of free electrons flow through 1 metallic conductor like copper, they continuously collide with the positive ions of the metal, creating 1 natural opposition to their flow, which we call resistance. Georg Simon Ohm mathematically formulated this exact relationship, beautifully known to the world as Ohm's Law.
From the strict perspective of the upcoming NCERT and RBSE board exams, this specific chapter of physics is highly scoring and extremely important for your 100 percent success. In the board exams, not only direct theoretical questions are asked from this chapter, but excellent analytical, numerical, and circuit-based questions on Kirchhoff's Laws, Wheatstone Bridge, and the combination of resistors definitely appear in the final exam paper every single year without fail. In this highly exciting journey, we will 1st study the exact mathematical formula of drift velocity very closely. We will scientifically learn how electrons actually drift slowly in 1 conductor when an external electric field is applied using 1 battery.
Moving 1 little further in the chapter, we will logically analyze the temperature dependence of resistance. We will deeply understand why the resistance of 1 metal increases with temperature while the resistance of 1 semiconductor rapidly decreases. After this, we will study the highly powerful Kirchhoff's 2 rules: the junction rule and the loop rule. These 2 mathematical rules are 100 percent essential to solve complex electrical circuits where simple series and parallel formulas completely fail. We will logically calculate the exact balanced condition of 1 Wheatstone Bridge and clearly see how it is practically used in devices like the meter bridge to measure unknown resistances accurately. We will also understand the internal resistance of 1 cell and the exact parallel and series grouping of cells.
To perfectly ensure your excellent and 100 percent strong preparation, we have meticulously selected and prepared completely accurate, high-level, and highly exam-useful objective questions (MCQs) from all these complex topics. By continuously practicing again and again, you will surely learn critical time management and massively increase your exact speed of solving complex numerical questions without making even 1 single mistake.
Feature: This is 1 3-Level based unique quiz. To unlock the next level (Level 2 and 3), students must score at least 70% in the current level, making their board exam preparation 100% strong.
рдорд╣рддреНрд╡рдкреВрд░реНрдг рдкреНрд░рд╢реНрди (Important Questions)
PDF рдбрд╛рдЙрдирд▓реЛрдб рдХрд░реЗрдВрдЕрдзреНрдпрд╛рдп рдХреЗ рд╕рднреА рдкреНрд░рд╢реНрди (Revision Notes)
*рдиреЛрдЯ: рдпрд╣ рд╕реЗрдХреНрд╢рди рд░рд┐рд╡реАрдЬрди рдХреЗ рд▓рд┐рдП рд╣реИред рдЕрдкрдирд╛ рдЬреНрдЮрд╛рди рдкрд░рдЦрдиреЗ рдХреЗ рд▓рд┐рдП рдКрдкрд░ рджрд┐рдП рдЧрдП рдХреНрд╡рд┐рдЬрд╝ рдореЗрдВ рднрд╛рдЧ рд▓реЗрдВред
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SI unit of electric current is?
A) Volt | B) Ohm | C) Ampere | D) Watt -
Formula for Ohm's law is?
A) V = IR | B) P = VI | C) F = ma | D) Q = CV -
Unit of resistance is?
A) Ampere | B) Ohm | C) Volt | D) Coulomb -
Unit of electric power is?
A) Joule | B) Watt | C) Ampere | D) Volt -
Unit of resistivity is?
A) Ohm | B) Ohm-meter | C) Ohm/meter | D) Ampere-meter -
Electric current is a ......... quantity?
A) Vector | B) Scalar | C) Both | D) None -
Order of drift velocity is?
A) 10^8 m/s | B) 10^-4 m/s | C) 10^3 m/s | D) 0 -
Unit of electromotive force (emf) is?
A) Newton | B) Joule | C) Volt | D) Ampere -
On increasing temp of conductor, resistance?
A) Decreases | B) Increases | C) Remains constant | D) Zero -
Kirchhoff's first law is based on?
A) Energy | B) Momentum | C) Charge | D) Mass -
Kirchhoff's second law is based on?
A) Charge | B) Energy | C) Momentum | D) Mass -
Wheatstone bridge measures?
A) Unknown resistance | B) Current | C) Potential | D) Charge -
Conductivity is the ......... of resistivity?
A) Same | B) Reciprocal | C) Double | D) Zero -
Resistance of an ideal ammeter is?
A) Infinity | B) High | C) Zero | D) 100 Ohm -
Resistance of an ideal voltmeter is?
A) Zero | B) Infinity | C) 1 Ohm | D) 100 Ohm -
V-I graph for an ohmic conductor is?
A) Parabola | B) Straight line | C) Circle | D) None -
On increasing temp of semi-conductors, resistivity?
A) Increases | B) Decreases | C) Constant | D) Zero -
Resistivity depends on?
A) Length | B) Area | C) Nature and temp | D) Shape -
Drift velocity (vd) is proportional to?
A) E | B) E^2 | C) 1/E | D) Independent -
Total internal resistance in series combination?
A) Increases | B) Decreases | C) Constant | D) Zero -
Internal resistance depends on?
A) Distance | B) Concentration | C) Immersed area | D) All -
Current in bridge at equilibrium is?
A) Maximum | B) Minimum | C) Zero | D) Stable -
In parallel combination, what remains same?
A) Current | B) Potential difference | C) Resistance | D) Power -
In series combination, what remains same?
A) Potential difference | B) Current | C) Power | D) None -
Unit of mobility is?
A) m^2/Vs | B) Vm/s | C) m/s | D) Vs/m -
On doubling the length, resistance becomes?
A) 2 times | B) 4 times | C) Half | D) Same -
Resistance of a superconductor is?
A) High | B) Infinity | C) Zero | D) Constant -
Formula for electrical energy (H) is?
A) I^2Rt | B) V^2t/R | C) VIt | D) All -
Value of 'Red' color in color code is?
A) 1 | B) 2 | C) 3 | D) 0 -
Temperature coefficient for metals is?
A) Positive | B) Negative | C) Zero | D) Infinity -
New resistance of 10 Ohm wire on doubling its length?
A) 10 | B) 20 | C) 40 | D) 5 -
Equivalent resistance of 2 and 3 Ohm in series?
A) 5 | B) 6 | C) 1.2 | D) 1 -
Equivalent resistance of two 6 Ohm resistors in parallel?
A) 12 | B) 3 | C) 36 | D) 1 -
Current at 2V emf, 0.1 internal and 1.9 external resistance?
A) 1A | B) 2A | C) 0.5A | D) 10A -
Between 40W and 60W in series, which shines brighter?
A) 40W | B) 60W | C) Both | D) None -
Algebraic sum of currents at a junction is?
A) Infinity | B) Zero | C) Constant | D) Positive -
Charge if 2A current flows for 10 seconds?
A) 5C | B) 20C | C) 12C | D) 0.2C -
Energy (Units) consumed by 100W bulb in 10 hours?
A) 10 | B) 1 | C) 100 | D) 0.1 -
If P=10, Q=10, R=10, then S for equilibrium is?
A) 10 | B) 20 | C) 5 | D) 100 -
Resistivity of copper compared to iron is?
A) Less | B) More | C) Equal | D) Zero -
Resistance at 10V potential and 2A current is?
A) 20 | B) 5 | C) 12 | D) 0.2 -
Effect of temp on resistivity of Manganin?
A) High | B) Negligible | C) Decreases | D) Zero -
Current if 6.25x10^18 electrons flow per second?
A) 1A | B) 1.6A | C) 10A | D) 0.1A -
Unit of Kilowatt-hour (kWh) is?
A) Power | B) Energy | C) Current | D) Potential -
Cell is a source of?
A) Electrons | B) Energy | C) Charge | D) None
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