What does Current Electricity cover for NEET Physics?

12 lessons: Drift Velocity Mobility, Electric Current, Electrical Energy Power, Electrical Resistance, Internal Resistance EMF, Kirchhoff's Laws, Metre Bridge, Ohm's Law, Resistivity Conductivity, Resistors Series Parallel, Temperature Dependence Resistance and Wheatstone Bridge.

How often has Current Electricity come up in NEET past papers?

Our set of verified past papers has 18 questions from this unit, from NEET 2020, 2021, 2022, 2023, 2024 and 2026. Each is answered against the official NTA key.

Is the Current Electricity material free?

Yes. All 12 lessons and 96 practice questions are free, with no login needed.

Current Electricity

12 lessons

Topic index in NCERT order

12 of 12 lessons by the NCERT chapter they teach from, in book order. The page is the first printed page of your NCERT book the lesson cites; PYQs are the past NEET questions on that topic.

Class 12 Physics, Chapter 3

Electric Currentp. 820 PYQs
Electrical Resistancep. 830 PYQs
Ohm's Lawp. 830 PYQs
Resistivity Conductivityp. 841 PYQ
Drift Velocity Mobilityp. 862 PYQs
Temperature Dependence Resistancep. 905 PYQs
Electrical Energy Powerp. 932 PYQs
Internal Resistance EMFp. 942 PYQs
Kirchhoff's Lawsp. 1000 PYQs
Metre Bridgep. 1011 PYQ
Wheatstone Bridgep. 1011 PYQ

Class 12 Physics (pre-2023 edition), Chapter 3

Resistors Series Parallelp. 1074 PYQs

Drift Velocity Mobility

8 MCQs2 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Electric Current

8 MCQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Electrical Energy Power

8 MCQs2 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Electrical Resistance

8 MCQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Internal Resistance EMF

8 MCQs2 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Kirchhoff's Laws

8 MCQsWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Metre Bridge

8 MCQs1 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Ohm's Law

8 MCQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Resistivity Conductivity

8 MCQs1 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Resistors Series Parallel

8 MCQs4 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Temperature Dependence Resistance

8 MCQs5 PYQsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Wheatstone Bridge

8 MCQs1 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Past-paper questions from this unit

18 questions from NEET 2020, 2021, 2022, 2023, 2024, 2026. Answers verified against NTA official keys.

By year in our set: 2020 (4) · 2021 (3) · 2022 (4) · 2023 (3) · 2024 (3) · 2026 (1)

Lesson: Temperature Dependence Resistance

NEET 2026

Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, +α, while the other one has a negative temperature of coefficient, −α, as shown in the figure. The current through these circuits are denoted by I_A and I_B. At initial temperature, the resistance of the two resistors is R₀. As the temperature is increased, the correct option that describes the variation of current in these circuits is :

1I_A remains constant while I_B increases

2I_A decreases while I_B increases

3I_A increases while I_B decreases

4both I_A and I_B remain constant

NTA Answer: Option 1(final)

Report an error · Every fix is public: corrections log

Lesson: Internal Resistance EMF

NEET 2024Revised key

The terminal voltage of the battery, whose emf is 10 V and internal resistance 1 Ω, when connected through an external resistance of 4 Ω as shown in the figure is:

14 V

26 V

38 V

410 V

NTA Answer: Option 3(revised_final)

Report an error · Every fix is public: corrections log

Lesson: Resistors Series Parallel

NEET 2024Revised key

A wire of length ‘l’ and resistance 100 Ω is divided into 10 equal parts. The first 5 parts are connected in series while the next 5 parts are connected in parallel. The two combinations are again connected in series. The resistance of this final combination is:

126 Ω

252 Ω

355 Ω

460 Ω

NTA Answer: Option 2(revised_final)

Report an error · Every fix is public: corrections log

Lesson: Electrical Energy Power

NEET 2024Revised key

Two heaters A and B have power rating of 1 kW and 2 kW, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:

11 : 1

22 : 9

31 : 2

42 : 3

NTA Answer: Option 2(revised_final)

Report an error · Every fix is public: corrections log

Lesson: Resistors Series Parallel

NEET 2023

Resistance of a carbon resistor determined from colour codes is (22000 ± 5%) Ω. The colour of third band must be

1Green

2Orange

3Yellow

4Red

NTA Answer: Option 2(final)

Report an error · Every fix is public: corrections log

Lesson: Resistors Series Parallel

NEET 2023

10 resistors, each of resistance R are connected in series to a battery of emf E and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased n times. The value of n is

1100

31000

410

NTA Answer: Option 1(final)

Report an error · Every fix is public: corrections log

Lesson: Temperature Dependence Resistance

NEET 2023

The resistance of platinum wire at 0°C is 2 Ω and 6.8 Ω at 80°C. The temperature coefficient of resistance of the wire is

13 × 10⁻³ °C⁻¹

23 × 10⁻² °C⁻¹

33 × 10⁻¹ °C⁻¹

43 × 10⁻⁴ °C⁻¹

NTA Answer: Option 2(final)

Report an error · Every fix is public: corrections log

Lesson: Electrical Energy Power

NEET 2022

Two resistors of resistance, 100 Ω and 200 Ω are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in 100 Ω to that in 200 Ω in a given time is

14 : 1

21 : 2

32 : 1

41 : 4

NTA Answer: Option 3(final)

Report an error · Every fix is public: corrections log

Lesson: Temperature Dependence Resistance

NEET 2022

As the temperature increases, the electrical resistance

1Decreases for conductors but increases for semiconductors

2Increases for both conductors and semiconductors

3Decreases for both conductors and semiconductors

4Increases for conductors but decreases for semiconductors

NTA Answer: Option 4(final)

Report an error · Every fix is public: corrections log

Lesson: Resistivity Conductivity

NEET 2022

A copper wire of length 10 m and radius (10⁻²/√π) m has electrical resistance of 10 Ω. The current density in the wire for an electric field strength of 10 (V/m) is

110⁵ A/m²

210⁴ A/m²

310⁶ A/m²

410⁻⁵ A/m²

NTA Answer: Option 1(final)

Report an error · Every fix is public: corrections log

Lesson: Wheatstone Bridge

NEET 2022

A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P and Q

1Do not play any significant role

2Should be approximately equal to 2X

3Should be approximately equal and are small

4Should be very large and unequal

NTA Answer: Option 3(final)

Report an error · Every fix is public: corrections log

Lesson: Drift Velocity Mobility

NEET 2021

Match Column - I and Column - II and choose the correct match from the given choices. Column - I Column - II 1 nmv2 (A) Root mean square (P) 3 speed of gas molecules 3 RT (B) Pressure exerted (Q) M by ideal gas 5 RT (C) Average kinetic (R) 2 energy of a molecule 3 k T (D) Total internal (S) B 2 energy of 1 mole of a diatomic gas

1(A) - (R), (B) - (Q), (C) - (P), (D) - (S)

2(A) - (R), (B) - (P), (C) - (S), (D) - (Q)

3(A) - (Q), (B) - (R), (C) - (S), (D) - (P)

4(A) - (Q), (B) - (P), (C) - (S), (D) - (R)

NTA Answer: Option 4(final)

Report an error · Every fix is public: corrections log

Lesson: Internal Resistance EMF

NEET 2021

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

162 cm

260 cm

321.6 cm

464 cm

NTA Answer: Option 2(final)

Report an error · Every fix is public: corrections log

Lesson: Resistors Series Parallel

NEET 2021

Three resistors having resistances r₁, r₂ and r₃ are connected as shown in the given circuit. The ratio i₃/i₁ of currents in terms of resistances used in the circuit is

1r₂/(r₁ + r₃)

2r₁/(r₂ + r₃)

3r₂/(r₂ + r₃)

4r₁/(r₁ + r₂)

NTA Answer: Option 3(final)

Report an error · Every fix is public: corrections log

Lesson: Metre Bridge

NEET 2020

A resistance wire connected in the left gap of a metre bridge balances a 10 Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1 Ω of the resistance wire is :

11.5×10⁻² m

21.0×10⁻² m

31.0×10⁻¹ m

41.5×10⁻¹ m

NTA Answer: Option 3(final)

Report an error · Every fix is public: corrections log

Lesson: Temperature Dependence Resistance

NEET 2020

The solids which have the negative temperature coefficient of resistance are :

1insulators and semiconductors

2metals

3insulators only

4semiconductors only

NTA Answer: Option 1(final)

Report an error · Every fix is public: corrections log

Lesson: Drift Velocity Mobility

NEET 2020

A charged particle having drift velocity of 7.5 × 10⁻⁴ m s⁻¹ in an electric field of 3 × 10⁻¹⁰ V m⁻¹, has a mobility in m² V⁻¹ s⁻¹ of :

12.25 × 10⁻¹⁵

22.25 × 10¹⁵

32.5 × 10⁶

42.5 × 10⁻⁶

NTA Answer: Option 3(final)

Report an error · Every fix is public: corrections log

Lesson: Temperature Dependence Resistance

NEET 2020

Which of the following graph represents the variation of resistivity (ρ) with temperature (T) for copper ?

NTA Answer: Option 4(final)

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Exam traps and common mistakes in this unit

Lesson: Metre Bridge

Trap

Wheatstone bridge ratio inversion

Category: Similar Terms

Student writes Q/P = R/S or S/R = P/Q instead of P/Q = R/S. Order of arms in the proportion matters.

When it triggers

Wheatstone bridge problem with 4 named arms.

How to avoid

Standard convention: P, Q in one branch (P top, Q bottom from input node); R, S in other branch. Balance: P/Q = R/S.

Lesson: Temperature Dependence Resistance

Mistake

Treats semiconductor temperature coefficient as positive (like a metal).

Root cause: concept gap

Correction

Metals: α > 0 (R increases with T). Semiconductors: α < 0 (R decreases with T) because more thermal carriers. Carbon, silicon, germanium have negative α.

Lesson: Wheatstone Bridge

Mistake

Inverts Wheatstone balance ratio (writes Q/P = R/S or S/R = P/Q).

Root cause: concept gap

Correction

Standard convention P/Q = R/S. P, Q in one branch; R, S in other. Always write four arms in the same rotational order around the bridge.

Formulas in this unit

Lesson: Drift Velocity Mobility

Current from drift velocity

I = n e A v_{d}

Macroscopic current expressed in terms of microscopic drift velocity. n = electron density.

Symbol	Quantity	SI Unit
I	current	A
n	electron density	1/m^3
e	electron charge	C
A	cross-section	m^2
v_d	drift velocity	m/s

Valid when

Steady current
Single-carrier conductor

Lesson: Electrical Energy Power

Electrical power

P = V I = I^{2} R = \frac{V ^{2}}{R}

Power dissipated as heat in resistor (Joule heating).

Symbol	Quantity	SI Unit
P	power	W
V	voltage	V
I	current	A
R	resistance	Ω

Valid when

Resistor (ohmic)
DC or instantaneous

Lesson: Electrical Resistance

Ohm's law

V = I R

Linear ohmic conductor: voltage = current x resistance at constant T.

Symbol	Quantity	SI Unit
V	voltage	V
I	current	A
R	resistance	Ω

Valid when

Ohmic conductor
Constant temperature

Lesson: Internal Resistance EMF

EMF and terminal voltage

V_{t} = ε - I r

Terminal voltage of cell with internal resistance r when current I flows.

Symbol	Quantity	SI Unit
epsilon	EMF	V
r	internal resistance	Ω
I	current	A
V_t	terminal voltage	V

Valid when

Steady current
Cell with constant EMF

Lesson: Metre Bridge

Wheatstone bridge balance

\frac{P}{Q} = \frac{R}{S}

Balance condition: no current through galvanometer when P/Q = R/S. Used to measure unknown resistance.

Symbol	Quantity	SI Unit
P,Q,R,S	four arm resistances	Ω

Valid when

Bridge balanced (galvanometer reads zero)
DC, steady state

Lesson: Resistivity Conductivity

Resistivity formula

R = \frac{ρ L}{A}

Resistance from material resistivity, length, cross-sectional area.

Symbol	Quantity	SI Unit
R	resistance	Ω
rho	resistivity	Ω*m
L	length	m
A	area	m^2

Valid when

Uniform conductor
Steady current

Lesson: Resistors Series Parallel

Resistors series/parallel

R_{ser} = \sum R_{i}; \frac{1}{R _{par}} = \sum \frac{1}{R _{i}}

Same current through series; same voltage across parallel.

Symbol	Quantity	SI Unit
R	equivalent	Ω
R_i	individual resistor	Ω

Valid when

Static linear network
Ideal wires

NEET question patterns in this unit

Lesson: Electrical Energy Power

Heating power: P = V^2/R = I^2*R. Compare two resistors in series/parallel.

Direct ApplicationEasy

Common distractors

uses wrong form

Picks I^2 R when V is constant or vice versa

Lesson: Electrical Resistance

Simple Ohm's law application: given two of V, I, R find the third.

Direct ApplicationEasy

Common distractors

misuses power formula

Uses P = VI as if I = P/R

Lesson: Kirchhoff's Laws

Multi-loop network requiring Kirchhoff's voltage and current laws to solve simultaneous equations.

Multi StepMedium

Common distractors

forgets sign convention

Mixes signs around loop

Lesson: Metre Bridge

Apply P/Q = R/S to find unknown resistance. Common in metre-bridge problems.

Direct ApplicationMedium

Common distractors

inverts ratio

Uses Q/P or S/R instead

Lesson: Resistors Series Parallel

Reduce a resistor network to equivalent. Often combines series and parallel sections.

Multi StepMedium

Common distractors

treats bridge as pure series parallel

Misses Wheatstone-like bridge structure

Lesson: Temperature Dependence Resistance

Temperature coefficient α: R(T) = R0(1 + α(T-T0)). Compare at two temperatures.

InterpretationEasy

Common distractors

treats semiconductor like metal

Uses α > 0 for semiconductors

Questions about this unit

What does Current Electricity cover for NEET Physics?: 12 lessons: Drift Velocity Mobility, Electric Current, Electrical Energy Power, Electrical Resistance, Internal Resistance EMF, Kirchhoff's Laws, Metre Bridge, Ohm's Law, Resistivity Conductivity, Resistors Series Parallel, Temperature Dependence Resistance and Wheatstone Bridge.
How often has Current Electricity come up in NEET past papers?: Our set of verified past papers has 18 questions from this unit, from NEET 2020, 2021, 2022, 2023, 2024 and 2026. Each is answered against the official NTA key.
Is the Current Electricity material free?: Yes. All 12 lessons and 96 practice questions are free, with no login needed.