Start learning →

JEE Main Current Electricity — practice questions

Explore 100 free Current Electricity questions in JEE Main Physics. Open each question or exercise to read its content, reference answers and available explanation.

Practise Current Electricity with Quill →

Current Electricity: quick revision

Choose current directions and apply charge conservation at junctions. Ohm’s law describes an ohmic conductor under fixed physical conditions. Reduce simple resistor combinations before applying loop equations to more complicated circuits.

Key ideas and when to use them

  • Ohmic resistor: $V=IR$.
  • Series: $R_s=\sum R_i$; parallel: $1/R_p=\sum1/R_i$.
  • Resistive power: $P=VI=I^2R=V^2/R$.

Common mistakes

  • Series resistors share current; parallel resistors share voltage.
  • A battery’s terminal voltage can differ from its emf when internal resistance matters.

Three worked examples

Example 1: An ideal 12 V source is connected across a 4 Ω ohmic resistor. Find the current.
  1. Ignore source internal resistance as stated.
  2. $I=12/4$.

3 A

Example 2: Find the equivalent resistance of 6 Ω and 3 Ω in parallel.
  1. For two resistors, $R_p=R_1R_2/(R_1+R_2)$.
  2. $R_p=6\times3/(6+3)$.

2 Ω

Example 3: A 5 Ω resistor carries 2 A. Find its dissipated power.
  1. Use the known current and resistance.
  2. $P=2^2\times5$.

20 W

Qallery AI-assisted study notes and original examples. Further reading: NCERT Physics — Current Electricity.

Put it into practice

Continue with Current Electricity practice for JEE Main. Read explanations as you go. No signup form needed to start.

Practise Current Electricity →

Current Electricity questions and exercises with answers

Showing questions 1–30 of 100.

The SI unit of electric current is:Read the answer and worked solution →The current I is related to charge q and time t by:Read the answer and worked solution →Electric current is a:Read the answer and worked solution →Ohm's law states V = ___ ?Read the answer and worked solution →The SI unit of resistance is:Read the answer and worked solution →For resistors in series, the equivalent resistance is:Read the answer and worked solution →For resistors in PARALLEL, the equivalent resistance is given by:Read the answer and worked solution →Kirchhoff's Current Law (KCL) is based on conservation of:Read the answer and worked solution →Kirchhoff's Voltage Law (KVL) is based on conservation of:Read the answer and worked solution →A galvanometer can be CONVERTED to an ammeter by:Read the answer and worked solution →Find the equivalent resistance of 2 Ω and 3 Ω connected in SERIES:Read the answer and worked solution →Find the equivalent resistance of 6 Ω and 3 Ω in PARALLEL:Read the answer and worked solution →A battery with emf 12 V and internal resistance 1 Ω drives 2 A current. Find terminal voltage V:Read the answer and worked solution →Resistance R of a conductor is proportional to:Read the answer and worked solution →Two resistors 4 Ω and 12 Ω are in parallel; this combination is in series with 8 Ω. Total resistance:Read the answer and worked solution →Drift velocity v_d is given by:Read the answer and worked solution →In a Wheatstone bridge, BALANCE condition gives:Read the answer and worked solution →A 2 Ω, 4 Ω and 6 Ω resistor are in parallel. Equivalent resistance:Read the answer and worked solution →To convert a galvanometer to a VOLTMETER, connect:Read the answer and worked solution →Three cells of emf 2 V each, internal resistance 0.5 Ω each, are connected in series. Total emf and internal resistance:Read the answer and worked solution →Three identical cells with emf 1.5V and internal resistance 0.6 Ω each are connected in parallel. Find equivalent emf and internal resistance:Read the answer and worked solution →If a wire of resistance R is cut into 4 equal parts and joined in parallel, the new resistance is:Read the answer and worked solution →A potentiometer is a NULL device used to:Read the answer and worked solution →A 10 V battery is connected across a 5 Ω resistor. The current through the resistor is:Read the answer and worked solution →Specific resistivity (ρ) of a conductor depends mainly on:Read the answer and worked solution →An ammeter has 0.1 Ω resistance and 1 mA full-scale current. The shunt needed to extend range to 1 A:Read the answer and worked solution →In a Wheatstone bridge: P = 4Ω, Q = 8Ω, R = 6Ω. For balance, S =Read the answer and worked solution →Five identical bulbs are connected in series across an emf of 100V. Each bulb has resistance 5 Ω. Find total current:Read the answer and worked solution →A 12V battery (internal r = 0.5 Ω) drives current through 5.5 Ω external load. Find power dissipated in EXTERNAL resistor:Read the answer and worked solution →A copper wire of length 1 m and cross-section 1 mm² has resistivity 1.7 × 10⁻⁸ Ω·m. Its resistance is:Read the answer and worked solution →

Worked practice questions

The SI unit of electric current is:

  1. ohm
  2. volt
  3. coulomb
  4. ampere
Show answer and solution

Correct answer: D. ampere

Electric current = rate of flow of charge. **SI unit:** ampere (A) = coulomb/second. Volt is for potential difference, coulomb for charge, ohm for resistance.

Open this question →

The current I is related to charge q and time t by:

  1. I = q/t (rate of charge flow)
  2. I = q − t
  3. I = q + t
  4. I = q × t
Show answer and solution

Correct answer: A. I = q/t (rate of charge flow)

I = dq/dt — current is the rate of flow of charge. In steady state, I = q/t.

Open this question →

Electric current is a:

  1. Vector quantity
  2. Neither
  3. Scalar quantity
  4. Both
Show answer and solution

Correct answer: C. Scalar quantity

Although current has direction in a circuit, it doesn't follow vector addition laws (currents don't add vectorially at junctions but algebraically). **Hence treated as scalar.**

Open this question →

How to practise

  1. Choose a Current Electricity question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Current Electricity practice for JEE Main. Read explanations as you go. No signup form needed to start.

Practise Current Electricity →

More Physics topics

Electric Charges and FieldsMechanical Properties of Solids and FluidsSemiconductor ElectronicsWave OpticsUnit 2A: Newton's Laws and Translational EquilibriumMoving Charges and MagnetismAtoms and NucleiRay Optics and Optical Instruments