Chapter 17 of 30
Concept Maps
Electric Current — Concept Maps
NIOS · Class 12 · Physics
4 concept maps of Electric Current for NIOS Class 12 Physics, each also written out as a text outline. Part of the NIOS Class 12 Physics syllabus.
45 questions35 flashcards18 formulas & key relations5 concepts
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4 Concept Maps
Electric Current – Complete Chapter Overview
The map in words
- Electric Current
- Basic Concepts
- Definition
- Rate of charge flow
- I = dq divided by dt
- Unit is Ampere
- Drift Velocity
- I = nAev_d
- Order 10 power minus 4 m/s
- Caused by electric field
- Definition
- Ohms Law
- V = IR
- Ohmic conductors
- Metals
- Linear I-V graph
- Non-ohmic
- Diodes
- Transistors
- Nonlinear I-V graph
- Resistance R = ρl divided by A
- Resistivity ρ
- Material property only
- Unit is Ohm-metre
- ρ = m divided by ne squared τ
- Combinations
- Series
- Same current
- R_eq = R1 + R2 + ...
- Voltage divides
- Parallel
- Same voltage
- 1/R_eq = 1/R1 + 1/R2
- Current divides
- Series
- EMF and Cells
- Terminal Voltage V = E - Ir
- Primary cells
- Non-rechargeable
- Dry cell
- Secondary cells
- Rechargeable
- Lead-acid battery
- Kirchhoffs Rules
- KCL Junction Rule
- Sum I = 0
- Charge conservation
- KVL Loop Rule
- Sum V = 0
- Energy conservation
- KCL Junction Rule
- Wheatstone Bridge
- Balance P/Q = R/S
- Null method
- Finds unknown resistance
- Potentiometer
- Null method
- No current at balance
- EMF comparison E1/E2 = l1/l2
- Internal resistance r = R times l1/l2 minus 1
- Power and Heating
- P = VI = I squared R = V squared / R
- Joule Heat Q = I squared Rt
- Unit Watt
- 1 kWh = 3.6 MJ
- Basic Concepts
Physics Numerical Problem-Solving Strategy for Electric Current
The map in words
- Read the Question Carefully
- Write GIVEN Section\nList all values with units
- Write TO FIND Section\nState what is asked
- Select the Formula\neg R = V divided by I or I = nAev_d
- Unit Conversion Needed?
- Yes: Convert to SI Units\neg mm to m, mA to A
- Substitute Values\nwith units in formula
- Perform Calculation\nStep by step
- Write Final Answer\nwith correct SI unit
- Cross-check using\nalternate method if possible
- Write Final Answer\nwith correct SI unit
- Perform Calculation\nStep by step
- Substitute Values\nwith units in formula
- Yes: Convert to SI Units\neg mm to m, mA to A
- Unit Conversion Needed?
- Select the Formula\neg R = V divided by I or I = nAev_d
- Write TO FIND Section\nState what is asked
- Write GIVEN Section\nList all values with units
Electric Current — Complete Chapter Mind Map
The map in words
- Electric Current
- Basic Concepts
- Definition I = dQ/dt
- Unit Ampere
- Conventional vs Electron Flow
- Drift Velocity vd = eEτ/m
- I = nAevd
- Ohms Law
- V = IR
- Ohmic Conductors
- Metals
- Linear I-V graph
- Non Ohmic Conductors
- Diode Transistor
- Nonlinear I-V graph
- Resistance and Resistivity
- R = ρl divided by A
- ρ depends on material and temp
- Temperature Dependence
- Metals positive α
- Semiconductors negative α
- Alloys near zero α
- Superconductors
- Grouping of Resistors
- Series R = R1 + R2 + R3
- Same current
- Voltage divides
- Parallel 1 over R = sum of 1 over Ri
- Same voltage
- Current divides
- Series R = R1 + R2 + R3
- EMF and Cells
- V = E minus Ir
- Primary Cells
- Not rechargeable
- Dry cell Daniel cell
- Secondary Cells
- Rechargeable
- Lead acid accumulator
- Kirchhoffs Rules
- Junction Rule KCL
- Sum I = 0
- Conservation of charge
- Loop Rule KVL
- Sum E = Sum IR
- Conservation of energy
- Junction Rule KCL
- Wheatstone Bridge
- Balance P over Q = R over S
- Null method
- Measures unknown resistance
- Potentiometer
- k = E divided by L
- V = k times l1
- Compare EMFs E1 over E2 = l1 over l2
- Internal resistance r = R times l1 over l2 minus 1
- Power and Heating
- P = VI = I squared R = V squared over R
- Joule Law H = I squared Rt
- 1 kWh = 3.6 times 10 to 6 J
- Basic Concepts
Electric Current
The map in words
- Electric Current
- Definition and Units
- Ohm's Law
- Resistance and Resistivity
- Grouping of Resistors
- EMF and Internal Resistance
- Kirchhoff's Rules
- Wheatstone Bridge
- Potentiometer
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Explore DiagramsFrequently Asked Questions
What are the important topics in Electric Current for NIOS Class 12 Physics?
Key topics in Electric Current include Electric Current — Definition and Basics, Ohm's Law, Resistance and Resistivity, Grouping of Resistors — Series and Parallel, EMF, Internal Resistance, and Types of Cells. Study these first, then practise questions on each for the NIOS Class 12 board exam.
What do the concept maps for Electric Current show?
The 4 maps show how the ideas in Electric Current connect: Electric Current – Complete Chapter Overview; Physics Numerical Problem-Solving Strategy for Electric Current. Each map is also written out as an outline on this page.
How should I revise Electric Current for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Electric Current. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Electric Current
Practice Quiz
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Important Questions
Exam-style questions with answers
Revision Notes
Key points for last-minute revision
Formula Sheet
The chapter's formulas in one place
Chapter Summary
Understand the chapter at a glance
Study Plan
Step-by-step plan for this chapter
Flashcards
Quick-fire cards for active recall
Syllabus
What topics to cover
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