What Electric Current Is
Traffic count for charges
↳ Current counts coulombs passing per second.
📚 Chapter Learning Kit
Electricity · Class 10 Science
English 4 topics 217 leveled MCQs 88 flashcards 4 games Free
Shared by a Veda teacher · Generated with Veda AI
⚡ Veda Bites
📖 Definition
⭐ Important Fact
📖 Definition
💡 Key Idea
🚫 Warning
📖 Definition
The whole idea, one bite at a time
Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. Here's a taste from this kit; the app has the full deck.
The Coulomb and the Electron
How big is one coulomb?
↳ A coulomb is six billion billion electrons.
The Ampere
The unit on every charger
↳ 1 A = 1 C/s; know your milli and micro.
Ohm's Law
The most important line in this chapter
↳ V ∝ I at constant temperature — that's Ohm's law.
'…At Constant Temperature'
The condition everyone forgets
↳ No constant temperature, no straight line.
Resistance and the Ohm
Opposition, quantified
↳ R = V/I; one ohm = one volt per ampere.
📖 Smart notes
What you'll study, topic by topic
1
Electric Current, Potential Difference and Circuits
What electric current really is, the coulomb and the ampere, potential difference and the volt, circuit diagrams with their symbols, and how ammeters and voltmeters are connected.
- Electric current is the rate of flow of electric charge: I = Q/t.
- SI unit of charge: coulomb (C); 1 C is the charge of about 6 × 10¹⁸ electrons (one electron carries 1.6 × 10⁻¹⁹ C).
- SI unit of current: ampere (A); 1 A = 1 coulomb per second. Small currents: mA (10⁻³ A), μA (10⁻⁶ A).
~30 min · full explanation, examples & memory tricks in the app
2
Ohm's Law, Resistance and Resistivity
V = IR and the experiment behind it, what resistance is and what it depends on, the R = ρl/A relation, resistivity of materials, and the rheostat.
- Ohm's law: at constant temperature, the current through a conductor is directly proportional to the potential difference across it — V = IR.
- The V–I graph of an ohmic conductor is a straight line through the origin; its slope (V against I) equals the resistance R.
- Resistance is the opposition a conductor offers to current: R = V/I. Unit: ohm (Ω); 1 Ω = 1 volt per ampere.
~40 min · full explanation, examples & memory tricks in the app
3
Resistors in Series and Parallel
The two ways to combine resistors — the rules, the derivations, the shortcut tricks, why homes are wired in parallel, and the mixed-combination numericals boards love.
- Series: one path — the SAME CURRENT flows through every resistor; the voltage divides (V = V₁ + V₂ + V₃).
- Series equivalent: Rs = R₁ + R₂ + R₃ — always LARGER than the largest resistor.
- Parallel: many paths — the SAME VOLTAGE across every resistor; the current divides (I = I₁ + I₂ + I₃).
~40 min · full explanation, examples & memory tricks in the app
4
Heating Effect of Current and Electric Power
Joule's law H = I²Rt, why heaters glow but their cords don't, the fuse, electric power P = VI = I²R = V²/R, the kilowatt-hour, and the electricity-bill numericals.
- When charge flows through a resistance, the work done by the source appears as heat: this is the heating (Joule) effect.
- Joule's law: H = I²Rt — heat produced is proportional to the square of the current, the resistance, and the time.
- Since H ∝ I², doubling the current makes FOUR times the heat — the square matters.
~40 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
217 questions laddered from warm-up to topper-level, each with an explanation. A taste:
Consider these statements about electric current. I. It is the rate of flow of charge. II. Its SI unit is the ampere. III. In a metal the moving charges are electrons. IV. Conventional current flows in the same direction as the electrons. Which statements are correct?
Advanced
A I, II and III only
B I and IV only
C II and III only
D All four
Show answer & explanation
I, II and III only
I, II and III are correct. IV is the reverse of the truth — conventional current runs from + to − outside the cell, while electrons drift from − to +.
A charge of one coulomb passes a point in one second. The current is:
Intermediate
A 1 V
B 1 C
C 1 W
D 1 A
Show answer & explanation
1 A
One ampere is defined as one coulomb per second, so I = Q/t = 1/1 = 1 A.
A torch bulb draws 300 mA. Expressed in amperes this is:
Intermediate
A 0.3 A
B 3 A
C 0.03 A
D 300 A
Show answer & explanation
0.3 A
1 mA = 10⁻³ A, so 300 mA = 300 × 10⁻³ = 0.3 A.
A current of 2 A flows through a lamp for half a minute. The charge that passes through it is:
Intermediate
A 1 C
B 30 C
C 120 C
D 60 C
Show answer & explanation
60 C
Q = It with the time in seconds: Q = 2 × 30 = 60 C. Leaving the time in minutes is the usual slip.
🃏 Flashcards
Tap a card to flip it
88 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
🎮 Learning games
Play your way through this kit
Every game is built from this kit's own content — scores feed your mastery, so playing counts as studying.
Word Match
Word Scramble
True False
Fill Blank
Playable in the app
Study it properly — free, in the app
The full Veda Bites deck, complete notes, spaced-repetition flashcards, leveled MCQs, tests and games for this kit — plus Daily Facts and the Arena, every day.