Lab Rangkaian & Hukum Ohm
Susun rangkaian, geser tegangan dan resistansi, dan saksikan hukum Ohm V = I·R menyalakannya — dengan seri vs paralel bersanding.
Ini adalah penyelesai rangkaian DC yang tepat — tanpa angka palsu. Pilih prasetel atau tambahkan resistor, beralih antara seri dan paralel, dan atur tegangan baterai serta setiap resistansi. Saksikan arus I = V/R mengalir sebagai pembawa muatan, bohlam menyala sesuai dayanya, dan tabel menunjukkan bagaimana rangkaian seri berbagi satu arus sementara cabang paralel berbagi satu tegangan.
Prasetel
Rincian per resistor
| R | Jatuh tegangan | Arus | Daya |
|---|
Resistor terpilih
Ketuk resistor di kanvas, sebuah chip, atau baris pada tabel untuk membaca jatuh tegangan, arus, dan dayanya — serta mengatur resistansinya secara langsung.
Rumus & sumber
V = I·R
P = V·I = I²R = V²/R
Seri: R = Σ Rᵢ
Paralel: 1/R = Σ 1/Rᵢ
The units and constants behind this circuit
Ohm's law connects three quantities, and one of them — the ampere — is defined by a constant you can count: the charge on a single electron.
The constant that defines the ampere
- e = 1.602176634 × 10⁻¹⁹ C Elementary charge · exact since 2019 — the ampere is defined by fixing this number
What one ampere actually is: electrons per second
| Current draw | Current | Electrons per second |
|---|---|---|
| An indicator LED | 0.02 A | 1.25 × 10^17 / s |
| Phone charger | 2 A | 1.25 × 10^19 / s |
| Microwave oven | 10 A | 6.24 × 10^19 / s |
Calculated live as I / e, using the CODATA value of the elementary charge from our constants page. One ampere is 1 coulomb per second, and one coulomb is 1/e ≈ 6.24 × 10¹⁸ electrons.
The ampere used to be defined by two wires
Until 2019 the ampere was defined by the force between two infinitely long parallel wires one metre apart — a definition nobody could actually build. Since May 2019 it is defined by fixing the elementary charge at exactly 1.602176634 × 10⁻¹⁹ coulombs. The current in this simulator is, quite literally, a count of electrons.
See all seven defining constants →