Electrical & electronic units table
Unit Name | Unit Symbol | Quantity |
A | Electric current (I) | |
V | Voltage (V, E) Electromotive force (E)Electric potential (φ) | |
Ω | Resistance (R) Impedance (Z) | |
W | Electric power (P) | |
dBm | Electric power (P) | |
Volt-Ampere-Reactive | VAR | Reactive power (Q) |
Volt-Ampere | VA | Apparent power (S) |
F | Capacitance (C) | |
H | Inductance (L) | |
S | Conductance (G) Admittance (Y) | |
C | Electric charge (Q) | |
A·h | Electric charge (Q) | |
J | Energy (E) | |
kWh | Energy (E) | |
Ohm-meter | Ω∙m | Resistivity (ρ) |
siemens per meter | S/m | Conductivity (σ) |
Volts per meter | V/m | Electric field (E) |
Newtons per coulomb | N/C | Electric field (E) |
Volt-meters | V·m | Electric flux (Φe) |
T | Magnetic field (B) | |
Gauss | G | Magnetic field (B) |
Wb | Magnetic flux (Φm) | |
Hz | Frequency (f) | |
Seconds | s | Time (t) |
Meter / metre | m | Length (l) |
Square-meter | m2 | Area (A) |
Units prefix table
Prefix | Prefix Symbol | Prefix factor | Example |
pico | p | 10-12 | 1pF = 10-12F |
nano | n | 10-9 | 1nF = 10-9F |
micro | μ | 10-6 | 1μA = 10-6A |
milli | m | 10-3 | 1mA = 10-3A |
kilo | K | 10 3 | 1KΩ = 1000Ω |
mega | M | 10 6 | 1MHz = 106Hz |
giga | G | 10 9 | 1GHz = 109Hz |
Electrical units definitions
Volt (V)
Volt is the electrical unit of voltage.One volt is the energy of 1 joule that is consumed when electric charge of 1 coulomb flows in the circuit.
1V = 1J / 1C
Ampere (A)
Ampere is the electrical unit of electrical current. It measures the amount of electrical charge that flows in an electrical circuit per 1 second.1A = 1C / 1s
Ohm (Ω)
Ohm is the electrical unit of resistance.1Ω = 1V / 1A
Watt (W)
Watt is the electrical unit of electric power. It measures the rate of consumed energy.1W = 1J / 1s
1W = 1V · 1A
dBm
dBm is a unit of electric power, measured in dB-milliwatts.1dBm = 10 · log10(1.2589mW / 1mW)
Farad (F)
Farad is the unit of capacitance. It represents the amount of electric charge in coulombs that is stored per 1 volt.1F = 1C / 1V
Henry (H)
Henry is the unit of inductance.1H = 1Wb / 1A
siemens (S)
siemens is the unit of conductance, which is the opposite of resistance.1S = 1 / 1Ω
Coulomb (C)
Coulomb is the unit of electric charge.1C = 6.238792×1018 electron charges
Ampere-hour (Ah)
Ampere-hour is a unit of electric charge.One ampere-hour is the electric charge that flow in electrical circuit, when a current of 1 ampere is applied for 1 hour.
1Ah = 1A · 1hour
One ampere-hour is equal to 3600 coulombs.1Ah = 3600C
Tesla (T)
Tesla is the unit of magnetic field.1T = 1Wb / 1m2
Weber (Wb)
Weber is the unit of magnetic flux.1Wb = 1V · 1s
Joule (J)
Joule is the unit of energy.1J = 1 kg · 1(m / s)2
Kilowatt-hour (kWh)
Kilowatt-hour is a unit of energy.1kWh = 1000W · 1h
Hertz (Hz)
Hertz is the unit of frequency. It measures the number of cycles per second.1 Hz = 1 cycles / s
