Category: 2. Electrical Units

Volt definition Volt is the electrical unit of voltage or potential difference (symbol: V). One Volt is defined as energy consumption of one joule per electric charge of one coulomb. 1V = 1J/C One volt is equal to current of 1 amp times resistance of 1 ohm: 1V = 1A ⋅ 1Ω Alessandro Volta The… Continue reading Volt (V)

Ohm (symbol Ω) is the electrical unit of resistance. The Ohm unit was named after George Simon Ohm. 1Ω = 1V / 1A = 1J ⋅ 1s / 1C2 Table of resistance values of Ohm name symbol conversion example milli-ohm mΩ 1mΩ = 10-3Ω R0 = 10mΩ ohm Ω – R1 = 10Ω kilo-ohm kΩ 1kΩ = 103Ω… Continue reading Ohm (Ω)

Kilowatt-hour definition Kilowatt-hour is an energy unit (symbol kWh or kW⋅h). One kilowatt-hour is defined as the energy consumed by power consumption of 1kW during 1 hour: 1 kWh = 1kW ⋅ 1h One kilowatt-hour is equal to 3.6⋅106 joules: 1 kWh = 3.6⋅106 J The energy E in kilowatt-hour (kWh) is equal to the power P… Continue reading What is kilowatt-hour (kWh)?

Kilowatt definition One kilowatt (kW) is equal to 1000 watts (W): 1kW = 1000W One kilowatt is defined as energy consumption of 1000 joules for 1 second: 1kW = 1000J / 1s One kilowatt is equal to 1000000 milliwatts: 1kW = 1000000mW Kilowatt examples Example #1 What is the power consumption in kW when energy… Continue reading What is kilowatt (kW)?

kVA is kilo-volt-ampere. kVA is a unit of apparent power, which is electrical power unit. 1 kilo-volt-ampere is equal to 1000 volt-ampere: 1kVA = 1000VA 1 kilo-volt-ampere is equal to 1000 times 1 volt times 1 ampere: 1kVA = 1000⋅1V⋅1A kVA to volt-amps calculation The apparent power S in volt-amps (VA) is equal to 1000… Continue reading Kilovolt-amp (kVA)

Farad is the unit of capacitance. It is named after Michael Faraday. The farad measures how much electric charge is accumulated on the capacitor. 1 farad is the capacitance of a capacitor that has charge of 1 coulomb when applied voltage drop of 1 volt. 1F = 1C / 1V Table of capacitance values in Farad… Continue reading Farad (F)

Decibel (dB) definition Decibel (Symbol: dB) is a logarithmic unit that indicates ratio or gain. Decibel is used to indicate the level of acoustic waves and electronic signals. The logarithmic scale can describe very big or very small numbers with shorter notation. The dB level can be viewed as relative gain of one level vs.… Continue reading What is a decibel (dB)?

dBW definition dBW or decibel-watt is a unit of power in decibel scale, referenced to 1 watt (W). The power in decibel-watts (P(dBW)) is equal to 10 times base 10 logarithm of the power in watts (P(W)): P(dBW) = 10 ⋅ log10( P(W) / 1W) The power in watts (P(W)) is equal to 10 raised by the power in decibel-watts (P(dBW)) divided… Continue reading Decibel-Watt (dBW)

dBm definition dBm or decibel-milliwatt is an electrical power unit in decibels (dB), referenced to 1 milliwatt (mW). The power in decibel-milliwatts (P(dBm)) is equal to 10 times base 10 logarithm of the power in milliwatts (P(mW)): P(dBm) = 10 ⋅ log10( P(mW) / 1mW) The power in milliwatts (P(mW)) is equal to 1mW times 10 raised by the power in… Continue reading Decibel-milliwatt (dBm)

Ampere definition Ampere or amp (symbol: A) is the unit of electrical current. The Ampere unit is named after Andre-Marie Ampere, from France. One Ampere is defined as the current that flows with electric charge of one Coulomb per second. 1 A = 1 C/s Amperemeter Ampere meter or ammeter is an electrical instrument that… Continue reading Ampere unit