For the use of watts as a measurement of transmitter power in Radio, see Effective radiated power and Nominal power.
Watt thermal (abbreviation: Wt). This is a term that refers to thermal power produced. SI prefixes can be used, for example megawatt thermal (MWt) and gigawatt thermal (GWt).
For example, a Nuclear power plant might use a fission reactor to generate heat (thermal output) which creates steam to drive a turbine to generate electricity. See Nuclear proliferation for discussion of a reactor that generates 200 MWt (50 MWe), and another reactor that generates 800 MWt (200 MWe).
| SI electromagnetic units ---- | |||
|---|---|---|---|
| Current | Ampere (SI base unit) | A | A |
| Electric charge, Quantity of electricity | Coulomb | C | A新 |
| Potential difference | Volt | V | J/C = kg搶2新−3嫂−1 |
| Resistance, Impedance, Reactance | Ohm | Ω | V/A = kg搶2新−3嫂−2 |
| Resistivity | Ohm Metre | Ω搶 | kg搶3新−3嫂−2 |
| Electrical power | watt | W | V嫂 = kg搶2新−3 |
| Capacitance | Farad | F | C/V = kg−1搶−2嫂2新4 |
| Elastance | reciprocal Farad | F−1 | kg搶2嫂−2新−4 |
| Permittivity | Farad per Metre | F/m | kg−1搶−3嫂2新4 |
| Conductance, Admittance, Susceptance | siemens | S | Ω−1 = kg−1搶−2新3嫂2 |
| Conductivity | siemens per Metre | S/m | kg−1搶−3新3嫂2 |
| Magnetic flux | weber | Wb | V新 = kg搶2新−2嫂−1 |
| Magnetic flux density | tesla | T | Wb/m2 = kg新−2嫂−1 |
| Magnetic induction | Ampere per Metre | A/m | A搶−1 |
| Reluctance | Ampere-turns per weber | A/Wb | kg−1搶−2新2嫂2 |
| Inductance | henry | H | Wb/A = V新/A = kg搶2新−2嫂−2 |
| Permeability | henry per Metre | H/m | kg搶新−2嫂−2 |
| Magnetic susceptibility | (dimensionless) | χ | - |