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The word "milliamp" is short for "milliampere." Learn more. A milliamp (mA) is a unit of measurement for an electric current flowing through an electrical conductor and a measure of the rate of flow of electrons. The prefixes exa (1 quintillion) and peta (1 quadrillion) were added to the International System of Units in 1975. The SI prefix "milli" represents a factor of 10-3, or in exponential notation, 1E-3.. The SI definition given by the International Committee for Weights and Measures (CIPM) says: "The quantity dose equivalent H is the product of the absorbed dose D of ionizing radiation and the dimensionless factor Q (quality factor) defined as a function of linear energy transfer by the ICRU" . Millicurie definition, a unit of radioactivity equal to one thousandth of a curie; 3.70 × 107 disintegrations per second. Tera (1 trillion) comes from the Greek word teras or teratos, meaning "marvel, monster," and has been in use since approximately 1947. The metric system unit becquerel, a measure of radioactive decay, is measured in inverse seconds. We may write h W = 169 000 mm = 16 900 cm = 169 m = 0.169 km using the millimeter (SI prefix milli, symbol m), centimeter (SI prefix centi, symbol c), or kilometer (SI prefix kilo, symbol k). You use two probes to measure parts of the circuit, ports to insert the probes, and usually a dial or a selection of buttons to choose the mode. A milliamp is a unit used to measure electrical current and is equal to one one-thousandth of an ampere. But adding milli-to “meter” creates “millimeter,” which means one thousandth of a meter. Milli-(symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10 −3).Proposed in 1793 and adopted in 1795, the prefix comes from the Latin mille, meaning "one thousand" (the Latin plural is milia).Since 1960, the prefix is part of the International System of Units (SI). The ampere is the basic SI unit used to measure current, as established in 1948. So 1 millihectare = 10-3 hectares.. Abbreviation: mCi, mc See more. The definition of a hectare is as follows: A hectare (symbol ha) is a metric unit of surface area, equal to 100 ares (the name is a contraction of the SI prefix hecto + are). ››Definition: Millihectare. SI Prefixes and Units Multimeters return a result in SI (the standard scientific) units for voltage, current and resistance, which are volts (V), amps (A) and ohms (Ω), respectively. milli- meaning: 1. Definition CIPM definition of the sievert. Define milliliter. n. Abbr. However, the origin and history of peta with data measurement … The abbreviation for "ampere" is "A," and the abbreviation for "milliampere" is "mA." The meter is defined in terms of the speed of light and the second; definitions of the metric base units kilogram, ampere, kelvin, and candela also depend on the second. In the international system of units (SI units), electrical current is measured in amperes (or amps), and abbreviated as “A”. 0.001 or one thousandth of the stated unit: 2. one thousandth, used in units of measure: 3. a…. Below is a table of the most commonly used metric prefixes that can be added to the basic units of measurement. Definition - What does Milliamp (mA) mean? milliliter synonyms, milliliter pronunciation, milliliter translation, English dictionary definition of milliliter. The roentgen or röntgen (/ ˈ r ɜː n t ɡ ə n /; symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air (statcoulomb per kilogram). The only base unit whose definition does not depend on the second is the mole. 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