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16. The symbol of specific heat capacity unit is correct A J/kg·K B J·Kg-1·K-1 C J/kg·K-1 D J/kg/K What, why, mainly why
The specific heat capacity refers to the heat absorbed or released when the temperature of a unit mass object rises or falls, so the unit is J / kg / K, choose B
What are the symbols of specific heat capacity and heat capacity?
Volume represents an object__________ The main unit of Si is________ .
Volume represents an object_____ Space occupied_____ The main unit of Si is____ m³ ____ .
The main unit of the international system of units
The title is like this
International system of units:_______________________ The main unit is:______________________ .
Other units:_______________________ .
Meters (m), kilogram (kg), second (s), ampere (a), Kelvin (k) and candela (CD), and the unit mole (mol) of mass are taken as the main units
The international system of units has two auxiliary units, radian and sphericity
Composite international system of units
The international unit of quantity (length, volume,...) .
Seven basic international units:
Length: M
Weight: kg
Time: seconds
Current: Ampere
Temperature: Kelvin
Amount of matter: Mole
Luminous intensity: Candela
All other units can be derived from these seven units, such as volume: cubic meter
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- 7. The distance that a moving object passes through is called the distance. It can be represented by symbols. In the international system of units, its main unit is the distance
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- 14. For example, "L" R
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- 17. P = UI is used to calculate electric power! If u is not the rated voltage, can it still be used? A consumer marked with 220 V and 40 W is connected to the circuit with 110 V voltage, and the resistance remains unchanged. Why can't P = UI be used to solve this problem? Why can r = u ^ 2 / P, P = u ^ 2 / R be used only? And for example, 1000 watt hour is the small consumption of 1 kW consumer in one hour? Why does 500 W consumer consume a lot of J in one hour?
- 18. On the problem of physical electric power formula, because r = u / I, so u = RI, why P = RI * I = I & # r because P = UI On the problem of physical electric power formula, because r = u / I, u = RI Why is p = RI * I = I & # r because P = UI Why is p = u * (U / R) = u & # / r because P = UI How to put these formulas into the topic
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