It is () A. Ampere B. volt C. Joule D. ohm

It is () A. Ampere B. volt C. Joule D. ohm

In history, Ohm successfully revealed the relationship between current, voltage and resistance, and thus obtained the famous Ohm's law

What is the meaning of building electrical drawing symbol cdb6 -- 63 / 1pc16a

Cdb6 micro break model
63 - frame current 63A
1p monopole
C - trip curve, C curve for general distribution protection and D curve for motor protection
16A - rated current 16A

A group of triangle connected three-phase symmetrical load, each phase resistance is 12 ohm, reactance is 12 ohm, the effective value of voltage connected to the line is 380V, calculate the active power P of the load
And power factor

Because it is a triangle connection, the phase voltage is equal to the line voltage! The active power refers to the power consumed on the resistance! If the resistance value is known, just calculate the current value! I = 380 / sqrt (12 * 12 + 12 * 12) = 22.35a
Three phase active power = 3 * 22.35 * 22.35 * 12 = 18kw
The calculation method of power factor is the same as that of "hndqlimou"!
The error of hndqlimou's active power calculation is that the up in "PP = up ^ 2 / Z" should refer to the voltage at both ends of the resistance, not the phase (line) voltage!