AC voltmeter is the instrument for measuring the voltage of:
举一反三
- The instrument for measuring real power is the:
- _____is an instrument for measuring the vital capacity of the lungs .
- The effective value of ac voltage or current is（ ） A: The average value of a voltage or current B: DC equal to the AC thermal effect is defined as the effective value of AC C: voltage or current are 0.707 of their amplitudes D: closely related to the frequency of alternating current
- A major application of the diode is in the production of a dc voltage from an ac supply, ______ as rectification.
- 在NSTL(国家科技图书文献中心)检索题为“Temperature coefficient measuring methods of output voltage and output current for multi-junction solar cells and modules”的标准,标准号为: