What is the recommended tool for measuring the capacity of electrical circuits?

The recommended tool for measuring the capacity of electrical circuits is the multimeter. A multimeter is versatile and can perform a variety of measurements including voltage, current, and resistance, making it essential for diagnosing issues in electrical circuits. It combines the functionalities of a voltmeter, ammeter, and ohmmeter, which allows technicians to assess the health and performance of different components within a circuit effectively.

While a voltmeter is specifically designed to measure voltage, it cannot measure current or resistance. An oscilloscope, on the other hand, is used primarily for visualizing the waveform of electrical signals rather than measuring capacity directly. Lastly, a frequency generator is used to generate specific frequencies for testing and does not have the measuring capabilities needed to evaluate the capacity of electrical circuits. Hence, the multimeter stands out as the most appropriate tool for this purpose.