Which instrument is listed as measuring electrical power?

Which instrument is listed as measuring electrical power?

• A. Voltmeter
• B. Ammeter
• C. Ohmmeter
• D. Multimeter

Answer: (A)

Power in an electrical circuit is found by multiplying voltage by current (P = V × I). To know power directly, you’d use a wattmeter, but with common tools you can determine it by measuring the two needed quantities. A voltmeter reads voltage, but it doesn’t give current by itself, so you’d still need another instrument to read current. An ohmmeter measures resistance and isn’t used on powered circuits. An ammeter measures current, not voltage. A multimeter is capable of reading both voltage and current, so you can calculate power from those readings, or use models that display watts directly. That makes the multimeter the most practical choice for determining electrical power among the options.

Power in an electrical circuit is found by multiplying voltage by current (P = V × I). To know power directly, you’d use a wattmeter, but with common tools you can determine it by measuring the two needed quantities. A voltmeter reads voltage, but it doesn’t give current by itself, so you’d still need another instrument to read current. An ohmmeter measures resistance and isn’t used on powered circuits. An ammeter measures current, not voltage. A multimeter is capable of reading both voltage and current, so you can calculate power from those readings, or use models that display watts directly. That makes the multimeter the most practical choice for determining electrical power among the options.