Does an AC ammeter indicate peak, average,...

Does an AC ammeter indicate peak, average,...

Question 1 of 270700uWG8b5PeplFnYhYjwAc

Does an AC ammeter indicate peak, average, or effective values of current?

Question 1 of 27070

Q

Does an AC ammeter indicate peak, average, or effective values of current?

🔍 Key Concepts

• AC measurement terminology: know the difference between peak, average, and effective values for a sine-wave current • RMS (root mean square) value: how it relates to the DC value that would produce the same heating effect in a resistor • How conventional analog AC ammeters (with rectifiers or moving-iron movements) are calibrated for power and heating effects

💭 Think About

• For shipboard AC power systems, which current value (peak, average, or effective) is most useful for sizing cables and protecting equipment from overheating? • If a DC ammeter and an AC ammeter both read 10 units while feeding the same resistor, which reading should produce the same heating effect? What is that AC quantity called? • Think about what electricians mean when they say "120 volts AC" on a receptacle—are they usually referring to peak, average, or another specific value?

✅ Before You Answer

• Be clear on the definition of RMS (root mean square) and its role in AC measurements • Recall which quantity (peak, average, or RMS/effective) is directly related to power/heat in a resistive load • Carefully read the wording of each choice, especially any unfamiliar abbreviations like TRM versus RMS