🔍 Key Concepts

• Input impedance of measurement devices • Effect of a meter on the circuit it is connected to (meter as an added load) • Relationship between circuit loading and accurate voltage readings, especially in sensitive electronic circuits

💭 Think About

• If you place a meter across part of a circuit, how does the meter’s own resistance compare to the circuit resistance, and what happens to the measured voltage? • Which option talks about protecting the meter itself vs. protecting the accuracy of the circuit measurement? • In sensitive electronic circuits with high resistance values, would a low- or high-impedance meter change the circuit conditions more?

✅ Before You Answer

• Identify which choices mention circuit loading versus those that focus only on current through the meter • Check which explanation directly connects high impedance to accurate voltage readings in the original circuit • Eliminate any answer that suggests using different meters for AC vs. DC purely based on impedance, without mentioning circuit effects