🔍 Key Concepts

• Series vs. shunt resistors in meter circuits • How a basic meter movement (like a galvanometer) is converted into a voltmeter vs. an ammeter • Effect of adding internal resistance on current and voltage measurement ranges

💭 Think About

• Which type of instrument needs a large internal resistance so that only a small current flows through the movement? • Which type of instrument instead needs a low-resistance shunt path so that most of the current bypasses the movement? • Think about what happens to the meter reading if you place a big resistor in series versus in parallel with the movement.

✅ Before You Answer

• Identify which instrument must have high internal resistance to avoid disturbing the circuit it measures • Recall that an ammeter is designed to have very low overall resistance • Confirm whether the question is asking about a series resistor (multiplier) or a shunt resistor (bypass) before choosing.