🔍 Key Concepts

• Series vs. parallel connections in DC circuits • How an ammeter is supposed to interact with circuit current • The effect of meter internal resistance on circuit operation

💭 Think About

• Ask yourself: Does an ammeter need the circuit’s current to flow through it, or just a small sample of the circuit’s voltage across it? • Think about what would happen to the rest of the circuit if the meter had very low resistance and you connected it across (around) a load. • Consider how you normally have to break or not break a circuit when inserting an ammeter versus a voltmeter.

✅ Before You Answer

• Verify which type of device is intended to measure current versus measure voltage. • Check whether the chosen connection method would cause most of the current to bypass the load or flow through the meter. • Confirm that the option you pick is consistent with the rule that ammeters are designed to have very low internal resistance.