Circuit symbols and diagrams

Repair the common break

Common misconception: An ammeter and voltmeter can exchange positions without changing a circuit.

Correct model: Use conventional symbols and connect an ammeter in series and a voltmeter in parallel with the measured component.

Worked transfer

To measure a lamp’s current and p.d., place the ammeter in the lamp branch and the voltmeter across the lamp. Swapping them changes the circuit because their ideal resistances differ greatly.

Guided practice

Explain why “An ammeter and voltmeter can exchange positions without changing a circuit.” fails. Then construct one example that correctly applies circuit symbols and diagrams.

Independent practice

Describe a circuit for measuring the I–V characteristic of a diode, including meter positions and a control for current.

Return to the recorded repair plan when the explanation and application are secure enough to re-test.