Precautions for circuit readings of I and V so that readings are accurate?

• A. Switch off between readings.
• B. Limit current so that temp. doesn't increase
• C. Use a tapping meter
• D. Keep the circuit connected between readings

Answer: (A)

Switching the power off between readings keeps the circuit in a known, stable state for each measurement. When a circuit is energized, components like resistors can heat up as current flows; resistance can change with temperature, so subsequent readings of current and voltage may drift and become inaccurate. Turning the power off between measurements also prevents any meter burden voltage or transient effects from influencing the values. In short, this approach reset the circuit to its baseline conditions so each reading reflects the same setup. Keeping the circuit connected between readings or trying to limit current without powering down can still allow drift and inconsistencies, and a tapping meter isn’t necessary for basic I–V readings in a simple circuit.