Which action reduces heating when taking current readings?

• A. Limit current so that temperature doesn't increase
• B. Switch off between readings
• C. Use a higher voltage supply
• D. Ignore temperature effects

Answer: (A)

When you measure current, the circuit can warm up because electrical power is turned into heat in the conductors and components. This heating can change resistance and therefore affect the reading. The heat produced is proportional to I^2R, so keeping the current small reduces the heat and keeps the temperature closer to ambient. That stability helps the resistance stay steadier and the measurement more accurate. Using a higher voltage would push more current and generate more heat, making things worse. Switching off between readings might cut heat during pauses, but heat still occurs while you’re on, and the overall temperature rise is not as reliably controlled as simply limiting the current. So the best way to reduce heating during current readings is to limit the current.