If you measure current across a valve coil, what is the likely outcome?

If you measure current across a valve coil, what is the likely outcome?

• A. ruin the heat anticipator
• B. read a precise current
• C. trip the main breaker
• D. improve fuel efficiency

Answer: (A)

Measuring current correctly means placing the meter in series so all current flows through it. If you put a current-measuring device across a valve coil, you essentially short the coil because an ammeter presents a very low resistance. That creates a large unintended current path and can push excess current through the thermostat’s heat anticipator, a small resistor inside the thermostat used to fine‑tune cycling. The extra current can overheat and damage the heat anticipator, which is not meant to carry fault currents. So the likely outcome is damage to the heat anticipator. Reading a precise current wouldn’t happen when you short across the coil, and tripping the main breaker or improving fuel efficiency aren’t typical direct results of this improper measurement.

Measuring current correctly means placing the meter in series so all current flows through it. If you put a current-measuring device across a valve coil, you essentially short the coil because an ammeter presents a very low resistance. That creates a large unintended current path and can push excess current through the thermostat’s heat anticipator, a small resistor inside the thermostat used to fine‑tune cycling. The extra current can overheat and damage the heat anticipator, which is not meant to carry fault currents. So the likely outcome is damage to the heat anticipator. Reading a precise current wouldn’t happen when you short across the coil, and tripping the main breaker or improving fuel efficiency aren’t typical direct results of this improper measurement.