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Why do smoke alarms keep going off even when there's no smoke?

  • Written by MVS Chandrashekhar, Assistant professor of electrical engineering, University of South Carolina
Why do smoke alarms keep going off even when there's no smoke?Sensors in smoke detectors monitor how particles in the air affect a flow of current to the batteryGarrett Aitken/iStock via Getty Images

Editor’s note: MVS Chandrashekhar is a professor of electrical engineering at the University of South Carolina. In this interview, he explains how smoke detectors work and why they sometimes sound an alarm...

Read more: Why do smoke alarms keep going off even when there's no smoke?

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