JERRY MASON / SCIENCE PHOTO LIBRARY JERRY MASON / SCIENCE PHOTO LIBRARY
Bar heater filaments. Two bars of an electric fire glow orange, casting reflections on a mirrored surface behind them. An electric fire works by passing an electric current through a wire filament which is wrapped around a bar. As the current flows it causes the filament to heat up. Electric fires often have a reflective surface placed behind the bars to direct the heat radiation in one direction.
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