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It’s no surprise that many hardware hackers avoid working with AC, and frankly, we can’t blame them. The potential consequences of making a mistake when working with mains voltages are far greater ...

The folks at TOG, Dublin Hackerspace, have a large variac. A variac is a useful device for testing some fault conditions with AC mains powered equipment, it allows an operator to dial in any AC output ...

As the voltage is increased, the current increases which results in an increase in temperature of the filament. The increase in temperature affects the range of wavelengths emitted by the light bulb.