I measured a simple 100-watt light bulb and the reading indicated by the Watt-Minder was different than 100 watts. Why is this?
The measuring electronics of the Watt-Minder assume a constant voltage of 118 volts. If your voltage varies from this, the readings from the Watt-Minder will be different. If you are unable to verify your line voltage, contact your local utility provider to confirm the actual line voltage of your electric service. This should resolve the discrepancy in the readings from the Watt-Minder.
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