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Cost = watts × hours / 1000 × price per kWh. US average electricity rate is about $0.13/kWh but varies from $0.09 (Louisiana) to $0.30+ (Hawaii). A 60W bulb running 8 hours/day costs about $1.87/month. Standby power (phantom load) for electronics adds 5–10% to typical household bills. Smart plugs with energy monitoring give exact readings.
e.g. LED bulb ~10W, TV ~100W, AC ~1500W