Cost of standby power · PhysicsBowl 2019 #9

Physics · electromagnetism

Problem

Standby power (sometimes called vampire power) is the power used by a device that is off but plugged in and in a standby mode. Regulations typically limit this power to 1 Watt. If electricity costs $0.10 per kilowatt hour, then to the nearest order of magnitude, and assuming 1 Watt, how much does it cost to leave a device in standby mode for one year? (A) 0.01(B)0.01 (B) 0.10 (C) 1.00(D)1.00 (D) 10.00 (E) $100.00

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