An instrument is rated at 250 W if it is connected across a 120-V dc power supply
(a) What current does it draw under normal operation?
(b) What is its resistance?
(c) How many kilowatt-hours does it use in a day if it is left on all the time?
(a) 2.1 A (b) 58 Ω (c) 6.0 kWh
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