Electric charge   

Coulomb's Law

Power vs energy

Cost of running appliances

Example: Estimate the cost of running a TV all night.
Solution: A TV consumes about 250 watts (estimates can vary). In the course of an 8-hour night, the TV would consume about 0.250 kW* 8 h = 2 kWh. Since 1 kWh costs about $0.10, 2 kWh should cost about $0.20.


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