Physics Help Forum Electrical power..numerical..

 Electricity and Magnetism Electricity and Magnetism Physics Help Forum

 Feb 28th 2010, 11:15 PM #1 Junior Member   Join Date: Feb 2010 Location: jharkhand, india Posts: 7 Electrical power..numerical.. A refrigerator is marked 80 W and 220 V. 1. How much energy does it consume in one day if on an average it is used for 20 hrs. a day? 2. What is likely to happen (to the amount of energy consumed) if the voltage drops to 55 V?
 Feb 28th 2010, 11:51 PM #2 Senior Member   Join Date: Dec 2008 Location: Udupi, Karnataka, India Posts: 292 Refrigerator consumes 80 W per second. Power is the rate energy consumption. Energy can be measured as kW hr or units. Now you can find the energy consumed in W hr or kW hr. In the next part, Find the resistance of the refrigerator using the formula W = V^2/R. Then find new power for the new voltage.

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