What type of energy is used when a fan is working​

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

Avoltaic cell converts chemical energy to

The amount of potential energy possessed by an elevated object is equal to what?