What is the power usage of device that uses 3.0A of current at a voltage of 120 V? How much energy ( in kilowatt-hours) does this device use if it is left on for 2.0hr?

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.