If a device uses 280 watts of power a day, about how many kilowatt-hours will it use in 30 days?

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

You can decrease the resistance of a length of wire by