The total charge a household battery can supply is given in units of mA⋅h. For example, a 9.0 V alkaline battery is rated 450 mA⋅h, meaning that such a battery could supply a 1 mA current for 450 h, a 2 mA current for 225 h, etc.

How much energy, in joules, is this battery capable of supplying?

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )