Okay kiddo, let's talk about power, root-power, and field quantities!
Firstly, power is a measure of how much energy is being used or transferred over time. It's like how fast a car is going tells you how much distance it can cover in a certain amount of time. Power is measured in watts (just like how speed is measured in miles per hour).
Root-power is a bit trickier, but all it means is finding the "root" (or the inverse) of a power. Remember when we talked about powers being measured in watts? Well, when we find the root-power we're negating that power. So instead of talking about how much energy is being used or transferred over time, we're talking about how much time it takes to use or transfer a certain amount of energy.
Lastly, field quantities are measurements of things that spread out across a space. This could be the strength of a magnetic field, the temperature across a room, or the electric charge in the air. Field quantities are measured in units that describe how much of that influence are in a certain space, like volts per meter or degrees Celsius.
So there you have it, power is a measure of how much energy is being used or transferred over time, root-power is the inverse of that measurement, and field quantities are measurements of things that spread out across a space!