He draws symbols for conductor, capacitor, switch,
positions resistors, inductors, diodes
and understands why charges
can neither be created nor destroyed.
He can explain how generators
convert mechanical energy into electrical
while motors convert electrical into mechanical,
and that the amount of current is dependent on the angle
between the wire’s velocity and the magnetic field,
and sometimes fuses don’t get it right.
Yet I forget that the Pythagorean theorem, quadratic equation,
laws of cosines, and Avogadro’s number confound him
when I see him working all month long
to build a green circuit board the size of a dining table.
Algebra’s needed, power is work over time,
measurements are uncertain, and not all zeros are significant.
Physics is the study of energy and matter
and their intricate pledge to one another.