Show Up Both Semesters!

This mural is funny because the student has mixed 1st (Mechanics) and 2nd (Electricity and Magnetism) semester topics incorrectly!

1st semester, I is rotational inertia instead of current, which can be calculated from the small bit of mass (dm) found at a radius r from the axis of rotation. Instead, the student should have used I=V/R from 2nd semester.

1st semester, v is velocity and can be found using kinematic equations such as Vf=Vo+at. Instead, the student should realize that an inductor acts like an open switch at t=0, making the current and potential 0.

1st semester, L is angular momentum, which can be found by multiplying rotational inertia I and angular velocity w (lambda, which is not watts!) Instead, the student should have used a relationship between the energy stored on the inductor, L, and the current through the inductor, or between the voltage, L, and the change in current over time.

1st semester, power is force dot velocity, but p can also mean momentum, which is mass times velocity. Instead, the student should have used power= current times voltage or = current ^2 times resistance or = voltage ^2 divided by resistance, the three equivalent equations for power in circuits. Voltmeters are not units, they are devices used to measure the voltage drop over part of a circuit.