Lesson Plan

Define electric current and calculate it from charge flow over time using I = ΔQ/Δt

State Ohm's Law and use V = IR to calculate voltage, current, or resistance

Explain what electrical resistance is physically and identify factors that affect it

Distinguish between ohmic and non-ohmic materials

Interpret V-I graphs for ohmic and non-ohmic components

19.1

"In equation form, electric current I is defined as $I = \frac{\Delta Q}{\Delta t}$ where $\Delta Q$ is the amount of charge that flows past a given area and $\Delta t$ is the time it takes for the charge to move past the area. The SI unit for electric current is the ampere (A)" "In the 19th century, the German physicist Georg Simon Ohm (1787–1854) found experimentally that current through a conductor is proportional to the voltage drop across a current-carrying conductor. ... The constant of proportionality is the resistance R of the material, which leads to $V = IR$. This relationship is called Ohm's law."