🔍 Key Concepts
• Ohm’s Law relationship between voltage (E), current (I), and resistance (R) in a simple DC circuit
• How series components like the fuse (FU) and switch (Sw) are treated in an ideal basic circuit problem
• Converting the verbal data (6 amps, 180 ohms) into the correct formula for source voltage
đź’ Think About
• In figure A, when the switch is closed, what kind of circuit do you effectively have: series or parallel, and how does that affect the current through the resistor?
• Using Ohm’s Law, if you know the current and the resistance, which variable are you solving for, and how do you rearrange the formula to isolate that variable?
• Once you calculate the voltage, which answer choice is in the same order of magnitude as your result (very small, small, moderate, or very large)?
âś… Before You Answer
• Be sure you are using Ohm’s Law with the correct units: amps for current and ohms for resistance
• Confirm you rearranged the formula correctly to solve for voltage, not current or resistance
• Double‑check the multiplication step before comparing your result to the answer choices