🔍 Key Concepts
• Electrical resistance in basic circuit theory
• Ohm’s Law: relationship between voltage, current, and resistance
• How power dissipation relates to resistance (P = I²R or P = V²/R)
💭 Think About
• Think about the formal definition of resistance in terms of how it relates voltage and current—what role does it play in Ohm’s Law?
• Consider whether resistance is directly defined by its unit of measurement, or if the unit is just one characteristic of it.
• Ask yourself: does resistance both determine how much power is lost as heat in a component and also serve as the proportionality factor between voltage and current?
✅ Before You Answer
• Verify how Ohm’s Law is written and what quantity sits between voltage and current.
• Confirm the unit used to measure resistance and whether that alone is a complete definition.
• Check how power loss in a resistor depends on resistance using formulas like P = I²R or P = V²/R and see which statements accurately describe resistance.