📚 Topic Summary
Electric current is the rate at which electric charge flows past a point or region. It's typically carried by electrons moving through a conductor, like a wire. The amount of current (I) is defined as the amount of charge ($\Delta Q$) passing through a cross-sectional area per unit of time ($\Delta t$). Therefore, $I = \frac{\Delta Q}{\Delta t}$. Ohm's Law relates current to voltage (V) and resistance (R): $V=IR$. Remember that current is conventionally defined as the direction positive charge would flow, even if it's actually electrons moving!
🧠 Part A: Vocabulary
Match the terms to their definitions:
| Term |
Definition |
| 1. Ampere |
a. Opposition to current flow |
| 2. Coulomb |
b. Potential difference |
| 3. Volt |
c. Unit of electric current |
| 4. Resistance |
d. Unit of electric charge |
| 5. Current |
e. Rate of charge flow |
🧲 Part B: Fill in the Blanks
Complete the following paragraph:
According to _____ Law, the _____ across a resistor is directly proportional to the _____ flowing through it, provided the temperature and other physical conditions remain _____. The constant of proportionality is called _____, measured in ohms.
💡 Part C: Critical Thinking
Describe a scenario where Ohm's Law might not accurately predict the behavior of an electric circuit. Explain why Ohm's Law might fail in that situation.