Overview
The lecture explains how to calculate electrical charge flow in a circuit using the relationship between current, time, and charge.
Electric Current and Charge Flow
- Electric current is the rate at which electrical charge flows through a circuit.
- Electrical charge is measured in coulombs (symbol: C).
- A current of 1 ampere (A) means 1 coulomb of charge passes a point in the circuit per second.
Charge Flow Equation
- The equation: Charge flow (Q, in coulombs) = Current (I, in amperes) × Time (t, in seconds).
- This equation is not provided in exams and must be memorized.
Example Calculations
- To find charge: Multiply current by time (e.g., Q = 0.3 A × 20 s = 6 C).
- To find current: Rearrange to Current = Charge flow ÷ Time (e.g., I = 360 C ÷ 400 s = 0.9 A).
Key Terms & Definitions
- Electric current — the rate of flow of electrical charge.
- Coulomb (C) — the unit of electrical charge.
- Ampere (A) — the unit of electric current; 1 A = 1 C per second.
Action Items / Next Steps
- Memorize the charge flow equation: Q = I × t.
- Practice more charge flow calculation questions from the vision workbook.