This deep dive covers Understanding Current and Charge within Current & Charge for GCSE Physics. Revise Current & Charge in Electricity for GCSE Physics with 19 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 13 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 13
Practice
19 questions
Recall
30 flashcards
📚 Understanding Current and Charge
Charge Equation
Q = I × t
Charge (Coulombs) = Current (Amps) × time (seconds)
Current is the rate of flow of charge — how much charge passes a point per second.
- 1 Ampere (A) = 1 Coulomb of charge flowing per second
- If 2 A flows for 10 s: Q = 2 × 10 = 20 Coulombs passed
What actually flows in a metal wire:
- In metal wires: electrons (negative charges)
- Electrons flow from negative to positive terminal
- Conventional current is defined as positive to negative (historical convention — defined before electrons were discovered)