GCSE Physics (9-1) - GCSE Physics - Alternating Current & Direct Current | AC & DC (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. Alternating Current (AC) * The direction of current is constantly swapping back and forth. * It is produced by an alternating potential difference. * AC is represented by a sine wave on a voltage-time graph. 2. UK Mains Supply as an Example of AC * The UK mains supply uses alternating current. * It has a frequency of 50 Hz. * The potential difference fluctuates between approximately +230/240 V and -230/240 V. 3. Direct Current (DC) * The current always flows in the same direction. * It is produced by a direct potential difference (which is constantly positive or negative). * DC is represented by a straight horizontal line on a voltage-time graph. * Examples of DC sources include cells and batteries. 4. Oscilloscopes * These devices are used to display potential difference against time graphs for AC and DC. *** CHAPTERS *** 0:00 Introduction to Alternating and Direct Current 0:19 What is Alternating Current (AC)? 0:58 UK Mains Supply Explained 1:45 What is Direct Current (DC)? 2:08 Using Oscilloscopes to Measure Current *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7VzYfPIVt8T09xOLNcolCe4&si=8JmDajxjtba6rdc3 https://youtube.com/playlist?list=PLidqqIGKox7UZ3mWhbHv2aA_1vnbsfRPq&si=q3hEKdA4v7kbfwMe https://www.youtube.com/playlist?list=PLidqqIGKox7UTimdJ3eFcnt6xL9GUt2a6 https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #GCSE #Physics #study #revision #school #exam #AQA #OCR #Edexcel