Any students taking Physics at O level will be able to tell you that there are two types of currents – a.c and d.c. But do they know why? Could we have just used d.c or a.c alone? Click here for a brief recount of what happened.
Secondary 1/2 Level What you need to know for this topic: Recognise the importance of food in providing us with nutrients such as carbohydrates, proteins and fats. Describe the roles of the different nutrients in cellular processes such as respiration, growth and tissue repair. Explain the importance of the digestive system in breaking down large, … Read more