Electromotive force and Voltage (emf Vs. potential difference) #4 скачать в хорошем качестве

Electromotive force and Voltage (emf Vs. potential difference) #4

Electromotive force or emf of a battery causes the potential difference across the battery terminals. This potential difference called the voltage or terminal voltage is what generates the current. The unit of emf or the electromotive fore are volt or joules per coulomb. The difference between electromotive force and voltage is that emf is generated by the chemical energy in the battery. This helps move positive charge from the negative terminal of a battery to the positive terminal. The gain in potential difference is what helps the charge to move in the circuit from the positive terminal to the negative terminal. Most sources of emf have internal resistance that reduces the potential difference between the terminals. This happens because potential is lost to this resistance as the charge moves across this internal resistance. 00:12 Can a capacitor generate electric current? 00:38 What is an emf device? 01:00 How does a battery work? 01:23 The ski resort analogy 02:10 What happens inside a battery? 03:57 Derivation of emf equation 06:00 What are units of emf? 08:55 What is internal resistance of a battery 09:06 What is terminal voltage? 10:20 Summary of the lesson _ electromotiveforce #emf #voltage​