EMF, Potential difference, Electrical power, Types of supply
Electromotive force:- Causes an electric current to flow in an electric circuit. Potential difference:- Difference between electrical potential of two points which tends to cause flow of electrons between them. Electrical potential of a point can be measured by the amount of work done in bringing a unit positive charge form infinity to that point. Unit : volt (V). Electrical power:- Work done by the electrical instruments per a unit time. P= W/t Unit: Watt Types of electrical power supply:- 1 . DC Supply: Polarity of the current/voltage/power of a source remains same with respect to time. Example: Current available from batteries and solar cell is of DC Current. 2. AC Supply: Magnitude and polarity of the current/voltage/power of a source changes periodically with respect to time. Example: Electri