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: Electrical power output from the alternators.
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