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1. The rate at which electric energy is dissipated or consumed in an electric circuit is called electric power. It's SI unit is Watt (W). power = work done / time taken. we know that work done by current I when it flows for time T under potential difference V is given by : W = V*I*T joules.
2. A quantitative form of Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R. The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms.
3. a bad electrical connection that causes a machine to stop working.
4. It occurs when many electrical appliances of high power rating such as a geyser, a heater , an oven, a motor, etc. are switched on simultaneously . This causes fire. Overloading can be avoided by not connecting many electrical appliances of high power rating in the same circuit.
5. Fleming's left-hand rule states that “When a current-carrying conductor is placed in an external magnetic field, the conductor experiences a force perpendicular to both the field and to the direction of the current flow.” It was invented by John Ambrose Fleming.
6. An electric motor is a device which converts electrical energy into mechanical energy. Electric motors and their functions: A power supply – In general, a simple motor has a DC power source. It provides power for the armature of the motor or field coils.
7. On 29 August 1831 Michael Faraday discovered the induction of one current by another in his famous induction ring experiment familiar to every student of physics.
8. Fleming's right-hand rule shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field. It can be used to determine the direction of current in a generator's windings.
9. Definition: The AC generator is a machine that converts mechanical energy into electrical energy in the form of alternative emf. A simple AC generator works on the principle of Faraday's Law of Electromagnetic Induction. It has a coil of wire that rotates in a magnetic field.
10. An electric motor is a machine that converts electrical energy to mechanical energy. An electric generator is a machine that converts mechanical energy to electrical energy. ... The shaft of an electric motor is driven by a magnetic force which is developed between the armature and field.
11. When electricity (conventional current) flows in a long straight wire it creates a circular or cylindrical magnetic field around the wire according to the right-hand rule. ... If the fingers of the right hand are curled in the direction of the circular component of the current, the right thumb points to the north pole.
12. a cylindrical coil of wire acting as a magnet when carrying electric current.
13. A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. ... The energy density of the magnetic field depends on the strength of the field, squared, and also upon the magnetic permeability of the material it fills.