Induced Voltage and Inductance
... • When the current flows in the primary coil a magnetic field is produced. This in turn causes a temporary current to flow in the secondary coil. The ammeter reads only for a brief time and then returns to zero. • When the switch is opened the ammeter reads a current in the opposite direction for a ...
... • When the current flows in the primary coil a magnetic field is produced. This in turn causes a temporary current to flow in the secondary coil. The ammeter reads only for a brief time and then returns to zero. • When the switch is opened the ammeter reads a current in the opposite direction for a ...
Magnetic flux and Faraday`s Law
... Öinduce emf because of motion Lenz’s Law: A decrease in the surface causes a decrease in magnetic flux. Therefore the magnetic field from the induced current has to strengthen the field. The current flows counterclockwise. ÖCurrent through rod causes a force against gravity. If Fmag = Fg then rod ...
... Öinduce emf because of motion Lenz’s Law: A decrease in the surface causes a decrease in magnetic flux. Therefore the magnetic field from the induced current has to strengthen the field. The current flows counterclockwise. ÖCurrent through rod causes a force against gravity. If Fmag = Fg then rod ...
AC Machines AC Machines
... nominal voltae and frequency, but without any load on motor. Maximum Starting Current (Ik): It is the maximum current on nominal voltage and frequency when starting a motor. Starting Torque (MA): It is the torque generated by the motor during starting under nominal voltage and frequency. Nominal Mom ...
... nominal voltae and frequency, but without any load on motor. Maximum Starting Current (Ik): It is the maximum current on nominal voltage and frequency when starting a motor. Starting Torque (MA): It is the torque generated by the motor during starting under nominal voltage and frequency. Nominal Mom ...
printer-friendly version
... When two objects possessing an electric charge are brought near each other, an electrostatic force is created between them. An electrostatic force is the resultant of an electrostatic field which surrounds any object that is charged. Thus, the electric field strength at any given distance from an ob ...
... When two objects possessing an electric charge are brought near each other, an electrostatic force is created between them. An electrostatic force is the resultant of an electrostatic field which surrounds any object that is charged. Thus, the electric field strength at any given distance from an ob ...
Lec10drs
... So far, we have discussed the electric potential energy of a point charge in a fixed electric field. Now we introduce the concept of the electric potential energy of a system of point charges. In the case of a fixed electric field, the point charge itself did not affect the electric field that ...
... So far, we have discussed the electric potential energy of a point charge in a fixed electric field. Now we introduce the concept of the electric potential energy of a system of point charges. In the case of a fixed electric field, the point charge itself did not affect the electric field that ...
up11_educue_ch29
... solenoid. The field is directed into the plane of the drawing, and is increasing. What is the direction of the electric force on a positive point charge placed at point a, point b, or point c (the center of the solenoid)? 1. a: to the left; b: straight up; c: down and to the left 2. a: to the right; ...
... solenoid. The field is directed into the plane of the drawing, and is increasing. What is the direction of the electric force on a positive point charge placed at point a, point b, or point c (the center of the solenoid)? 1. a: to the left; b: straight up; c: down and to the left 2. a: to the right; ...
History of electromagnetic theory
For a chronological guide to this subject, see Timeline of electromagnetic theory.The history of electromagnetic theory begins with ancient measures to deal with atmospheric electricity, in particular lightning. People then had little understanding of electricity, and were unable to scientifically explain the phenomena. In the 19th century there was a unification of the history of electric theory with the history of magnetic theory. It became clear that electricity should be treated jointly with magnetism, because wherever electricity is in motion, magnetism is also present. Magnetism was not fully explained until the idea of magnetic induction was developed. Electricity was not fully explained until the idea of electric charge was developed.