Electricity and Magnetism What is magnetism?
... current to flow in a circuit. It is measured in VOLTS (V). • Current is the movement of electrical charge - the flow of electrons through the electronic circuit. Current is measured in AMPERES (AMPS, A). • Resistance is anything that causes an opposition to the flow of electricity in a circuit. It i ...
... current to flow in a circuit. It is measured in VOLTS (V). • Current is the movement of electrical charge - the flow of electrons through the electronic circuit. Current is measured in AMPERES (AMPS, A). • Resistance is anything that causes an opposition to the flow of electricity in a circuit. It i ...
PHYSICS (Theory)
... of two primary cells. Write the formula used. How can the sensitivity of a potentiometer be increased ? 16. Explain, with the help of diagram, the principle and working of an a.c. generator. Write the expression for the e.m.f. generated in the coil in terms of its speed of rotation. 3 17. Give reaso ...
... of two primary cells. Write the formula used. How can the sensitivity of a potentiometer be increased ? 16. Explain, with the help of diagram, the principle and working of an a.c. generator. Write the expression for the e.m.f. generated in the coil in terms of its speed of rotation. 3 17. Give reaso ...
L11_Inductance
... (2) A capacitor can store charge, but an inductor stores magnetic field. (3) An inductor opposes rapid changes of the current passing through it. Inductors can be made out of loops, solenoids, toroids, or any other shape that creates a magnetic field threading its own loops. The inductance of any su ...
... (2) A capacitor can store charge, but an inductor stores magnetic field. (3) An inductor opposes rapid changes of the current passing through it. Inductors can be made out of loops, solenoids, toroids, or any other shape that creates a magnetic field threading its own loops. The inductance of any su ...
1- A resistor is a device. It adds resistance to a circuit . BY
... An electric motor is a machine for CONVERTING (CONVERT) electrical energy INTO mechanical energy. Motors can be designed to run ON direct (DC) or ALTERNATING (AC) current. The most important parts of DC motors are the rotor, the stator and the brush. The rotor is the moving part. It contains an arma ...
... An electric motor is a machine for CONVERTING (CONVERT) electrical energy INTO mechanical energy. Motors can be designed to run ON direct (DC) or ALTERNATING (AC) current. The most important parts of DC motors are the rotor, the stator and the brush. The rotor is the moving part. It contains an arma ...
Direct Current (DC) Circuits 1
... You will determine the internal resistance of the galvanometer Rm from the intercept of R versus x (1/I), but how accurate is it? This procedure will determine Rm more directly. Step 1 – Adjust the external resistor R1 until the current through the galvanometer is 4 mA. ...
... You will determine the internal resistance of the galvanometer Rm from the intercept of R versus x (1/I), but how accurate is it? This procedure will determine Rm more directly. Step 1 – Adjust the external resistor R1 until the current through the galvanometer is 4 mA. ...
III. Transverse and Radial Magnetic Field
... 10 kA, the arc burns in diffuse mode, so that the contacts erosion and heating is acceptable. But currents up to 10 kA represent a range for which other interrupters, much cheaper, can be utilized with success. That’s why, larger currents, up to 100kA, represent the goal for the vacuum interrupters’ ...
... 10 kA, the arc burns in diffuse mode, so that the contacts erosion and heating is acceptable. But currents up to 10 kA represent a range for which other interrupters, much cheaper, can be utilized with success. That’s why, larger currents, up to 100kA, represent the goal for the vacuum interrupters’ ...
12: Electromagnetic Induction
... change in flux so EMF is zero for an instant. - As magnet exits, Lenz’s law tells us that the current must flow in the opposite direction so as to oppose motion. reversed EMF - Max induced EMF occurs on exit because magnet is moving fastest. - t2 is smaller due to greater speed. ...
... change in flux so EMF is zero for an instant. - As magnet exits, Lenz’s law tells us that the current must flow in the opposite direction so as to oppose motion. reversed EMF - Max induced EMF occurs on exit because magnet is moving fastest. - t2 is smaller due to greater speed. ...
An Introduction to Electrical Technology
... opposite way. It switches diretion over and over again continuously. In the united states the AC current in power lines goes switches direction, forward to backward, then backward to forward, 60 times each second. This is a frequency of 60 Hertz and is called 60Hz AC electricity. ...
... opposite way. It switches diretion over and over again continuously. In the united states the AC current in power lines goes switches direction, forward to backward, then backward to forward, 60 times each second. This is a frequency of 60 Hertz and is called 60Hz AC electricity. ...
E290-32-20/8
... e used to realise a simple, energy saving and efficient lighting control system. These devic es are mainly used in private houses, factory premises and commercial and public building s as well as in industrial plants. As a rule, latching relays controlled by means of impulse bu ttons are installed w ...
... e used to realise a simple, energy saving and efficient lighting control system. These devic es are mainly used in private houses, factory premises and commercial and public building s as well as in industrial plants. As a rule, latching relays controlled by means of impulse bu ttons are installed w ...
Class 01 Summary
... So far in this class magnetic fields and electric fields have been fairly well isolated. Electric fields are generated by static charges, magnetic fields by moving charges (currents). In each of these cases the fields have been static – we have had constant charges or currents making constant electr ...
... So far in this class magnetic fields and electric fields have been fairly well isolated. Electric fields are generated by static charges, magnetic fields by moving charges (currents). In each of these cases the fields have been static – we have had constant charges or currents making constant electr ...
Galvanometer
A galvanometer is a type of sensitive ammeter: an instrument for detecting electric current. It is an analog electromechanical actuator that produces a rotary deflection of some type of pointer in response to electric current through its coil in a magnetic field.Galvanometers were the first instruments used to detect and measure electric currents. Sensitive galvanometers were used to detect signals from long submarine cables, and to discover the electrical activity of the heart and brain. Some galvanometers use a solid pointer on a scale to show measurements; other very sensitive types use a miniature mirror and a beam of light to provide mechanical amplification of low-level signals. Initially a laboratory instrument relying on the Earth's own magnetic field to provide restoring force for the pointer, galvanometers were developed into compact, rugged, sensitive portable instruments essential to the development of electrotechnology. A type of galvanometer that records measurements permanently is the chart recorder. The term has expanded to include use of the same mechanism in recording, positioning, and servomechanism equipment.