PHYS_2326_022609
... In electrostatic situations – no E-field inside There is no net current. But charges (electrons) still move chaotically, they are not on rest. On the other side, electrons do not move with ...
... In electrostatic situations – no E-field inside There is no net current. But charges (electrons) still move chaotically, they are not on rest. On the other side, electrons do not move with ...
PHYS 1112 In-Class Exam #3B Thu. April 9, 2009, 2:00pm-3:15pm
... This is a closed-book, closed-notes exam. The last exam pages are sheets of formulae and numerical data for you to consult. The exam consists of 12 multiple-choice questions. Each question is worth one raw score point. There will be no penalty for wrong answers. No partial credit will be given. I re ...
... This is a closed-book, closed-notes exam. The last exam pages are sheets of formulae and numerical data for you to consult. The exam consists of 12 multiple-choice questions. Each question is worth one raw score point. There will be no penalty for wrong answers. No partial credit will be given. I re ...
How transformers work
... 1. A transformer a primary current of 30A. If the secondary voltage is 10v and the secondary current is 2.4A, what will the primary voltage be? 2. A transformer has a secondary voltage of 15v and a secondary current of 4A. If the primary voltage is 2v, what will the primary current be? 3. A transfor ...
... 1. A transformer a primary current of 30A. If the secondary voltage is 10v and the secondary current is 2.4A, what will the primary voltage be? 2. A transformer has a secondary voltage of 15v and a secondary current of 4A. If the primary voltage is 2v, what will the primary current be? 3. A transfor ...
1. What happens when electrical charges are brought together? A
... Title IX of the Education Amendments of 1972, the Department of Public Instruction does not discriminate on the basis of race, sex, religion, color, national or ethnic origin, age, disability, or military service in its policies, programs, activities, admissions or employment. ...
... Title IX of the Education Amendments of 1972, the Department of Public Instruction does not discriminate on the basis of race, sex, religion, color, national or ethnic origin, age, disability, or military service in its policies, programs, activities, admissions or employment. ...
Electromagnetic Induction
... (Q.19) A closed loop of wire is being moved so that it remains in a uniform magnetic field. What is the ...
... (Q.19) A closed loop of wire is being moved so that it remains in a uniform magnetic field. What is the ...
Slide 1
... The counter emf is “like” friction that opposes the original change of current. Motors have many coils of wire, and thus generate a large counter emf when they are running. Good—keeps the motor from “running away.” Bad—”robs” you of energy. ...
... The counter emf is “like” friction that opposes the original change of current. Motors have many coils of wire, and thus generate a large counter emf when they are running. Good—keeps the motor from “running away.” Bad—”robs” you of energy. ...
What are the different forms of energy?
... passing through a prism is called a __________. An __________ is a “picture” of the light source that light makes bouncing off a shiny ...
... passing through a prism is called a __________. An __________ is a “picture” of the light source that light makes bouncing off a shiny ...
RMS values - WordPress.com
... The maximum or peak value cannot be the total useful current, power or voltage, as so much of the wave is less than the maximum. This is the average value. This cannot be done over both positive and negative half cycles, as this would produce an average value of zero. So to look at the average valu ...
... The maximum or peak value cannot be the total useful current, power or voltage, as so much of the wave is less than the maximum. This is the average value. This cannot be done over both positive and negative half cycles, as this would produce an average value of zero. So to look at the average valu ...
Magnetism and induction
... That magnetic flux is induced by electric fields that are antiparallel to each other. That induced electromotive force (emf) gives rise to a current whose magnetic field is in the same direction as the change in magnetic flux. That induced electromotive force (emf) reduces the electric field a ...
... That magnetic flux is induced by electric fields that are antiparallel to each other. That induced electromotive force (emf) gives rise to a current whose magnetic field is in the same direction as the change in magnetic flux. That induced electromotive force (emf) reduces the electric field a ...
PHYS 1112 In-Class Exam #3A Thu. April 9, 2009, 11:00am-12:15pm
... This is a closed-book, closed-notes exam. The last exam pages are sheets of formulae and numerical data for you to consult. The exam consists of 12 multiple-choice questions. Each question is worth one raw score point. There will be no penalty for wrong answers. No partial credit will be given. I re ...
... This is a closed-book, closed-notes exam. The last exam pages are sheets of formulae and numerical data for you to consult. The exam consists of 12 multiple-choice questions. Each question is worth one raw score point. There will be no penalty for wrong answers. No partial credit will be given. I re ...
Example 17 Use current division to determine the current i through
... In this problem, we are trying to find the current i through the 7 kΩ resistor using current division. Let’s consider this circuit, the source current 10 mA is divided into two branch currents i1 and i 2 . And then i 2 is divided by the two parallel branches. If we can find i 2 , we might use curren ...
... In this problem, we are trying to find the current i through the 7 kΩ resistor using current division. Let’s consider this circuit, the source current 10 mA is divided into two branch currents i1 and i 2 . And then i 2 is divided by the two parallel branches. If we can find i 2 , we might use curren ...
12: Electromagnetic Induction
... The direction of an induced current is always such as to oppose the change that causes it. In the previous example, if the currents were induced in the opposite direction the magnet would be repelled – free energy! Impossible. So Lenz’s Law is an application of the principle of conservation of energ ...
... The direction of an induced current is always such as to oppose the change that causes it. In the previous example, if the currents were induced in the opposite direction the magnet would be repelled – free energy! Impossible. So Lenz’s Law is an application of the principle of conservation of energ ...
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.