1. If a wire of uniform area of cross section is cut into two halves
... point of higher to point at lower potential. b) Negative charges move in conductors from points at higher to points at lower potential. c) Positive charges move in conductors from point of lower to point at higher potential. d) Negative charges move do not move. 44. A hollow charged sphere produces ...
... point of higher to point at lower potential. b) Negative charges move in conductors from points at higher to points at lower potential. c) Positive charges move in conductors from point of lower to point at higher potential. d) Negative charges move do not move. 44. A hollow charged sphere produces ...
UNIT 1 - Past Papers Of Home
... At the beginning of the unit, the phenomenon of permanent magnetism and magnetic materials is dealt with and this is vital for the understanding of the topics and devices in the second half. Pupils will learn about three related magnetic effects. These are the production of a magnetic field by a cur ...
... At the beginning of the unit, the phenomenon of permanent magnetism and magnetic materials is dealt with and this is vital for the understanding of the topics and devices in the second half. Pupils will learn about three related magnetic effects. These are the production of a magnetic field by a cur ...
MAGNETIC EFFECTS OF CURRENT & MAGNETISM (Important formulae & concepts)
... B is given by F = q (v x B ). Which pair of vectors is always right angle to each other? 2. Why does the energy of a moving charge particle in a uniform magnetic field does not change? [Hint : The magnetic force acts perpendicular to the direction of motion, there is no change in the speed so ki ...
... B is given by F = q (v x B ). Which pair of vectors is always right angle to each other? 2. Why does the energy of a moving charge particle in a uniform magnetic field does not change? [Hint : The magnetic force acts perpendicular to the direction of motion, there is no change in the speed so ki ...
2-Way Switch - Flickering Bulb Issue
... The simple solution is to wire the circuit to avoid having the live wire running between the two wires connected to the lamp, and thus avoid induction into a wire loop. To do this, you can simply swap the middle wire with one of the other wires (red and white wires in this case) at both lig ...
... The simple solution is to wire the circuit to avoid having the live wire running between the two wires connected to the lamp, and thus avoid induction into a wire loop. To do this, you can simply swap the middle wire with one of the other wires (red and white wires in this case) at both lig ...
Emf and Internal Resistance
... When current flows, wires/battery etc heat up hence energy is “lost” per coulomb. (So we have some “lost volts” before the charge even reaches the load resistor.) The e.m.f. is the energy supplied per coulomb BEFORE any volts are lost. To measure e.m.f. we must have no current flowing so that there ...
... When current flows, wires/battery etc heat up hence energy is “lost” per coulomb. (So we have some “lost volts” before the charge even reaches the load resistor.) The e.m.f. is the energy supplied per coulomb BEFORE any volts are lost. To measure e.m.f. we must have no current flowing so that there ...
magnetic field - Broadneck High School Physics Web Site
... paper clearly show that like poles repel (a) and unlike poles attract (b). The iron filings do not form continuous lines between like poles. Between a north and a south pole, however, the iron filings show that field lines run directly between the two magnets. ...
... paper clearly show that like poles repel (a) and unlike poles attract (b). The iron filings do not form continuous lines between like poles. Between a north and a south pole, however, the iron filings show that field lines run directly between the two magnets. ...
DEPARTMENT OF CHEMISTRY TEACHING LAB EXPERIMENT
... Note any dangerously incompatible materials and hazards arising from contact of any reagents and substances used with common materials such as paper, benches, hoses, etc. Measures to be taken to reduce the level of risk Include hazards of previously unknown products. Location of work – laboratory, o ...
... Note any dangerously incompatible materials and hazards arising from contact of any reagents and substances used with common materials such as paper, benches, hoses, etc. Measures to be taken to reduce the level of risk Include hazards of previously unknown products. Location of work – laboratory, o ...
Science Fun Night: Magic Magnets
... Building a Simple Electric Motor With a AA battery, disk magnet, steel screw, and wire, we can make a simple electric motor: 1) First stick the disk-shaped magnet to the head of the screw and hang the tip of the screw from the bumpy end (positive terminal) of the battery. Hey ... why doesn't the scr ...
... Building a Simple Electric Motor With a AA battery, disk magnet, steel screw, and wire, we can make a simple electric motor: 1) First stick the disk-shaped magnet to the head of the screw and hang the tip of the screw from the bumpy end (positive terminal) of the battery. Hey ... why doesn't the scr ...
Transmission of Electrical Energy
... steel wires known as ground or shield wires. Cable lines are designed to be placed underground or under the water. In cables, the conductors are insulated from each other and surrounded by a protective sheath. They are more expensive than overhead power lines. Transmission lines are characterized by ...
... steel wires known as ground or shield wires. Cable lines are designed to be placed underground or under the water. In cables, the conductors are insulated from each other and surrounded by a protective sheath. They are more expensive than overhead power lines. Transmission lines are characterized by ...
400A AC/DC Current Clamp-on MultiMeter Adaptor
... 1. Set the DMM range to AC mV when measuring AC amps and DC mV when measuring DC amps or to the lowest voltage range. 2. Connect the RED test lead to the DMM '+' Voltage terminal and the BLACK lead to the '-' COM terminal. 3. Set the adaptor to the 40A (AC or DC) or the 400A (AC or DC) range. 4. Pre ...
... 1. Set the DMM range to AC mV when measuring AC amps and DC mV when measuring DC amps or to the lowest voltage range. 2. Connect the RED test lead to the DMM '+' Voltage terminal and the BLACK lead to the '-' COM terminal. 3. Set the adaptor to the 40A (AC or DC) or the 400A (AC or DC) range. 4. Pre ...
Transmission lines () - Lyle School of Engineering
... • Power really flows via an electromagnetic wave in the space surrounding the wires (only a little electric field in the copper) – Wave speed is affected by the insulation material (e.g.,plastics, paper pulp, silk or other woven fibers, etc.) – Only a surface portion of the copper carries alternatin ...
... • Power really flows via an electromagnetic wave in the space surrounding the wires (only a little electric field in the copper) – Wave speed is affected by the insulation material (e.g.,plastics, paper pulp, silk or other woven fibers, etc.) – Only a surface portion of the copper carries alternatin ...
Electro-magnetic flow meters
... voltage is proportional to the rate of change of flux. Consider also how useful this integration method is in practical inductor design; if you know the number of turns on a winding and the voltage waveform on it then you integrate with regard to time and voilá you have found the amount of flux. Wha ...
... voltage is proportional to the rate of change of flux. Consider also how useful this integration method is in practical inductor design; if you know the number of turns on a winding and the voltage waveform on it then you integrate with regard to time and voilá you have found the amount of flux. Wha ...
01 - Copley-fairlawn.org
... and 500 W. The resistance of each of these light bulbs decreases as the bulb’s power output increases so that the 150-W bulb has a resistance of 96.0 , the 300-W bulb has a resistance of 48.0 , and the 500-W bulb has a resistance of 29.0 . If the voltage across each bulb is 120.0 V, what is the c ...
... and 500 W. The resistance of each of these light bulbs decreases as the bulb’s power output increases so that the 150-W bulb has a resistance of 96.0 , the 300-W bulb has a resistance of 48.0 , and the 500-W bulb has a resistance of 29.0 . If the voltage across each bulb is 120.0 V, what is the c ...
Instantaneous Power Measurement using Hall Sensor
... Fig-1 shows a thin sheet of semi conducting material (Hall element) through which a current is passed. The output connection are perpendicular to the direction of current when no magnetic field is present current distribution is uniform and no potential difference is seen across the output. ...
... Fig-1 shows a thin sheet of semi conducting material (Hall element) through which a current is passed. The output connection are perpendicular to the direction of current when no magnetic field is present current distribution is uniform and no potential difference is seen across the output. ...
Magnetic field around a current
... The stove itself is cool to the touch. The water in the ferromagnetic metal pot is boiling while that in the glass pot is not. How can such a cool stove boil water, and why isn’t the water in the glass pot boiling? ...
... The stove itself is cool to the touch. The water in the ferromagnetic metal pot is boiling while that in the glass pot is not. How can such a cool stove boil water, and why isn’t the water in the glass pot boiling? ...
Class Notes
... magnetic field was no longer aligned with the external magnetic field. If we release the current loop, the external magnetic field will do work on our current loop to realign the fields. Thus, magnetic potential energy was stored in turning the loop to the unaligned position and given up when the lo ...
... magnetic field was no longer aligned with the external magnetic field. If we release the current loop, the external magnetic field will do work on our current loop to realign the fields. Thus, magnetic potential energy was stored in turning the loop to the unaligned position and given up when the lo ...
War of Currents
... transformer. Available power is the product of current × voltage at the load. For a given amount of power, a low voltage requires a higher current and a higher voltage requires a lower current. Since metal conducting wires have an almost fixed electrical resistance, some power will be wasted as heat ...
... transformer. Available power is the product of current × voltage at the load. For a given amount of power, a low voltage requires a higher current and a higher voltage requires a lower current. Since metal conducting wires have an almost fixed electrical resistance, some power will be wasted as heat ...
Environmental Safety - Notes For ANZCA Primary Exam
... • = use of high frequency electric current to produce heat • used to either ‣ cut or destroy tissue ‣ produce coagulation frequency: ...
... • = use of high frequency electric current to produce heat • used to either ‣ cut or destroy tissue ‣ produce coagulation frequency: ...
Proximity Heating Effects in Power Cables
... lighting, electric motors, variable speed drives, transformers and reactors and virtually all other electrical and electronic equipment are examples of non-linear loads which are the norm in the built environment rather than the exception. Such loads produce complex current and voltage waves and sim ...
... lighting, electric motors, variable speed drives, transformers and reactors and virtually all other electrical and electronic equipment are examples of non-linear loads which are the norm in the built environment rather than the exception. Such loads produce complex current and voltage waves and sim ...
the Note
... 1. Batteries and cells are the main source of direct current. These are too expensive to provide large amounts of current. 2. Direct current cannot be transformed. Even when using a DC generator, transformers are less effective than when transforming current from an AC generator. 3. The potential di ...
... 1. Batteries and cells are the main source of direct current. These are too expensive to provide large amounts of current. 2. Direct current cannot be transformed. Even when using a DC generator, transformers are less effective than when transforming current from an AC generator. 3. The potential di ...
Skin effect
Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor. The electric current flows mainly at the ""skin"" of the conductor, between the outer surface and a level called the skin depth. The skin effect causes the effective resistance of the conductor to increase at higher frequencies where the skin depth is smaller, thus reducing the effective cross-section of the conductor. The skin effect is due to opposing eddy currents induced by the changing magnetic field resulting from the alternating current. At 60 Hz in copper, the skin depth is about 8.5 mm. At high frequencies the skin depth becomes much smaller. Increased AC resistance due to the skin effect can be mitigated by using specially woven litz wire. Because the interior of a large conductor carries so little of the current, tubular conductors such as pipe can be used to save weight and cost.