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Devices which are used to introduce addi- tional resistance are called resistors.

As the negatively charged rod is brought near the uncharged bar, electrons in that portion of the bar nearest the rod would be repelled toward the side opposite the rod.

If the current through the conductor is reversed, the compass needle will point in the opposite direction, indicating that the direction of the magnetic field has reversed. In addition, there is a wide variety of equipment which uses cells or batteries either as normal or emergency power.

Therefore, the compass needle always will be positioned at right angles to the current- carrying conductor. If you are changing from a large unit to a small unit, the avn point is moved to the right, while to change from a small unit to a large unit, the decimal point is moved to the left.

If a length of wire carrying a current is bent to form a loop, the lines of force around the conductor all leave at one side of the loop and enter at the other side.

Review of DC Systems and Controls Iron filings are sprinkled on the lucite and current is passed through the coil. If the material is copper the glue is very weak and the free electrons will not be held strongly.

Basic Electricity, vol. 2 by Van Valkenburgh, Nooger & Neville Inc.

With this kind of connec- tion the resistance between the baic terminals is always the same, and the variable arm provides a contact which can be moved to any position be- tween the end terminals. The other outside layer is a film of translucent or semitransparent material which permits light to pass through.


The electric fields of basix electrons push against the electrons in the atoms of the wire, and some of these outer electrons are pushed out of their atoms.

The moment the wire is connected across the cell there will be an excess of electrons at the negative end and a shortage at the positive end. When two unequal charges exist, the electromotive force between the charges is equal to the difference in potential of the two charges. A generator acts in the same manner, with the action of a wire moving through a magnetic field maintaining a constant charge on each of the generator terminals.

Then changing microamperes to amperes is a change from small to large units and the valkenbutgh point should be moved to the left. Lists with This Book. However, when the two magnets are brought together with similar poles opposing, it is difficult to force the magnets together, indi- cating that like poles repel each other. The further you try to turn the bar magnet away from this position, the greater force you will feel. Proper range is selected by starting with the highest range and working downward, until the needle reads about midscale.

Cur- rent in the coil causes the coil to turn. Want to Read Currently Reading Read. If you move the wire past a stationary magnet, you again will notice a deflection of the meter.

Basic Electricity, vol. 2

In order to deflect dlectricity needle, move- ment of the magnet past the wire is necessary. The iron filings are removed from the lucite, and the compass needle is placed on the lucite about 2 inches away from the conductor.

All electrical effects make use of the “free” electrons forced out of the outer orbits. Remem- ber that the lines of force inside a magnet or coil flow from the south bh to the north pole. For measuring currents of less than one ampere some other unit is needed.


If no decimal point is given with the number, it is always understood to follow the last number in the quantity. The badic of the gen- erated magnetic field is found by using the left-hand rule for a current- carrying conductor.

There are only about different kinds of atoms and these are known as elements: As soon as you connect this across a dry cell, a certain amount of current will flow. Some materials which easily build up static electricity are glass, amber, hard rubber, waxes, flannel, silk, rayon and nylon. In some cases, the diaphragm moves a coil of wire past a magnet, generating electrical energy which is transmitted through wires to a receiver.

In order to cause continuous current flow, electric charges must be main- tained so that the difference of potential remains the same at all times. The shunts may be inside the meter movement and electricigy trolled by a switching arrangement or they may be external, in which case they are connected in parallel with the meter bind- ing posts. The illustration shows conductors carrying cur- rent in different directions.

East Dane Elecyricity Men’s Fashion. It is easy to see that the more iron you put in the path of an electric current, the less will be the current flow. A greater Current produces a stronger field, resulting in greater forces of attraction and repulsion between the coil sides and the magnet’s poles. Most storage batteries consist of three lead-acid cells in a common case permanently connected in series.

Units of Resistance Frequency of Alternator Output The ampere -turn is the unit used in comparing the strength of magnetic fields.