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The direction in which the fingers go around the conductor is the. The carbon coating is covered with baked enamel, for protection and to conduct heat away from the carbon film so that it does not overheat and burn out. If an object has a static charge, it will in- fluence all other nearby objects. Observe that when the lamp is inserted, its light indicates the current flow is the same as before.

In order that the turning force will increase uniformly as the current in- creases, the horseshoe magnet poles are shaped to form semi-circles. To further increase the flux density, an iron core is inserted in the coil.

Review of Current Flow In this way you can be as- sured that the current is not excessive for the meter range, and you will never have the unfortunate experience of burning out a meter movement, or of wrapping the needle around the stop-peg. An opening in the cover allows water to be added to the electrolyte to replace water which evapo- rates. At the top, the casing would contain layers of sawdust, sand and pitch. Because an ammeter indicates the rate of electron movement just as a meter in a water system shows the rate at which gallons of water are used, it follows that in order to show correctly the amount of current being used, the ammeter must be connected into the line by breaking or opening the line to insert it.

By doubling the length of the electric current path between the terminals of the dry cell, you have put twice as many attractions in the way, and you have doubled the resistance. Corey Burns rated it liked it Feb 20, Precision wound resistors of Manganin wire are used where the resistance value must be very accurate such as in test instruments.


If you bring two materials of opposite charges together, the excess electrons of the negative charge will transfer to the material having a lack of electrons.

Basic Electricity, vol. 2

If the coil itself is not changed in any way, the magnetic strength of the coil will depend on the amount of current flow- ing through the coil. Since the amount by which the coil turns depends upon the amount of coil current, the meter indicates the current flow directly. Mary Baumfalk rated it liked it Nov 21, Microphones used with public address systems and radio transmitters sometimes oper- ate on this principle. A safe method of current measurement is to start with a meter having a range much greater than you expect to measure, in order to determine the correct meter to use.

For most materials the hotter the material, the more resistance it offers to the flow of an electric current; and the colder the material, the less re- sistance it offers to the flow of an electric current.

Basic Electricity

Be the first to review this item Would you like to tell us about a lower price? An atom does not have any glue on it, but the electric fields of the positive charges in the nucleus hold the electric fields of the outer electrons in very much the same manner.

Before working with electricity, you will want to know exactly what an electron is and what causes it to move in a material. The coulomb measures the quantity of electric charge or the number of electrons regardless of whether the charge is in motion or standing still.

Thanks for elwctricity us about the problem. A storage battery of secondary cells can furnish large for a short time and can be recharged. Jason Diederich rated it really liked it Dec 23, You see that, each time the circuit current flows, the filings arrange themselves to show the magnetic field.


The electron theory assumes that all electrical and electronic effects are due to the movement of electrons from place to place or that there are too many or too few electrons in a particular place. If this happens, static charges are built up in the two eelectricity, and friction has thus been a source of electricity.

They help but they also just look real swell! Then the positive terminal of the amp range ammeter is connected with a length of pushback wire to the positive terminal of the battery.

As you pro- ceed further with your work in electricity, you will find yourself using me- ters more and more often. When you close the switch a certain amount of electric current will flow through the wire. Whether they are free to move or not, a force of attraction always exists between unlike charges.


Magnetic lines of force act like stretched rubber bands. Using the left-hand rule you can check the direction of the magnetic field which was indicated by the compass needle.

Using a higher voltage basicc result in a greater current flow and “burn out” the lamp, while a lower voltage will not cause enough current flow. Electricity had been harnessed but no one knew how or why it worked.

This fact makes it possible to concen- trate flux lines where they are used or to bypass them around an area or instrument. This means that two magnetic North poles will repel each other as will two magnetic South poles, while a North pole and South pole will attract one another.

Because they are lightweight, portable, and can be set up for different voltage ranges by the flick of a switch, multi-range voltmeters are ex- tremely useful.