r

Found 14 Results for r.

Showing 1 to 10.

1. Pet Raising
James R. Kinney,* one of the greatest contemporary veterinarians, writes that "a dog is better off in the city than in the country.
http://www.fun-home-projects.com/hobbies/​pet_raising.html

2. Windows And Doors
A single pane of glass has an R value of about 1. So it loses about 12 times as much heat as the same area of properly insulated wall.
http://www.fun-home-projects.com/energy_savings/​windows_and_doors.html

3. What Is The "r" Value?
Insulation is now manufactured and sold by "resistance value*' (called the "R" value) — a precise measurement of the insulation's resistance to heat transfer.
http://www.fun-home-projects.com/energy_savings/​insulation/​what_is_the_quot_r_quot_value_.html

4. How To Insulate
Once you've decided on the R value you need, talk over your requirements with the dealer. He'll help you figure out the right number of bags or bundles of insulation.
http://www.fun-home-projects.com/energy_savings/​insulation/​how_to_insulate/​

5. Winter Savings
Before you start, find out how much insulation is in the building now, the R value you want, and the area to be insulated.
http://www.fun-home-projects.com/energy_savings/​tips_for_cottage_owners/​winter_savings.html

6. Inspecting A House
Hoffman; House Buying — The Practical Approach by R. Molnar; or Inspecting a House by A.
http://www.fun-home-projects.com/home_ownership/​purchasing_and_building/​inspecting_a_house/​

7. The Volt - Ohm - Milliammeter
The most widely used of all test instruments is the volt-ohm-milliammeter, more commonly known as the VOM. You won't find a repair shop without one. Of the VOM's three measurement functions, the ohmmeter circuit is most often used, since this is the one which can give an indication of continuity. The two selector switches on the face of the meter must be set properly to achieve accurate measurement. The left-hand selector switch designates the function (voltage, current, or resistance measurement), while the right-hand switch is used to select the range appropriate for the quantity being measured. When checking continuity, the function switch must be set in the ohms position, and the range should be set for one of the lower scales (R X 10). Since you are not after a precise resistance reading at this point, it is important only to have the range setting low enough to indicate when there is some internal resistance within motor-powered appliances (caused by the windings on the armature). Although you are not concerned with an accurate resistance measurement at this point, it is important that you "zero" the meter before making any continuity checks so that a shorted circuit will be apparent. To zero the meter, connect the test leads to their appropriate jacks on the face of the meter—plus is red and minus (common) is black—and while touching the leads together, adjust the zero control for a 0 reading on the ohms scale. If touching the leads together doesn't cause deflection of the blade indicator, or if the indicator won't adjust to a zero position, the meter battery is weak or making poor contact. Once you have zeroed the meter, you can begin checking for continuity. Since you want each check to be as informative as possible so that the problem can be quickly isolated, start by checking continuity through the power cord of the appliance. With the appliance power switch in the on position, apply the test leads to the prongs of the power plug (if the plug is three-prong, disregard the ground lug) and observe the meter indication. A good circuit should give a low reading on the ohms scale. A zero reading—maximum deflection—inicates that the circuit is shorted at some point. No deflection at all means that the circuit is open and will not permit current flow. Make sure that your appliance switch is on, however, before you make further checks. By gradually working your way through the circuitry you can easily locate the defective component or connection. The ohmmeter circuitry of the VOM is nothing more than a simple milliammeter circuit with a variable (zero control) resistor (Rz) and test-lead connecting points (X and Y) to introduce a resistor of unknown value into the circuit. When 10V is applied to the circuit, Rz should be of a value which can restrict current flow to 1 mA, or maximum meter deflection. We can determine this value by Ohm's law: R = E /1 = 10 / 0.001 = 10,000 ohms Allowing for internal resistance of the meter movement (roughly 1000 ohms), the formula indicates that Rz must be adjustable within the range of 9K ohms. Thus, any additional resistance introduced into the circuit will impede current flow even more and result in less than full deflection of the meter. Hence, what is basically a current indication reflects resistance values on the ohms scale.
http://www.fun-home-projects.com/electrical_projects/​tools/​the_volt_ohm_milliammeter.html

8. Diode / Triac Tester
For triacs, R (100 ohms) provides a gate current. When S2 is closed, 12 should light—this time with greater brilliance than the diode since it is conducting during both the positive and negative half-cycles.
http://www.fun-home-projects.com/electrical_projects/​tools/​diode_triac_tester.html

9. Hand - Held Dryer
Therefore, if a motor is slow, always aheck the dc voltage output of the rectif i r. The dc motor should have a resistance reading of 4 to 6 ohms—disconnected from the rectifier.
http://www.fun-home-projects.com/electrical_projects/​repairs/​hand_held_dryer.html

10. Home Manicure Kit
Now with the VOM set on R X 10 ohms range, trace the continuity of the primary circuit from one male prong of the cord set through the switch, through the transformer (95 ohms), the wire-nut connector, and out through the other male prong of cord set.
http://www.fun-home-projects.com/electrical_projects/​repairs/​home_manicure_kit.html


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