Make an electric circuit online - teacher information Index --- Introduction to electricity --- Voltage, Current, Resistance Go to make an electric circuit online: Introduction to electricity The Electric Circuit webpage was written for Primary School children, aged 7-11, although other ages may find it useful. The page does not measure current or voltage explicitly. Setting up the circuit To start with, you make a circuit by clicking on items, and putting them in the circuit by clicking on the grey part of the wire. This high-lights important facts about an electric circuit. Changing the circuit You can then change the circuit and observe the results. If you select a parallel circuit, you will get another circuit off the same battery. Components Battery - essential! The symbols are close to the official symbols. The two resistors are there to experiment with different values of current. How to use the webpage How you use the webpage is up to you. The Science Bit! Nothing will happen unless you have current flowing.
Simple Machines: Facts (Science Trek: Idaho Public Television) Once upon a time a person needed to move something heavy. He or she picked up a long stick and stuck it under the edge of the heavy object and then pushed down on the other end of the stick. And the first simple machine was invented. Simple machines are just that. There are 6 basic simple machines; the lever, the wheel and axle, the inclined plane, the wedge, the pulley, and the screw. But what is work? The Lever The lever is a long tool such as a pole or a rod put under an object to lift it. Levers are all around us. The Wheel & Axle The wheel has always been considered a major invention in the history of mankind. Wheels are found where things turn in a circle such as an electric fan, a motor, a revolving door, a merry go round, and any wheel — on the car, on your skateboard, or on a bicycle. The Inclined Plane The inclined plane is simply a ramp. Ramps are used in skateboard parks, wheelchair ramps and to get heavy equipment in and out of the back of trucks. The Wedge The Pulley The Screw
6 Simple Machines: Making Work Easier Throughout history, humans have developed a number of devices to make work easier. The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw and the wedge, although the latter three are actually just extensions or combinations of the first three. Because work is defined as force acting on an object in the direction of motion, a machine makes work easier to perform by accomplishing one or more of the following functions: transferring a force from one place to another, changing the direction of a force, increasing the magnitude of a force, or increasing the distance or speed of a force. Many machines combine more than one of these devices to make work easier. Wheel and axle The wheel is considered to be one of the most significant inventions in the history of the world. The wheel greatly reduces the friction encountered when an object is moved over a surface. Force multipliers Lever Inclined plane Pulley Screw
InventorsToolbox: The Elements of Machines Simple Machines: These devices were all in common use for centuries before Leonardo's time. Each one makes work easier to do by providing some trade-off between the force applied and the distance over which the force is applied. Wheel and Axle In this machine a wheel or spoke is locked to a central axle so that when one is turned the other must turn. A longer motion at the edge of the wheel is converted to a shorter more powerful motion at the axle. In reverse, a short powerful force at the axle will move the wheel's edge a greater distance. Pulley System A single pulley simply reverses the direction of a force. Wedge A wedge converts motion in one direction into a splitting motion that acts at right angles to the blade. Screw A screw is a central core with a thread or groove wrapped around it to form a helix. Lever A lever is a stiff rod that rotates around a pivot point. Gears Gears are toothed or pegged wheels meshed together to transmit motion and force.
Gear Generator Animation: * Shift + Enter: Set RPM of the selected gear #0 - N8 - ratio: 1:1 - RPM: 6#1 - N16 - ratio: 2:1 - RPM: 3#2 - N12 - ratio: 2:1 - RPM: 3#3 - N60 - ratio: 10:1 - RPM: 0.6 Connection properties Gear properties * Shift + Enter: modifies the Diametral pitch Download Display Units Gear Generator is unitless: if you wish it's inches, cm or millimeters. About Gear Generator is a tool for creating involute spur gears and download them in DXF or SVG format. Why this tool was created? Support: abel@iparigrafika.hu Notes about browser compatibility: all new major browsers are supported (i didn't tested IE), but unfortunately Chrome can't render SVG circle correctly. The downloaded DXF file can be opened with AutoCad 2013 or newer versions. Update 1.5: Fixed DXF resolution issue. Update 1.4: TA-DA: Added internal gear support, and the ability of positioning the first gear. Update 1.3: Fixed DXF file format. On YouTube Check out other tools I made:Print Charts, Flip.World, HTML Spirograph.