material required
1.tongsten wire or nichrome wire
2.cell or battery
3.some wire
4.switch
5.some thumb pin or a pin
6.base of mud or clay
To build a room heater take pins and fit five pin i one side and another five at other side of the square base of mud of clay. conect the pins of one side with each other and same with other side. fit tongston or nichrome wire on one pin of one side and another pin to another side. do same with other pines.conect one wire of one side one pin.and same with other side. conect two wires to the cell.conect one wire of cell and the pine wire to the off switch.conect the other two wire with each other. the heater is ready.if you will switch on the heater after some second you will feel some heat. try it and keep it away from the childrens .explore some new things.
materials requied
1.a small motor and a fan
2.some wires
3. a cell or battery
4.a switch
take the motor and conect the fan and two wires to it.conect two wires to the cell like you had conected to the motor.take one wire of the motor and the cell conect them to the switch . conect the other two wires with each other.the circuit is ready .play with it and explore some new thing.
1.a tranformer
2. a cell
3. some wires
and to test it a bulb or led
to make the shocking circuit first take the transformer.conect the two wires of tranformer to the cell and another two wires to the bulb or someone you have to give shock the circuit is complete play with your circuit but do not try this on the childrens from 1 to 10 years.
Electrons with a negative charge, can't "jump" through the air to a positively charged atom. They have to wait until there is a link or bridge between the negative area and the positive area. We usually call this bridge a "circuit."
When a bridge is created, the electrons begin moving quickly. Depending on the resistance of the material making up the bridge, they try to get across as fast as they can. If you're not careful, too many electrons can go across at one time and destroy the "bridge" or the circuit, in the process.
In Chapter 3, we learned about electrons and the attraction between positive and negative charges. We also learned that we can create a bridge called a "circuit" between the charges.
We can limit the number of electrons crossing over the "circuit," by letting only a certain number through at a time. And we can make electricity do something for us while they are on their way. For example, we can "make" the electrons "heat" a filament in a bulb, causing it to glow and give off light.
When we limit the number of electrons that can cross over our circuit, we say we are giving it "resistance". We "resist" letting all the electrons through. This works something like a tollbooth on a freeway bridge. Copper wire is just one type of bridge we use in circuits.
Before electrons can move far, however, they can collide with one of the atoms along the way. This slows them down or even reverses their direction. As a result, they lose energy to the atoms. This energy appears as heat, and the scattering is a resistance to the current.
Think of the bridge as a garden hose. The current of electricity is the water flowing in the hose and the water pressure is the voltage of a circuit. The diameter of the hose is the determining factor for the resistance.
Current refers to the movement of charges. In an electrical circuit – electrons move from the negative pole to the positive. If you connected the positive pole of an electrical source to the negative pole, you create a circuit. This charge changes into electrical energy when the poles are connected in a circuit – similar to connecting the two poles on opposite ends of a battery.
Along the circuit you can have a light bulb and an on-off switch. The light bulb changes the electrical energy into light and heat energy.
