Some of you confuse about superconductors??? Do you know that ,with superconductors the equipments of electrical appliance no need batery or power source .
Kebanyakan logam tidak menunjukkan ciri ini. If a current flows in superconductors , the current still flows eventhough without power source.
Tuesday, March 2, 2010
Monday, March 1, 2010
Ini sebahagian jawapan kerja masa cuti hari raya cina
CONCEPTUALISING ANSWERS SCHEME
3.
1. Apparent weight in Diagram 9.1(c) > Diagram 9.1(b) // vise versa
2. Weight lost in Diagram 9.1(b) > Diagram 9.1(c) // vise versa
3. density of water > density of oil
4. The greater the density of liquid, the greater the weight lost / less apparent weight
5.
1. Density of air in Diagram (a) is higher than in Diagram (b).// vice versa
2. The number of load in Diagram (a) is greater than in Diagram (b)// vice versa
3. The height of the balloons in both Diagram (a) and Diagram (b) are equal
4. When the density of the air increase, the buoyant force increase
5. As the density of the air increase, the weight of the load carried increased// .
As the density of the air decrease, the weight of the load carried also decreased
7.
1. Density diagram (a) <> angle of refraction in diagram (b)
4. The higher the density the smaller the angle of refraction
5. The higher the refractive index the smaller the angle of refraction.
8.
1. Refractive index digram (b) larger than diagram (a)
2. Refraction angle diagram (b) is smaller than diagram (a)
3. Critical angle diagram (a) larger than diagram (b)
4. When the refractive index is large,
5. the critical angle is small
CONCEPTUALISING ANSWERS SCHEME
3.
1. Apparent weight in Diagram 9.1(c) > Diagram 9.1(b) // vise versa
2. Weight lost in Diagram 9.1(b) > Diagram 9.1(c) // vise versa
3. density of water > density of oil
4. The greater the density of liquid, the greater the weight lost / less apparent weight
5.
1. Density of air in Diagram (a) is higher than in Diagram (b).// vice versa
2. The number of load in Diagram (a) is greater than in Diagram (b)// vice versa
3. The height of the balloons in both Diagram (a) and Diagram (b) are equal
4. When the density of the air increase, the buoyant force increase
5. As the density of the air increase, the weight of the load carried increased// .
As the density of the air decrease, the weight of the load carried also decreased
7.
1. Density diagram (a) <> angle of refraction in diagram (b)
4. The higher the density the smaller the angle of refraction
5. The higher the refractive index the smaller the angle of refraction.
8.
1. Refractive index digram (b) larger than diagram (a)
2. Refraction angle diagram (b) is smaller than diagram (a)
3. Critical angle diagram (a) larger than diagram (b)
4. When the refractive index is large,
5. the critical angle is small
Thursday, February 25, 2010
don't confuse about resistance!!!!!
Why nichrome wire not , used in bulb???
Because the nichrome wire not heat up larger as tungsten wire. Tungsten wire suitable to build as filament in bulb , as the current increases the temperature rises and the resistance goes up. Its not obeys ohm's law. The resistance of a piece of nichrome increases by only about 1% for a 100 degree celcius. tungsten filament heats up to 3000 degree celcius. At this temperature, its resistance is about double then when cold. eventhough, Nichrome suitable used as heating elements in kettles,hairdryers.
Because the nichrome wire not heat up larger as tungsten wire. Tungsten wire suitable to build as filament in bulb , as the current increases the temperature rises and the resistance goes up. Its not obeys ohm's law. The resistance of a piece of nichrome increases by only about 1% for a 100 degree celcius. tungsten filament heats up to 3000 degree celcius. At this temperature, its resistance is about double then when cold. eventhough, Nichrome suitable used as heating elements in kettles,hairdryers.
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