21/10/09

Resistance

Nichrome resists more the current than copper. nichrome has a bigger resistance than copper.

Every material has an electrical resistance .the greater the material’s resistance, the smaller is the is the current which flows through it.

Conductors like copper and aluminum have very low resistances. They carry large currents well .but insulators have very large currents well .but insulators have very large resistances. They only allow very small currents to flow through them.

When the current flows through a wire, electrical energy is changed to heat energy.

When a current is pushed through o hind resistance wire by a large voltage large amounts of heat are produced.