Science : Ch 12 – Electricity

A short circuit is a low resistance connection between two conductors. With low resistance in the connection a high current is present which delivers a large amount of energy in a short time. Hence during a short circuit, the electric current in the circuit increases heavily.

The resistivity of a material is constant for a particular temperature at a constant temperature. Resistivity of material does not depend on length, thickness and shape of the material. It only depends on the temperature.

In parallel combination, voltage remains same across two points

In series, Rs = R1 + R2 = 10 Ω

Q = ne and Q = It∴ ne = It

The gap between conduction band and valence band is much greater than conductors which don't allow them to conduct electricity very easily which in result shows greater resistance, so insulators offer infinitely high resistance.

repulsion is noticed only when two bodies have like charges and this means that the bodies must be charged. Hence, repulsion is a true test of electrification

one horse power is determined as almost 746 Watt in standard calculations. It derived its name from the following context: One horsepower is the amount of power used by a horse to lift a 550 pounds heavy object from a depth of 1 foot in one second. This power when converted to SI system gives 746 Watts.