Science : Ch 12 – Electricity

An ampere is the SI unit of electric current

Ammeter is a device used for measuring electric current in amperes

In parallel combination, voltage remains same across two points

The resistance of a bulb increases as the temperature of its filament increases

In order to get the working of heater properly, fused wire of higher rating must be used.

Total power used, P = P1 + P1 = 1500 + 500 = 2000 W.Current drawn from the supply,

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.

electrons move from low potential to high potential. Note: So, the end of high potential has more positive charges and the end of the battery with low potential has more negative charges. While the electric current flows from the high potential to the low potential.

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

Constant temperature makes the resistivity constant which made resistance constant. Constant resistance again made the Ohms law applicable. Thats why Ohms law is applied only at constant temperature. It is like the conditions apply of the law.

A kilowatt-hour is an amount of energy consumed by a machine working at a steady rate of one kilowatt for one hour. As a result, Joule is a SI unit of energy, but Kilowatt-hour is a Commercial unit.