Science : Ch 12 – Electricity

Ammeter is a device used for measuring electric current in amperes

Work done in transferring the charge W= qV = qlR …….. (V = IR)

In series, Rs = R1 + R2 = 10 Ω

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 resistivity does not change if the shape of resistor is changed because nature of material will remain same.

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.

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.

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.