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.

Three resistors of 2 Ω is required to get 6 Ω because resultant is more than individual so they all must be connected in series.

In parallel combination, voltage remains same across two points

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

Ammeter at the times connected in series with in the circuit. The reading is independent from its location.

Q = ne and Q = It∴ ne = It

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.

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.

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.