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.

Ammeter is a device used for measuring electric current in amperes

W= qV= 20000 × 10 = 2,00, 000 = 2 × 10⁵ J

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,

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

Ohm's law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

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.