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Class 10 Class 12

Two cities are 150 km apart. electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 V and the average resistance per km is 8 V and the average resistance per km is . The power loss in the wire is,

• 19.2 W

• 19.2 kW

• 19.2 J

• 12.2 kW

B.

19.2 kW

Potential difference (drop) between two cities = 150 x 8 = 1200 V

Average resistance of total wire = 0.5 x 150 =
Power loss, P =
= 19.2 kW

Potential difference (drop) between two cities = 150 x 8 = 1200 V

Average resistance of total wire = 0.5 x 150 =
Power loss, P =
= 19.2 kW

742 Views

Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e. .

And dot product is a scalar quantity. Therefore, work is a scalar quantity.
1450 Views

Define watt.

Power is said to be one watt if one joule of work is done in one second.
860 Views

Define the unit joule.

Work done is said to be one joule if one newton of  force displaces the body through a distance of one meter in the direction of applied  force .
799 Views

What are different units of energy?

The different units of energy are :

(i) Joule
(ii) Erg
(iii) eV
(iv) KWh
(v) Calorie.

804 Views

What is watt?

SI unit of power is Watt.
773 Views