Question Discussion & Solution

Flood is overflow of water. In the same way, drought is a continuous dry period of weather.

Total number of people = 45

Position of A from the behind = 26^th

Position of A from the front = Total number of people – A’s position from the behind + 1

= 45 – 26 + 1

= 20^th

Concept:

Resistance: The property of electrical materials and electrical instruments that opposes the flow of current through them is called resistance.

It is denoted by R. The SI unit of resistance is the ohm (Ω).

Power: The rate of work done by an electric current is called power. It is denoted by P. The SI unit of power is the watt (W).

Power dissipation (P) is given by:

\(P=VI=\frac{V^2}{R}=I^2R\)

Where V is the potential difference across resistance, I is current flowing and R is resistance.

Calculation:

With R = 50 Ω, and V = 220 V, the power required by the bulb will be:

\(P=\frac{V^2}{R}=\frac{220\times 220}{50}\)

P = 968 W

Keel, tiller and helm are the parts of a ship whereas fuselage is a part of aircraft.

Length is measured in Meter.

Similarly,

Power is measured in Watt.