Movements and Interactions: i got the answer as 1.5 kW is it right? question: if an electric drill transfers 180kj of energy over 2 mins to its motor, what is the power rating? i done : P(w) = E(j) / T(s) = 180 x 10^3 / 2 x 60 = 1500w = 1.5kW is that correct or have i done a mistake?

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas